Airlines at Denver International Airport (DEN)
Denver, Colorado KDEN #4 US airport by passengers
Airlines operating at DEN, ranked by number of departures.
On-time performance at DEN
Based on 85,543 departures from May 2026 to July 2026. A flight counts as late when it leaves 15 or more minutes after schedule.
28.7%Departures late
23.5%Arrivals late
0.54%Cancelled
20.4 minAverage departure delay
| Airline | Departures | Late |
|---|---|---|
| United Airlines | 28,985 | 22.6% |
| Southwest Airlines | 23,801 | 46.2% |
| SkyWest Airlines | 19,366 | 20.2% |
| Frontier Airlines | 6,265 | 22.9% |
| Delta Air Lines | 3,182 | 18.3% |
| American Airlines | 2,435 | 29.7% |
| Alaska Airlines | 918 | 20.8% |
| JetBlue Airways | 388 | 38.7% |
| Allegiant Air | 166 | 23.5% |
Source: Bureau of Transportation Statistics, On-Time Performance of reporting carriers. Smaller regional carriers and some airlines are not included.
Airline presence
United Airlines operates a major hub here; Southwest Airlines and Frontier Airlines also have very large operations and are the other two big carriers by flights.