Airports › Washington (IAD) › September 2023
Airport month · September 2023
Washington Dulles International in September 2023
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 2023, reporting carriers scheduled 4,278 domestic departures from Washington Dulles International (IAD). 80.3% left less than 15 minutes late and 80.1% reached their destination on time; 1.8% were cancelled.
Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so IAD departures were level with the national departure figure.
Flights arriving at IAD that month were on time 79.6% of the time (4,274 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 37%, late-arriving aircraft 24% and extreme weather 21%.
- On time 80.1%
- Arrived 15+ minutes late 18.0%
- Cancelled 1.8%
- Diverted 0.1%
September 2023 against a year earlier, the airport's year and the nation
| Measure | Sep 2023 | Year earlier | IAD, 12 months to Jul 2026 | All reported flights, Sep 2023 |
|---|---|---|---|---|
| Departed on time | 80.3% | — | 82.6% | 80.5% |
| Arrived on time | 80.1% | — | 80.1% | 80.1% |
| Cancelled | 1.8% | — | 1.4% | 1.2% |
| Average departure delay (late minutes only) | 16.6 min | — | 14.7 min | 14.1 min |
| Scheduled departures a day | 143 | — | 159 | 18,978 |
| Scheduled departures | 4,278 | — | 58,031 | 569,338 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 2,814 | 66% | 78.5% | 8.0 min | 1.6% |
| YX Republic Airline | 321 | 8% | 86.9% | -4.8 min | 3.7% |
| OO SkyWest Airlines | 254 | 6% | 76.4% | 7.2 min | 3.1% |
| DL Delta Air Lines | 253 | 6% | 86.2% | 5.0 min | 2.4% |
| AS Alaska Airlines | 203 | 5% | 83.3% | -4.0 min | 0.5% |
| WN Southwest Airlines | 152 | 4% | 83.6% | 4.4 min | 0.7% |
| OH PSA Airlines | 121 | 3% | 87.6% | 6.2 min | 1.7% |
| AA American Airlines | 69 | 2% | 76.8% | 0.2 min | 2.9% |
| 9E Endeavor Air | 34 | 1% | 88.2% | -11.5 min | 2.9% |
| G4 Allegiant Air | 33 | 1% | 72.7% | 47.9 min | 0.0% |
| MQ Envoy Air | 24 | 1% | 83.3% | -2.7 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAD–ATL | Washington to Atlanta | 310 | 85.2% | 6.7 min | 0.6% |
| IAD–DEN | Washington to Denver | 248 | 83.5% | 6.6 min | 1.2% |
| IAD–SEA | Washington to Seattle | 242 | 81.8% | -1.4 min | 3.3% |
| IAD–SFO | Washington to San Francisco | 230 | 78.3% | 3.7 min | 0.9% |
| IAD–LAX | Washington to Los Angeles | 198 | 77.3% | 4.2 min | 0.5% |
| IAD–ORD | Washington to Chicago | 160 | 75.0% | 7.1 min | 1.3% |
| IAD–DFW | Washington to Dallas/Fort Worth | 158 | 76.6% | 5.1 min | 1.3% |
| IAD–SAN | Washington to San Diego | 150 | 89.3% | -5.9 min | 1.3% |
| IAD–IAH | Washington to Houston | 148 | 79.1% | 6.2 min | 0.7% |
| IAD–EWR | Washington to Newark | 132 | 81.1% | 13.9 min | 1.5% |
| IAD–CLT | Washington to Charlotte | 131 | 85.5% | 6.0 min | 1.5% |
| IAD–BOS | Washington to Boston | 120 | 57.5% | 29.1 min | 5.8% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left IAD on time in September 2023?
80.3% of 4,278 scheduled domestic departures left less than 15 minutes late, and 80.1% reached their destination on time. The national figures that month were 80.5% and 80.1%.
How does that compare with a year earlier?
September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; 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.