Airlines at Washington Dulles International Airport (IAD)
Dulles, Virginia KIAD #22 US airport by passengers
Airlines operating at IAD, ranked by number of departures.
On-time performance at IAD
Based on 15,785 departures from May 2026 to July 2026. A flight counts as late when it leaves 15 or more minutes after schedule.
18.1%Departures late
18.0%Arrivals late
1.53%Cancelled
18.3 minAverage departure delay
| Airline | Departures | Late |
|---|---|---|
| United Airlines | 9,896 | 16.9% |
| Republic Airways | 2,260 | 15.9% |
| Delta Air Lines | 912 | 18.8% |
| SkyWest Airlines | 742 | 18.6% |
| Frontier Airlines | 576 | 29.5% |
| American Airlines | 522 | 27.8% |
| Alaska Airlines | 363 | 19.3% |
| PSA Airlines | 215 | 16.7% |
| Allegiant Air | 197 | 29.4% |
| Southwest Airlines | 102 | 40.2% |
Source: Bureau of Transportation Statistics, On-Time Performance of reporting carriers. Smaller regional carriers and some airlines are not included.
Airline presence
United Airlines is the dominant carrier, with a major hub here. Many international airlines and several low-cost carriers also operate from the airport.