Airports › Washington (IAD) › August 2023
Airport month · August 2023
Washington Dulles International in August 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 August 2023, reporting carriers scheduled 4,853 domestic departures from Washington Dulles International (IAD). 80.3% left less than 15 minutes late and 79.3% reached their destination on time; 1.1% were cancelled.
Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so IAD departures were 3.6 points above the national departure figure.
Flights arriving at IAD that month were on time 81.9% of the time (4,855 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 41%, late-arriving aircraft 29% and national aviation system 19%.
- On time 79.3%
- Arrived 15+ minutes late 19.2%
- Cancelled 1.1%
- Diverted 0.3%
August 2023 against a year earlier, the airport's year and the nation
| Measure | Aug 2023 | Year earlier | IAD, 12 months to Jul 2026 | All reported flights, Aug 2023 |
|---|---|---|---|---|
| Departed on time | 80.3% | — | 82.6% | 76.7% |
| Arrived on time | 79.3% | — | 80.1% | 76.9% |
| Cancelled | 1.1% | — | 1.4% | 1.5% |
| Average departure delay (late minutes only) | 15.7 min | — | 14.7 min | 17.3 min |
| Scheduled departures a day | 162 | — | 159 | 20,100 |
| Scheduled departures | 4,853 | — | 58,031 | 602,987 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 2,963 | 61% | 78.1% | 5.2 min | 1.1% |
| YX Republic Airline | 641 | 13% | 88.3% | -2.5 min | 0.9% |
| DL Delta Air Lines | 275 | 6% | 78.2% | 11.8 min | 1.8% |
| OO SkyWest Airlines | 266 | 5% | 80.5% | 12.0 min | 1.9% |
| AS Alaska Airlines | 248 | 5% | 72.6% | 6.3 min | 1.2% |
| WN Southwest Airlines | 174 | 4% | 79.3% | 2.9 min | 0.0% |
| OH PSA Airlines | 108 | 2% | 80.6% | 5.9 min | 1.9% |
| AA American Airlines | 77 | 2% | 79.2% | 1.2 min | 0.0% |
| G4 Allegiant Air | 40 | 1% | 60.0% | 51.2 min | 0.0% |
| 9E Endeavor Air | 36 | 1% | 91.7% | -16.3 min | 0.0% |
| MQ Envoy Air | 25 | 1% | 76.0% | 8.8 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAD–ATL | Washington to Atlanta | 337 | 76.6% | 13.0 min | 1.8% |
| IAD–SEA | Washington to Seattle | 279 | 77.4% | 2.3 min | 0.4% |
| IAD–DEN | Washington to Denver | 277 | 77.6% | 2.3 min | 0.7% |
| IAD–SFO | Washington to San Francisco | 250 | 71.2% | 12.7 min | 2.0% |
| IAD–LAX | Washington to Los Angeles | 244 | 83.2% | -2.2 min | 0.0% |
| IAD–CLT | Washington to Charlotte | 193 | 76.7% | 7.9 min | 1.0% |
| IAD–ORD | Washington to Chicago | 160 | 76.9% | 5.3 min | 1.9% |
| IAD–EWR | Washington to Newark | 155 | 79.4% | 17.6 min | 1.3% |
| IAD–IAH | Washington to Houston | 155 | 80.0% | 5.7 min | 0.6% |
| IAD–SAN | Washington to San Diego | 155 | 83.2% | -8.8 min | 2.6% |
| IAD–DFW | Washington to Dallas/Fort Worth | 153 | 79.1% | 3.8 min | 0.7% |
| IAD–BOS | Washington to Boston | 124 | 69.4% | 12.5 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left IAD on time in August 2023?
80.3% of 4,853 scheduled domestic departures left less than 15 minutes late, and 79.3% reached their destination on time. The national figures that month were 76.7% and 76.9%.
How does that compare with a year earlier?
August 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 August 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.