Airports › Washington (IAD) › September 2024
Airport month · September 2024
Washington Dulles International in September 2024
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 September 2024, reporting carriers scheduled 4,313 domestic departures from Washington Dulles International (IAD). 88.3% left less than 15 minutes late and 86.8% reached their destination on time; 0.5% were cancelled.
Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so IAD departures were 3.9 points above the national departure figure.
A year earlier, in September 2023, the airport had 4,278 departures with 80.3% leaving on time: a change of +8.0 points, with flights up 1%.
Flights arriving at IAD that month were on time 87.7% of the time (4,314 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 34%, late-arriving aircraft 34% and national aviation system 24%.
- On time 86.8%
- Arrived 15+ minutes late 12.6%
- Cancelled 0.5%
- Diverted 0.1%
September 2024 against a year earlier, the airport's year and the nation
| Measure | Sep 2024 | Sep 2023 | IAD, 12 months to Jul 2026 | All reported flights, Sep 2024 |
|---|---|---|---|---|
| Departed on time | 88.3% | 80.3% | 82.6% | 84.4% |
| Arrived on time | 86.8% | 80.1% | 80.1% | 83.9% |
| Cancelled | 0.5% | 1.8% | 1.4% | 0.6% |
| Average departure delay (late minutes only) | 8.7 min | 16.6 min | 14.7 min | 10.6 min |
| Scheduled departures a day | 144 | 143 | 159 | 19,421 |
| Scheduled departures | 4,313 | 4,278 | 58,031 | 582,622 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 2,645 | 61% | 87.5% | -3.3 min | 0.6% |
| YX Republic Airline | 638 | 15% | 90.3% | -4.0 min | 0.0% |
| DL Delta Air Lines | 272 | 6% | 84.9% | -0.8 min | 0.4% |
| OO SkyWest Airlines | 236 | 5% | 85.6% | 4.7 min | 0.0% |
| AS Alaska Airlines | 178 | 4% | 78.1% | 1.2 min | 1.1% |
| OH PSA Airlines | 126 | 3% | 84.1% | 6.7 min | 1.6% |
| WN Southwest Airlines | 106 | 2% | 84.0% | -1.5 min | 0.0% |
| AA American Airlines | 59 | 1% | 67.8% | 11.8 min | 0.0% |
| 9E Endeavor Air | 44 | 1% | 88.6% | -14.7 min | 0.0% |
| G4 Allegiant Air | 9 | 0% | 77.8% | -5.8 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAD–ATL | Washington to Atlanta | 305 | 82.6% | 3.8 min | 0.3% |
| IAD–DEN | Washington to Denver | 287 | 88.2% | -8.2 min | 1.0% |
| IAD–SFO | Washington to San Francisco | 245 | 88.2% | -6.4 min | 0.0% |
| IAD–SEA | Washington to Seattle | 230 | 87.0% | -10.2 min | 1.3% |
| IAD–LAX | Washington to Los Angeles | 215 | 92.1% | -10.3 min | 0.0% |
| IAD–CLT | Washington to Charlotte | 156 | 82.7% | 6.8 min | 1.3% |
| IAD–ORD | Washington to Chicago | 151 | 92.1% | -5.5 min | 0.0% |
| IAD–IAH | Washington to Houston | 150 | 85.3% | -1.3 min | 0.7% |
| IAD–DFW | Washington to Dallas/Fort Worth | 146 | 78.1% | 1.7 min | 0.0% |
| IAD–BOS | Washington to Boston | 120 | 77.5% | 10.7 min | 0.0% |
| IAD–IND | Washington to Indianapolis | 120 | 93.3% | -6.3 min | 0.0% |
| IAD–MCO | Washington to Orlando | 120 | 86.7% | -4.9 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left IAD on time in September 2024?
88.3% of 4,313 scheduled domestic departures left less than 15 minutes late, and 86.8% reached their destination on time. The national figures that month were 84.4% and 83.9%.
How does that compare with a year earlier?
In September 2023, 80.3% of 4,278 departures left on time and 1.8% were cancelled, against 88.3% and 0.5% in September 2024.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; 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.