Denver · DEN · Question
What Airlines Fly Out of DEN? Complete Airline List
Expert answer updated for 2026, with official sources and links to detailed guides.
Denver International Airport (DEN) is served by 11+ airlines, offering flights to domestic and international destinations. DEN is a hub airport for United Airlines and Southwest Airlines and Frontier Airlines, which means extensive route networks and frequent flights from these carriers.
All Airlines at DEN
- United Airlines
- Southwest Airlines
- Frontier Airlines
- American Airlines
- Delta Air Lines
- Spirit Airlines
- JetBlue
- Alaska Airlines
- British Airways
- Lufthansa
- Icelandair
Which Terminal Is Each Airline At?
Airlines at DEN are spread across 4 terminal areas. To find exactly which terminal, gates, and TSA checkpoint your airline uses, use our Terminal Finder tool — just select DEN and your airline for instant results.
You can also see the full terminal-by-terminal breakdown in our DEN airline directory, which includes gate ranges and hub badges.
Hub Airlines at DEN
United Airlines uses DEN as a hub, operating the most flights and typically occupying dedicated terminal space. Southwest Airlines uses DEN as a hub, operating the most flights and typically occupying dedicated terminal space. Frontier Airlines uses DEN as a hub, operating the most flights and typically occupying dedicated terminal space. Hub passengers benefit from more flight options, better lounge access, and stronger frequent flyer earning at their hub airport.
For detailed guides on individual airlines including baggage fees, loyalty programs, and check-in tips, visit our airline directory.