Washington Dulles International Airport (IAD) delays & on-time performance
Washington, Virginia · 78 nonstop destinations · 10 airlines · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
On-time arrivals
81%
arrived < 15 min late
Cancelled
1.4%
814 flights
Avg arrival delay
15 min
78 min when late
Departed on time
84%
avg taxi-out 22 min
Figures cover 58,031 departures from IAD; on-time is measured at arrival. Arrivals into IAD were on time 83% of the time.
Key facts
- Flights departing Washington Dulles International Airport (IAD) arrived on time 81% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.4% were cancelled, and 7% arrived an hour or more late.
- United Airlines was the most punctual airline here (83% on time); SkyWest Airlines was the least (80%).
- Departures scheduled around 9am did best (90% on time); around 6pm did worst (71%).
- The largest source of delay minutes was late-arriving aircraft (33%).
Most delayed routes from IAD
Lowest on-time arrival rates among regularly flown routes.
- MGW · Morgantown74%362 flts
- LGA · New York74%999 flts
- ORD · Chicago75%2,085 flts
- SJU · San Juan76%707 flts
- EWR · Newark76%1,532 flts
- BOS · Boston77%1,514 flts
- DFW · Dallas/Fort Worth77%1,951 flts
- DTW · Detroit78%1,133 flts
- SEA · Seattle78%1,851 flts
- ATL · Atlanta79%3,989 flts
Most reliable routes from IAD
Highest on-time arrival rates among regularly flown routes.
- PWM · Portland88%787 flts
- RSW · Fort Myers87%468 flts
- CHS · Charleston87%760 flts
- BDL · Hartford86%1,077 flts
- MSY · New Orleans86%631 flts
- SAT · San Antonio86%641 flts
- BTV · Burlington86%500 flts
- LAS · Las Vegas86%1,077 flts
- MSP · Minneapolis85%983 flts
- AUS · Austin85%1,042 flts
Best airline at IAD
Departures from this airport, ranked by on-time arrival.
| Airline | On time | Cancelled | Avg delay | Routes | Flights |
|---|---|---|---|---|---|
| PSA Airlines | 85% | 3.1% | 17 min | 1 | 978 |
| United Airlines | 83% | 0.9% | 14 min | 60 | 36,755 |
| Republic Airways | 82% | 2.7% | 14 min | 39 | 8,800 |
| Delta Air Lines | 81% | 2.5% | 19 min | 5 | 3,098 |
| SkyWest Airlines | 80% | 2.1% | 30 min | 6 | 2,475 |
| American Airlines | 78% | 2.5% | 22 min | 3 | 1,465 |
| Southwest Airlines | 76% | 0.8% | 14 min | 3 | 985 |
| Alaska Airlines | 75% | 1.0% | 13 min | 4 | 1,253 |
| Allegiant Air | 74% | 0.7% | 27 min | 9 | 570 |
| Frontier Airlines | 70% | 2.3% | 29 min | 9 | 1,652 |
Best time to fly out of IAD
On-time arrival rate by scheduled departure hour (local time).
- 6am88%3,338 flts
- 7am82%1,720 flts
- 8am88%10,523 flts
- 9am90%2,840 flts
- 10am87%915 flts
- 11am86%633 flts
- 12pm84%8,355 flts
- 1pm82%2,297 flts
- 2pm81%955 flts
- 3pm78%1,609 flts
- 4pm79%1,005 flts
- 5pm74%12,372 flts
- 6pm71%2,163 flts
- 7pm75%1,471 flts
- 8pm71%901 flts
- 10pm80%6,523 flts
Monthly trend
Why departures were late
- Late-arriving aircraft33%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion28%
- Extreme weather7%
- Security0%
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.