Airports › Washington (IAD) › December 2023
Airport month · December 2023
Washington Dulles International in December 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 December 2023, reporting carriers scheduled 3,980 domestic departures from Washington Dulles International (IAD). 86.7% left less than 15 minutes late and 88.1% reached their destination on time; 0.3% were cancelled.
Nationally that month, 83.1% of flights departed on time and 83.8% arrived on time, so IAD departures were 3.6 points above the national departure figure.
Flights arriving at IAD that month were on time 85.4% of the time (3,974 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 47%, late-arriving aircraft 28% and national aviation system 20%.
- On time 88.1%
- Arrived 15+ minutes late 11.4%
- Cancelled 0.3%
- Diverted 0.3%
December 2023 against a year earlier, the airport's year and the nation
| Measure | Dec 2023 | Year earlier | IAD, 12 months to Jul 2026 | All reported flights, Dec 2023 |
|---|---|---|---|---|
| Departed on time | 86.7% | — | 82.6% | 83.1% |
| Arrived on time | 88.1% | — | 80.1% | 83.8% |
| Cancelled | 0.3% | — | 1.4% | 0.4% |
| Average departure delay (late minutes only) | 9.8 min | — | 14.7 min | 11.6 min |
| Scheduled departures a day | 133 | — | 159 | 19,013 |
| Scheduled departures | 3,980 | — | 58,031 | 570,394 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 2,424 | 61% | 87.4% | -6.3 min | 0.2% |
| YX Republic Airline | 550 | 14% | 92.0% | -8.1 min | 0.2% |
| DL Delta Air Lines | 231 | 6% | 91.8% | -4.3 min | 0.4% |
| OO SkyWest Airlines | 215 | 5% | 86.0% | -4.2 min | 0.5% |
| WN Southwest Airlines | 149 | 4% | 89.9% | -3.1 min | 1.3% |
| AS Alaska Airlines | 148 | 4% | 86.5% | -11.1 min | 0.0% |
| OH PSA Airlines | 111 | 3% | 82.0% | 15.4 min | 0.0% |
| AA American Airlines | 61 | 2% | 85.2% | 20.0 min | 0.0% |
| 9E Endeavor Air | 40 | 1% | 92.5% | -18.2 min | 0.0% |
| G4 Allegiant Air | 30 | 1% | 80.0% | -5.1 min | 0.0% |
| MQ Envoy Air | 21 | 1% | 85.7% | -6.3 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAD–ATL | Washington to Atlanta | 270 | 90.7% | -0.8 min | 0.4% |
| IAD–DEN | Washington to Denver | 234 | 91.5% | -8.9 min | 0.0% |
| IAD–LAX | Washington to Los Angeles | 188 | 89.9% | -13.8 min | 0.0% |
| IAD–SFO | Washington to San Francisco | 184 | 87.0% | -13.4 min | 0.5% |
| IAD–CLT | Washington to Charlotte | 139 | 83.5% | 12.7 min | 0.0% |
| IAD–DFW | Washington to Dallas/Fort Worth | 139 | 87.8% | 4.7 min | 0.0% |
| IAD–SAN | Washington to San Diego | 138 | 93.5% | -20.9 min | 0.7% |
| IAD–EWR | Washington to Newark | 132 | 87.1% | -1.9 min | 0.8% |
| IAD–SEA | Washington to Seattle | 129 | 86.8% | -10.7 min | 0.0% |
| IAD–MCO | Washington to Orlando | 126 | 78.6% | 0.3 min | 0.0% |
| IAD–BOS | Washington to Boston | 124 | 86.3% | 0.4 min | 0.8% |
| IAD–ORD | Washington to Chicago | 123 | 89.4% | -7.4 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left IAD on time in December 2023?
86.7% of 3,980 scheduled domestic departures left less than 15 minutes late, and 88.1% reached their destination on time. The national figures that month were 83.1% and 83.8%.
How does that compare with a year earlier?
December 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 December 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.