IAD · Washington Dulles International Airport
Washington, DC. All airports.
Share of flights 15+ min late, by month
departures
arrivals
usual for the month (departures)
Jan 2015 → Jul 2026; gridlines 10/20/30/40%
Recent months — departures
| Month | Flights | Late 15+ | vs usual | Cancelled | Avg min | Main cause |
|---|---|---|---|---|---|---|
| Jul 2026 | 5,258 | 24.7% | -0.2 | 3.2% | 26 | Late aircraft |
| Jun 2026 | 5,053 | 17.1% | -4.4 | 0.9% | 17 | Late aircraft |
| May 2026 | 5,474 | 13.3% | -4.4 | 0.6% | 13 | Late aircraft |
| Apr 2026 | 4,843 | 10.7% | -4.2 | 0.3% | 9 | Airline |
| Mar 2026 | 4,983 | 20.2% | +4.7 | 1.8% | 19 | Late aircraft |
| Feb 2026 | 4,037 | 14.8% | +0.4 | 1.3% | 12 | Airline |
| Jan 2026 | 4,248 | 16.0% | -2.4 | 5.6% | 15 | Airline |
| Dec 2025 | 4,676 | 21.5% | +2.1 | 0.7% | 17 | Late aircraft |
| Nov 2025 | 4,589 | 15.2% | +3.9 | 1.5% | 13 | Late aircraft |
| Oct 2025 | 4,854 | 12.5% | -0.1 | 0.3% | 10 | Late aircraft |
| Sep 2025 | 4,815 | 11.2% | -1.2 | 0.3% | 9 | Late aircraft |
| Aug 2025 | 5,201 | 16.8% | -4.2 | 0.8% | 14 | Late aircraft |
| Jul 2025 | 5,248 | 28.7% | +4.8 | 2.9% | 31 | Late aircraft |
| Jun 2025 | 5,271 | 26.3% | +5.7 | 1.1% | 26 | Late aircraft |
| May 2025 | 5,491 | 19.3% | +3.3 | 0.6% | 17 | Air traffic |
| Apr 2025 | 5,036 | 12.7% | -2.2 | 0.4% | 10 | Air traffic |
| Mar 2025 | 4,615 | 14.1% | -1.3 | 0.4% | 12 | Air traffic |
| Feb 2025 | 3,742 | 14.5% | +0.1 | 1.0% | 11 | Air traffic |
| Jan 2025 | 4,008 | 18.6% | +3.2 | 3.1% | 16 | Airline |
| Dec 2024 | 4,479 | 19.5% | +2.7 | 0.3% | 15 | Late aircraft |
| Nov 2024 | 4,666 | 11.3% | -0.3 | 0.3% | 9 | Airline |
| Oct 2024 | 4,662 | 9.4% | -3.2 | 0.7% | 6 | Airline |
| Sep 2024 | 4,313 | 11.2% | -2.1 | 0.5% | 9 | Airline |
| Aug 2024 | 4,584 | 22.2% | +1.4 | 2.9% | 25 | Late aircraft |
Airlines here, May 2026 (departures)
| Airline | Flights | Late | Canc. |
|---|---|---|---|
| Republic | 718 | 10.2% | 1.5% |
| PSA | 67 | 10.6% | 1.5% |
| United | 3,541 | 12.1% | 0.2% |
| Alaska | 120 | 12.5% | 0.0% |
| Delta | 299 | 13.4% | 2.3% |
| Allegiant | 48 | 14.6% | 0.0% |
| SkyWest | 259 | 17.8% | 0.4% |
| Frontier | 167 | 19.2% | 0.0% |
| American | 162 | 27.7% | 1.9% |
| Southwest | 93 | 40.9% | 0.0% |
Airlines with 30+ departures that month.
Worst days on record
| Date | Flights | Late | Canc. |
|---|---|---|---|
| 2016-01-23 | 59 | — | 100% |
| 2016-01-24 | 79 | — | 100% |
| 2026-01-25 | 143 | 0% | 99% |
| 2022-01-03 | 160 | 86% | 40% |
| 2026-01-26 | 141 | 84% | 37% |
| 2024-07-19 | 155 | 86% | 27% |
| 2025-01-06 | 141 | 76% | 38% |
| 2015-03-05 | 108 | 72% | 36% |
| 2016-12-17 | 86 | 76% | 16% |
| 2015-02-21 | 86 | 69% | 26% |
| 2022-03-12 | 134 | 73% | 9% |
| 2019-02-20 | 168 | 56% | 42% |
Departures; ranked by share late or cancelled.
FAA programs, last 90 days
| Started (UTC) | What | Hours |
|---|---|---|
| 2026-10-16 22:15 | Ground stop | 1.2 |
| 2026-10-16 22:15 | Departure delays | 5.8 |