Airports › Washington (IAD) › April 2025
Airport month · April 2025
Washington Dulles International in April 2025
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In April 2025, reporting carriers scheduled 5,036 domestic departures from Washington Dulles International (IAD). 87.0% left less than 15 minutes late and 82.3% reached their destination on time; 0.4% were cancelled.
Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so IAD departures were 6.4 points above the national departure figure.
A year earlier, in April 2024, the airport had 4,304 departures with 84.8% leaving on time: a change of +2.2 points, with flights up 17%.
Flights arriving at IAD that month were on time 85.1% of the time (5,030 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 35%, air carrier 33% and late-arriving aircraft 30%.
- On time 82.3%
- Arrived 15+ minutes late 17.0%
- Cancelled 0.4%
- Diverted 0.2%
April 2025 against a year earlier, the airport's year and the nation
| Measure | Apr 2025 | Apr 2024 | IAD, 12 months to Jul 2026 | All reported flights, Apr 2025 |
|---|---|---|---|---|
| Departed on time | 87.0% | 84.8% | 82.6% | 80.6% |
| Arrived on time | 82.3% | 82.5% | 80.1% | 79.5% |
| Cancelled | 0.4% | 0.4% | 1.4% | 0.8% |
| Average departure delay (late minutes only) | 10.1 min | 11.5 min | 14.7 min | 14.1 min |
| Scheduled departures a day | 168 | 144 | 159 | 19,465 |
| Scheduled departures | 5,036 | 4,304 | 58,031 | 583,950 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 2,991 | 59% | 81.4% | 2.0 min | 0.2% |
| YX Republic Airline | 929 | 18% | 87.5% | -0.7 min | 0.5% |
| DL Delta Air Lines | 254 | 5% | 81.1% | 3.6 min | 0.4% |
| OO SkyWest Airlines | 238 | 5% | 87.4% | 4.0 min | 1.3% |
| AS Alaska Airlines | 186 | 4% | 84.9% | -2.5 min | 0.5% |
| OH PSA Airlines | 142 | 3% | 76.8% | 9.6 min | 0.0% |
| WN Southwest Airlines | 112 | 2% | 77.7% | 5.9 min | 0.0% |
| F9 Frontier Airlines | 99 | 2% | 65.7% | 17.5 min | 3.0% |
| AA American Airlines | 61 | 1% | 75.4% | 13.1 min | 1.6% |
| G4 Allegiant Air | 24 | 0% | 83.3% | -0.9 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAD–ATL | Washington to Atlanta | 318 | 78.6% | 7.2 min | 1.3% |
| IAD–DEN | Washington to Denver | 292 | 77.4% | 7.2 min | 0.3% |
| IAD–SFO | Washington to San Francisco | 286 | 86.4% | -6.9 min | 0.7% |
| IAD–LAX | Washington to Los Angeles | 242 | 89.7% | -6.7 min | 0.0% |
| IAD–CLT | Washington to Charlotte | 224 | 80.8% | 3.8 min | 0.0% |
| IAD–MCO | Washington to Orlando | 218 | 76.1% | 4.6 min | 0.0% |
| IAD–IAH | Washington to Houston | 180 | 81.1% | 0.9 min | 0.0% |
| IAD–ORD | Washington to Chicago | 180 | 78.3% | 3.8 min | 0.6% |
| IAD–SEA | Washington to Seattle | 155 | 85.2% | -3.4 min | 0.0% |
| IAD–BOS | Washington to Boston | 154 | 81.8% | 3.1 min | 0.0% |
| IAD–TPA | Washington to Tampa | 151 | 85.4% | -2.1 min | 0.0% |
| IAD–EWR | Washington to Newark | 143 | 53.8% | 39.2 min | 3.5% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left IAD on time in April 2025?
87.0% of 5,036 scheduled domestic departures left less than 15 minutes late, and 82.3% reached their destination on time. The national figures that month were 80.6% and 79.5%.
How does that compare with a year earlier?
In April 2024, 84.8% of 4,304 departures left on time and 0.4% were cancelled, against 87.0% and 0.4% in April 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for April 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for IAD · methodology · corrections.