Your Guide to the 10 Best Airlines to Denver in 2025

Thinking about a trip to Denver? With its vibrant downtown, mountain views, and easy access to the Rockies, Denver is the perfect blend of city energy and outdoor adventure. I’ve flown to Denver multiple times over the years, always finding ways to keep costs low while still enjoying a smooth travel experience.

For this guide, I analyzed flights from 200 airports across the US to highlight the top 10 airlines for flying to Denver in 2025. These airlines excel in budget-friendly fares, frequent schedules, and in-flight comfort. Whether you’re coming for world-class skiing, stunning national parks, or Denver’s foodie scene, this list has you covered with the best options for getting there affordably and comfortably. Let’s dive into the top airlines to start your Denver adventure on the right foot!

Quick tip to find cheap flights to Denver

For the past 4 years, I’ve used Scott’s Cheap Flights (now called Going) to get amazing flight deals. All you have to do is enter your home airport and where you want to go, and from there, they’ll send you mistake fares and other ridiculously cheap flight deals. And the coolest part? It’s 100% FREE! In 2024, I’ve saved thousands of dollars from their email alerts. This includes most recently, a $155 roundtrip fare from Boston to Denver.

There’s a free and a premium version – the free one has pretty much everything you’ll need. Though if you’re like me and travel a lot every year, it’s worth upgrading to the paid version for $49 per year. In my experience, you’ll get your money back after finding just one discounted flight! As such, I recommend signing up for the free trial (you can cancel at any time) to try it for yourself. And if you like it, be sure to use my coupon code JON20 to save 20%!

Now without further ado, here are the best Denver flights in 2025.

1. Delta

Delta Air Lines has carved a niche for itself in the aviation sector. Today, it’s a top choice for business and leisure travelers. For those plotting their next adventure and seeking the best airlines to fly into Denver, Delta’s reputation for comfort, punctuality, and top-tier service is hard to bypass.

Every journey with Delta is meticulously crafted to cater to the diverse needs of its passengers. The airline boasts a range of seating options, ensuring every traveler finds their perfect fit. The luxury of Delta One, with its lie-flat seats and premium dining, appeals to those who crave opulence in the skies. Meanwhile, the Main Cabin offers affordability without compromising on comfort. It’s also ideal for families and budget travelers.

Speaking of families, Delta’s kid-friendly amenities, from special meals to entertainment options, ensure young travelers are well taken care of. Furthermore, business travelers aren’t left behind either. With in-flight Wi-Fi, power outlets, and a serene environment, they can work on the go, making the most of their travel time.

Delta’s extensive network, with its significant presence in major airports, including its primary hub in Atlanta, ensures Denver is never too far away. Regular flights, combined with competitive fares, make the journey to the “Mile-High City” smooth and economical.

Delta’s appeal spans a broad spectrum of travelers. From solo adventurers to corporate giants, from families on vacation to couples on romantic getaways, Delta has something for everyone. Its commitment to excellence and vast offerings make it a frontrunner for anyone looking for flights to Denver.

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2. Southwest

Southwest Airlines, with its vibrant heart logo and friendly vibes, has long been a favorite among travelers seeking affordability with top service. If you’re on the hunt for the best airlines to travel to Denver without breaking the bank, Southwest might just be your ticket to a fantastic journey.

While many budget airlines charge for every extra, Southwest offers two free checked bags – a rarity in today’s age of nickel-and-diming. This perk alone can save travelers a significant amount, especially those embarking on longer trips or family vacations.

However, with budget-friendly fares come certain considerations. While Southwest doesn’t have the hidden fees many budget airlines are notorious for, travelers should be aware of the airline’s open seating policy. There are no assigned seats. Instead, passengers are grouped into boarding categories and choose their seats as they board. This means if you’re keen on a window or aisle spot, it’s wise to check in exactly 24 hours before your flight or consider paying a bit extra for early boarding.

Southwest’s hub in Denver means frequent flights and a plethora of time options for travelers. The airline often rolls out fare sales, so those flexible with their dates might snag an unbeatable deal. Plus, the airline’s Rapid Rewards program offers a way for frequent fliers to earn points towards future travels.

In the realm of budget airlines, Southwest shines brightly. Its transparent pricing model, devoid of hidden fees, sets it apart in an industry often riddled with surprises. With a strong flight network centered around Denver and a loyalty program that rewards frequent fliers, Southwest ensures that every journey is a delightful experience tailored to the traveler.

3. United

United Airlines, one of the world’s largest carriers, offers a blend of both extensive global connectivity and premium services. For travelers wondering about the best international airlines to Denver, United emerges as a top contender. It also seamlessly connecting the “Mile-High City” to destinations across continents.

What sets United apart is its vast international network. While Delta and Southwest have a strong domestic presence, United’s strength lies in its global reach. Whether you’re jetting in from Tokyo, hopping over from London, or making your way from Sydney, United has you covered. This extensive network makes it a favorite for international travelers and business professionals who need reliable and frequent connections to global hubs.

Onboard, United offers a range of cabin experiences tailored to different traveler needs. From the luxury of Polaris Business Class, with its lie-flat seats and gourmet dining, to the value-driven Economy Plus with extra legroom, there’s an option for every budget and preference. United’s in-flight entertainment system, loaded with the latest movies, shows, and music, ensures hours fly by in a blink.

Another distinguishing feature is United’s MileagePlus program. While many airlines offer loyalty programs, MileagePlus stands out for its generous rewards, exclusive experiences, and the ability to redeem miles beyond just flights, including hotel stays and car rentals.

Overall, United Airlines offers a travel experience that’s both global and grand. For those who value international connectivity, premium onboard services, and a rewarding loyalty program, United might just be the perfect airline for your Denver escapade. It’s the best airline to Denver by far, especially if you’re coming from the East Coast.

4. American Airlines

In the vast skies of airline choices, American Airlines, often dubbed “AA,” emerges as a beacon for those who value a seamless blend of both tradition and innovation. If Denver’s allure beckons and you’re sifting through the best airlines from the US to Denver, here’s why AA might just be your perfect match.

For the discerning traveler who values direct routes, AA’s unparalleled domestic connectivity is a game-changer. While other airlines might offer a plethora of international connections, AA shines in ensuring that no corner of the U.S. feels too distant from Denver. This extensive network, coupled with a commitment to punctuality, makes it an ideal choice for those who prioritize efficient, direct routes and timely arrivals.

For the loyalty-driven traveler, the AAdvantage program is a gateway to exclusive experiences. With lucrative rewards, an extensive partner network, and benefits that extend beyond just flights, AAdvantage members often find their loyalty rewarded in ways that other airline programs might not match.

To sum it up, American Airlines is tailored for those who seek a travel experience where every detail, from route efficiency to onboard comforts, is meticulously crafted. Did you know that AA was the first major airline to introduce a computerized flight reservation system? This pioneering spirit continues to drive their commitment to both passenger convenience and innovation. With American Airlines, your flight to Denver becomes a delightful blend of history, innovation, and unparalleled service.

5. Air France

Imagine a journey that blends the sophistication of Parisian streets with the adventurous allure of Denver’s Rockies. With Air France, this dream becomes a reality. As the flag carrier of France and a luminary in European aviation, Air France offers travelers an experience that’s both luxurious and efficient. Hands down, it’s one of the best airlines to travel to Denver from Europe.

Air France’s commitment to excellence is evident in its modern fleet. Every aircraft, from the majestic Airbus A350 to the nimble A320, is equipped with the latest in aviation technology. This ensures not only a safe journey but also one marked by both comfort and entertainment. The airline’s in-flight offerings, from gourmet French cuisine to an extensive entertainment system, reflect its dedication to passenger satisfaction.

Direct flights to Denver from Paris and other major European cities are Air France’s forte. This direct connectivity, complemented by the airline’s primary hub at the iconic Charles de Gaulle Airport, ensures European travelers enjoy a hassle-free journey to the heart of America.

What truly sets Air France apart is its attention to detail. The airline’s La Première services offer an unparalleled luxury experience, from exclusive lounges to personalized onboard service. Moreover, the Flying Blue loyalty program rewards frequent travelers with a range of benefits, from priority boarding to exclusive deals.

Wrapping up the Air France experience, it’s like stepping into a world where European sophistication meets the adventurous spirit of Denver. With its commitment to passenger satisfaction, Air France emerges as a top choice when considering the best airlines that fly to Denver, offering an unparalleled travel experience.

6. Air Canada

Air Canada, the flag carrier of our northern neighbor, stands as a testament to both Canadian hospitality and efficiency. If you’re searching for the best international airlines to Denver, especially from Canadian cities, Air Canada emerges as a top choice. This airline connects Denver to various Canadian hubs.

One of the standout features of Air Canada is its commitment to passenger comfort. The airline’s fleet, equipped with the latest in aviation technology, ensures a smooth and quiet ride. Whether you’re seated in the expansive Business Class with lie-flat seats or in the well-appointed Economy Class, every seat promises a journey marked by both relaxation and attentive service.

Denver, with its mountainous allure, is easily accessible via Air Canada’s extensive network. Regular flights from major Canadian cities like Toronto, Vancouver, and Montreal make the journey to Denver a breeze. This connectivity is further enhanced by Air Canada’s hub at Toronto Pearson International Airport, one of North America‘s leading air transport gateways.

Moreover, Air Canada offers a range of unique services that set it apart. The airline’s Maple Leaf Lounges, available at select airports, provide a serene escape from the usual airport hustle. Here, travelers can relax, work, or dine before their flight. Additionally, the Aeroplan loyalty program offers frequent fliers a chance to earn and redeem miles, enhancing the overall travel experience.

Air Canada bridges the gap between the snowy landscapes of Canada and the rugged beauty of Denver. With its modern fleet, extensive network, and a touch of Canadian warmth, Air Canada ensures your best flight to Denver is filled with pleasant memories.

7. Frontier

With distinctive wildlife-themed aircraft tails soaring through the skies, Frontier Airlines stands as Denver’s hometown hero in aviation. For those weighing up the best airlines to fly into Denver without breaking the bank, Frontier presents a compelling argument, especially when stacked against other budget contenders like Southwest.

Frontier’s edge comes from its deep-rooted focus on Denver. Its main hub is strategically located at Denver International Airport, offering travelers frequent flights, a variety of timing options, and often, hard-to-resist deals. This hometown advantage often means quicker turnaround times and fewer delays, especially during peak travel seasons.

However, as is the case with many budget airlines, there are nuances to be aware of. Frontier operates on an à la carte pricing model. While the base fares can be low, added services such as seat selection, carry-on baggage, and in-flight meals come with an extra price tag. It’s crucial to consider these additional costs when comparing ticket prices. Checking in online is free, but there might be a fee if done at the airport. Pre-ordering meals can be a wallet-friendly move compared to onboard purchases, and being savvy about baggage allowances can save you from surprise charges.

While both Frontier and Southwest offer budget-friendly fares, Frontier’s strong ties to Denver and its frequent promotions, especially for Frontier Miles program members, often give it a competitive edge. For those who prioritize direct routes and minimal layovers, Frontier’s expansive network from its Denver hub is a significant advantage.

Overall, Frontier Airlines seamlessly combines affordability with convenience, especially for Denver loyalists.

8. Icelandair

Looking to fly to Denver from Europe? Icelandair offers a journey like no other. If you’re exploring the best airlines to travel to Denver and are open to a scenic detour, Icelandair beckons with the promise of the dramatic landscapes of Iceland.

One of Icelandair’s standout features is its “Stopover” program. Instead of a hurried layover, travelers can opt for a stopover in Iceland for up to seven days at no additional airfare. This unique offering allows passengers to break their journey, explore the geysers, waterfalls, and the Northern Lights of Iceland, and then continue to Denver refreshed and with memories of an added adventure.

Icelandair’s frequency of flights ensures flexibility for travelers. With regular connections from major European cities to Denver via Reykjavik, passengers have many options to choose from. This frequent service, combined with the airline’s commitment to punctuality, ensures a smooth and timely journey.

Onboard, Icelandair offers a distinctive Nordic experience. The cabins, inspired by the Icelandic landscapes, provide a serene and comfortable environment. In-flight entertainment boasts a selection of Icelandic music and films, giving passengers a taste of the country’s rich culture.

Icelandair prides itself on operating a modern fleet. This ensures that passengers experience the latest in both aviation comfort and technology. For its Reykjavik to Denver flight, the airline predominantly uses the Boeing 757-200, a reliable and efficient aircraft known for its extended range. These aircraft are designed with passenger comfort in mind, featuring spacious cabins, ergonomic seating, and advanced in-flight entertainment systems.

Icelandair offers an invitation to experience the magic of Iceland on your way to Denver. With its unique stopover program, frequent flights, and a touch of Icelandic charm, your journey transforms into a tale of two captivating destinations.

9. British Airways

When UK travelers dream of Denver’s majestic landscapes, British Airways often comes to mind as their trusted bridge across the Atlantic. As the UK’s flag carrier, this airline has consistently ranked among the best airlines to travel to Denver for those hailing from British shores.

The airline’s extensive network and flight frequency are commendable. Direct flights from London Heathrow to Denver International Airport are a testament to its commitment to connecting the UK to key destinations in the US. This direct route is a significant advantage, especially for travelers who prefer a straightforward journey without the fuss of multiple layovers.

Every flight with British Airways promises an experience of both comfort and luxury. Whether you’re reclining in the spacious seats of Club World (Business Class) or enjoying the curated entertainment in World Traveller (Economy), the airline ensures a journey marked by quality and attention to detail.

A standout feature of British Airways is its holistic approach to travel. The Executive Club, its frequent flyer program, not only rewards loyalty but also enhances the travel experience with benefits like priority boarding and access to exclusive lounges. And for those looking to venture beyond Denver, British Airways’ strategic partnerships with American carriers facilitate smooth connections. This makes it a top choice when pondering what airlines fly to Denver from international destinations.

In conclusion, for UK travelers with Denver on their radar, British Airways offers a blend of convenience, luxury, and reliability, turning every trip into a cherished memory.

10. Lufthansa

Picture this: A journey that marries German precision with the wild spirit of Denver. That’s the Lufthansa experience in a nutshell. As one of Europe’s best airlines, Lufthansa has carved a niche for itself among travelers seeking a blend of luxury, efficiency, and a touch of European flair. If you’re scouting for the best airlines to fly to Denver, Lufthansa should be high on your list.

Originating from its hubs in Frankfurt and Munich, Lufthansa offers frequent flights to Denver. As a result, the Rocky Mountains are just a comfortable flight away for European travelers. And it’s not just about getting you there; it’s about making the journey memorable. From gourmet meals inspired by world-class chefs to an in-flight entertainment system that rivals a mini-cinema, Lufthansa goes the extra mile, quite literally.

But what truly makes Lufthansa shine brighter than its counterparts? It’s the airline’s commitment to passenger comfort. The spacious seating, even in economy, feels like a luxury. And for those willing to splurge a bit, the First Class and Business Class cabins are nothing short of a flying palace.

Best flight to Denver? With Lufthansa, it’s not just about the destination. It’s about cherishing every moment of the journey. As you soar above the clouds, with the Alps fading in the distance and the Rockies beckoning ahead, Lufthansa ensures that every mile is a memory in the making.

On a personal note, having flown Lufthansa on several occasions, I can vouch for both its impeccable service and quality. It’s an airline that truly understands the essence of a delightful travel experience.

Frequently Asked Questions (FAQs) about Best Airlines to Fly to Denver

If you’re still curious about what airlines fly to Denver, here are some common questions that might help you decide.

What is the main airline for Denver, Colorado?

Denver International Airport serves as a hub for several airlines, but Frontier Airlines stands out as Denver’s hometown hero. With its main hub situated in Denver, Frontier offers frequent flights, a plethora of timing options, and often, unbeatable deals for travelers.

How do you get to Denver from the UK?

For travelers looking for flights to Denver from the UK, there are several options to consider:

1. Direct Flights: British Airways offers direct flights from London Heathrow to Denver, providing a straightforward and efficient journey.
2. One-stop Flights: Airlines like Lufthansa and Icelandair offer one-stop flights with layovers in cities like Frankfurt or Reykjavik, respectively. These can sometimes be more affordable and offer a chance for a mini-vacation in the layover city.
3. Multiple Airlines: Consider booking legs of your journey with different airlines. For instance, fly to a major European hub with one airline and then catch a direct flight to Denver with another.

What is the cheapest time to fly to Denver?

The off-peak seasons, particularly late spring (April to early June) and early fall (September to early November), tend to offer the most affordable fares. During these times, you can enjoy the beauty of Denver without the tourist crowds and with the added bonus of cheaper flight tickets.

It is at these times where accommodations in Denver offer great deals. Central Business District, for example, is close to major attractions and offers a range of Denver hotels from luxury to budget-friendly.

The best part? With a little bit of research and flexibility, you can find amazing deals on the cheapest places to fly from Denver. From the sunny beaches of Orlando to the world-famous casinos of Las Vegas, the cheapest vacations from Denver include some of the most popular tourist spots in the continental US.

Does Delta fly direct from London to Denver?

As of the last update, Delta does not operate direct flights from London to Denver. However, they do offer flights with connections in their major hubs, such as Atlanta or Minneapolis.

Which airline is better to fly to Denver: United or Delta?

Both airlines have their strengths, but here’s a comparison to help you decide which airline to fly to Denver:

• United:
  • Main hub in Denver, ensuring frequent flights and more timing options.
  • Offers a range of cabin classes, from basic economy to Polaris Business.
  • Strong domestic network for onward connections from Denver.
    
• Delta:
  • Known for its excellent in-flight service and amenities.
  • Operates modern and comfortable aircraft.
  • Offers the SkyMiles program, which can be lucrative for frequent flyers.

What is the most popular airline in Denver?

United Airlines is the most popular airline in Denver in terms of the total number of flights and overall presence. It has expanded its role as Denver’s most flown airline, adding more flights, routes, and gates in 2025.

Denver-based Frontier Airlines, on the other hand, also has a significant presence in Denver. Though due to its reputation as a budget airline, it rarely ranks in any best airline lists.

How can I find cheap flights to Denver?

Finding affordable flights to Denver requires a mix of strategy and luck. Here are ten tips to help you snag a deal:

1. Flexibility: Be flexible with your travel dates. Mid-week flights often tend to be cheaper.
2. Use Incognito Mode: When searching for flights, use incognito mode to avoid price hikes based on your browsing history.
3. Flight Comparison Websites: Use platforms like Skyscanner or Kayak to compare fares across various airlines.
4. Set Fare Alerts: Websites like Google Flights allow you to set fare alerts for specific routes.
5. Book in Advance: While last-minute deals can be found, booking a few months in advance often yields better prices.
6. Consider Nearby Airports: Sometimes flying into a nearby airport and then taking ground transport can be cheaper.
7. Use Airline Miles: If you have accumulated airline miles, consider using them to offset the cost.
8. Travel Light: Some airlines offer cheaper fares if you don’t check in luggage.
9. Off-Peak Hours: Flights during off-peak hours, like early morning or late night, might be more affordable.
10. Subscribe to Newsletters: Consider subscribing to newsletters like Going (formerly Scott’s Cheap Flights). They also alert subscribers to flight deals and error fares.

What airlines have Denver as a hub?

Denver International Airport (DEN) serves as a hub for the following airlines:

1. United Airlines – Denver International Airport (DEN) is one of the major hubs for United Airlines.
2. Southwest Airlines – While Southwest doesn’t traditionally use the term “hub,” Denver International Airport (DEN) is one of their significant operating bases.

These airlines have a substantial presence at Denver International Airport, offering numerous routes and frequent flights. If you’re flying in or out of Denver, these airlines provide a wide range of options for both domestic and international destinations. Safe travels!

Final Thoughts on the Best Airlines to Fly to Denver, CO

Denver, with its majestic Rocky Mountains and vibrant urban scene, beckons travelers from all corners of the globe. Choosing the right airline to Denver can make all the difference in starting your adventure on the right foot. From the luxury of British Airways to the budget-friendly options of Frontier, there’s an airline tailored to every traveler’s needs and preferences.

For those on the hunt for the best deals, staying vigilant is also key. Subscribing to newsletters, setting fare alerts, and being flexible with travel dates can lead to significant savings. Remember, the journey to Denver isn’t just about reaching the destination; it’s also bout the entire flying experience. The right airline can offer comfort, entertainment, and a taste of what awaits in the Mile-High City, even before you land.

In the ever-evolving world of travel, staying informed and open to new options can unlock doors to incredible experiences. Denver awaits, and with the insights from this guide, you’re well-equipped to make an informed choice. This ensures your trip is memorable from takeoff to touchdown.