Denver Airport: Airlines Serving The Mile High City

what airlines sevive denver co airport

Denver International Airport (DEN) is one of the largest airports in the United States, serving metropolitan Denver, Colorado, as well as the greater Front Range Urban Corridor. The airport is a major hub for United Airlines and is the largest operating base for both Frontier Airlines and Southwest Airlines. Several other airlines serve DEN, including Delta Air Lines, JetBlue, Air Canada, and American Airlines. DEN offers a variety of shops, restaurants, and amenities to ensure a smooth and enjoyable travel experience for its passengers.

Characteristics Values
Airport Name Denver International Airport
Airport Code DEN
Location 25 miles (40 km) northeast of Downtown Denver
Airlines United Airlines, Frontier Airlines, Southwest Airlines, JetBlue, Delta Air Lines, Denver Air Connection, Air Canada
Amenities Shops, restaurants, parking facilities, shuttle services, train services
Terminals 1 (Jeppesen Terminal)
Concourses 3 (A, B, C)
Gates 169

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United Airlines is the major hub at Denver International Airport

Denver International Airport (DEN) is a major hub for United Airlines, which is the airport's biggest operator. The airline has recently invested nearly $1 billion in Denver to add more gates, flights and destinations, and it has opened the largest lounge in its network. United Airlines is also Denver International Airport's busiest hub by flights and seats, with an average of 894 daily movements from January to March 2024.

United Airlines has a significant presence at Denver International Airport, with two United Club locations. The airline offers convenient connections to the airport, with the RTD Train Line A connecting downtown's Union Station to the airport every 15 minutes. The ride takes less than 40 minutes, providing a fast and efficient travel experience for passengers.

Denver International Airport itself is an impressive aviation hub, boasting the longest public-use runway in North America. With a length of 16,000 feet, it is the seventh-longest runway on Earth. The airport covers a vast area of 33,531 acres, making it the largest airport in the Western Hemisphere by land area and the second-largest worldwide.

Denver International Airport serves a high volume of passengers, ranking as the third busiest airport in the world in 2021, 2022, and 2024. In 2023, it was the sixth busiest airport globally and the third busiest in the United States, serving approximately 77.8 million passengers. The airport's high passenger traffic underscores the importance of United Airlines' hub at this dynamic aviation gateway.

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Southwest Airlines is the second-largest carrier at the airport

Southwest Airlines is the second-largest carrier at Denver International Airport (DEN) in Colorado. The airline first served the airport from 1983 to 1986, operating flights to and from the original Denver airport, Stapleton International Airport. In 2006, Southwest Airlines re-entered the market, this time serving the new Denver International Airport, which had replaced Stapleton in 1995. The airline's return to Denver was marked by 13 daily flights to three cities: Las Vegas, Phoenix, and Chicago.

Southwest Airlines has since expanded rapidly and now occupies 34 gates at DEN's Concourse C, with nearly 250 daily departures to 92 destinations. This includes 16 new gates that were added to Concourse C in 2020, bringing the total number of gates at this concourse to 40, the largest gate count for Southwest Airlines at any single airport.

Denver International Airport is a significant hub for Southwest Airlines, serving as a major connection point for both connecting and originating passengers. The airline's focus on Denver can be attributed to the city's role as a gateway to the Rockies and the West Coast. The carrier's commitment to the city is further demonstrated by its investment in a $100 million maintenance hangar at the airport and its long-term presence, with a crew domicile for pilots and flight attendants established in 2012.

While United Airlines remains the largest carrier at Denver International Airport, Southwest Airlines' expansion and investment in the city have solidified its position as the second-largest carrier, contributing to the airport's ranking as one of the busiest in the world.

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The airport is the largest operating base for Frontier Airlines

Denver International Airport (DEN) is the largest operating base for Frontier Airlines. The airport is located 25 miles (40 km) northeast of Downtown Denver and primarily serves metropolitan Denver, Colorado, as well as the greater Front Range Urban Corridor. It is the second-largest airport in the world by land area, covering 33,531 acres (52.4 sq mi; 135.7 km2).

Frontier Airlines is headquartered in Denver, Colorado and operates flights to over 120 destinations across the United States, the Caribbean, Mexico, and Central America. The airline employs more than 5,000 staff and maintains bases at several airports across the United States and Puerto Rico, including Denver International Airport, Orlando International Airport, and Trenton–Mercer Airport.

Frontier Airlines operates out of Terminal East at Denver International Airport, which caters to both domestic and international flights. This terminal offers a range of services and lounges to enhance the travel experience, including comfortable seating, complimentary refreshments, and business facilities. The airline is known for its excellent customer service and modern fleet, and its terminal is well-organized and easy to navigate.

Denver International Airport is a major hub for several airlines, including United Airlines, Southwest Airlines, and Frontier Airlines. The airport has been one of the busiest airports in the world, ranking third in 2021, 2022, and 2024 by passenger traffic. In 2024, the airport set a record by serving 82,358,744 passengers. The airport offers various amenities, shops, restaurants, and convenient transportation options, including the A Line rail service connecting the airport to downtown Denver.

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Delta Air Lines operates from Concourse A

Denver International Airport (DEN) is a bustling hub of activity, offering a seamless travel experience with its array of amenities, shops, and restaurants. The airport, located 25 miles (40km) northeast of Downtown Denver, is the largest airport in the Western Hemisphere by land area. With ongoing renovations, DEN is committed to enhancing the efficiency and comfort of passengers' journeys.

Among the many airlines serving Denver International Airport, Delta Air Lines is a prominent carrier. Delta Air Lines operates from Concourse A, which is conveniently accessible via a pedestrian bridge directly from the Jeppesen Terminal, the main terminal building at DEN. This concourse also facilitates all international arrivals without border pre-clearance and boasts four 3-jetway international gates capable of accommodating the two largest commercial aircraft in the world: the Airbus A380 and the Boeing 747-8.

Delta Air Lines offers a range of daily flights to and from Denver, connecting the city with various destinations across the United States. These destinations include major cities such as Atlanta (ATL), Boston (BOS), Detroit (DTW), Los Angeles (LAX), Minneapolis (MSP), New York (JFK), Salt Lake City (SLC), and Seattle (SEA). The airline's presence at Concourse A allows for efficient passenger movement and contributes to the overall convenience of travelling through DEN.

In addition to Delta Air Lines, Concourse A is also shared by other notable airlines, including Frontier Airlines, JetBlue, and United Airlines. The concourse is designed to handle a high volume of passenger traffic, with the Jeppesen Terminal and Concourse A collectively offering 169 gates as of early 2025. This efficient layout ensures a smooth flow of travellers, even during peak times.

Passengers travelling with Delta Air Lines or any other airline operating from Concourse A should be aware of ongoing construction work at DEN. Until mid-2027, 24 airline check-in and bag drop counters will be temporarily relocated from Level 6 to Level 5 within the Jeppesen Terminal. This temporary arrangement is part of the airport's Great Hall Program, aimed at enhancing the overall travel experience and aligning with the culture of Colorado.

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Denver Air Connection is a subsidiary of Key Lime Air

Denver International Airport (DEN) is one of the busiest airports in the world, serving as a hub for several airlines. One of the airlines serving the Denver, Colorado region is Denver Air Connection, a subsidiary of Key Lime Air.

Denver Air Connection, operating as DAC, provides both charter and scheduled passenger air services. It offers scheduled routes between 16 cities across 10 states, utilising a range of aircraft, including Embraer ERJ-145 and Fairchild Dornier 328JET regional jets, as well as Fairchild Swearingen Metroliner and Embraer EMB-120 Brasilia turboprops. The airline commenced its first Essential Air Service (EAS) contract at Alliance Municipal Airport in 2019, providing 12 weekly round trips to Denver. Additionally, Denver Air Connection has an interline relationship with major airlines like United, American, and Delta, allowing travellers to connect to these partner airlines seamlessly without the hassle of rechecking baggage.

Key Lime Air, the parent company of Denver Air Connection, operates a diverse fleet of over 25 aircraft, flying more than 10,000 hours annually. The company provides charter and cargo services throughout the United States, Canada, Mexico, the Caribbean, and South America. Key Lime Air is committed to excellence and safety, ensuring stringent operational and maintenance programs. Their team is available 24/7, offering aircraft accommodating up to 30 passengers or 4,500 lbs to meet various client needs.

Denver Air Connection is proud to offer unique services, including free king-sized snacks and beverages on their flights. They provide daily flights to Cortez via Denver and Phoenix and seasonal flights to Telluride during winter and summer, also via Denver and Phoenix. The airline's website provides convenient access to flight bookings and information, ensuring a smooth travel experience for its passengers.

Denver Air Connection, as a subsidiary of Key Lime Air, plays a vital role in connecting the Denver region with the rest of the world, offering reliable and on-time flights to various destinations. Through its partnership with Key Lime Air, Denver Air Connection benefits from a larger fleet and a dedicated focus on safety and customer satisfaction.

Frequently asked questions

DEN is the IATA code for Denver International Airport.

At 33,531 acres (52.4 sq mi; 135.7 km2), it is the largest airport in the Western Hemisphere by land area and the second-largest on Earth.

Denver International Airport is a major hub for United Airlines, the largest base for Southwest Airlines, and the largest operating base for Frontier Airlines.

Denver International Airport has one terminal, the Jeppesen Terminal, with three midfield concourses. It is located 25 miles (40 km) northeast of Downtown Denver and features shops, restaurants, and amenities for travellers.

Some airlines that serve Denver International Airport include Delta Air Lines, JetBlue, United Airlines, and Frontier Airlines.

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