Washington Dulles International (IAD) on-time performance, September 2026
10,897 scheduled airline departures from Washington in September 2026, 74.5% of them on time. Measured from FAA departure data, updated every morning.
On time, day by day
Share of departures within 15 minutes of schedule, by day. Light bars show each day's departures for context. Worst day: Friday 4 September at 54.4%. Best: Tuesday 8 September at 88.9%.
Airlines at IAD, ranked by on-time share
Scheduled airlines with at least 30 departures from IAD in the month. Regional partners (SkyWest, Republic, Envoy and the like) appear under their own names; fractional and charter operators are in the totals but not listed.
| Airline | Departures | On time | 45+ min late | Avg delay (min) |
|---|---|---|---|---|
| Federal Express FDX | 84 | 100.0% | 0.0% | -21.8 |
| TAI TAI | 91 | 96.7% | 1.1% | -13.0 |
| Swissair SWR | 30 | 96.7% | 0.0% | -5.9 |
| Copa Airlines CMP | 81 | 96.3% | 3.7% | -2.9 |
| Rovos Air VOS | 30 | 93.3% | 3.3% | -7.4 |
| Etihad Airways ETD | 30 | 93.3% | 0.0% | -7.3 |
| Qatar Airways QTR | 43 | 93.0% | 0.0% | -1.3 |
| Aer Lingus EIN | 60 | 90.0% | 5.0% | -8.0 |
| Mountain Air Cargo MTN | 55 | 89.1% | 7.3% | -0.0 |
| United Parcel Service UPS | 55 | 87.3% | 3.6% | -5.9 |
| All Nippon Airways ANA | 30 | 86.7% | 6.7% | 5.4 |
| Breeze Airways MXY | 63 | 84.1% | 6.3% | 2.2 |
| Icelandair ICE | 40 | 82.5% | 0.0% | -1.9 |
| Avianca AVA | 56 | 82.1% | 5.4% | -0.4 |
| Alaska Airlines ASA | 121 | 81.8% | 4.1% | 3.4 |
| FDY FDY | 133 | 81.2% | 5.3% | -3.7 |
| American Airlines AAL | 136 | 80.1% | 10.3% | 7.6 |
| CommutAir UCA | 1,144 | 80.0% | 8.8% | 10.6 |
| Jazz (Air Canada Express) JZA | 135 | 80.0% | 7.4% | 2.8 |
| Aeromexico AMX | 30 | 80.0% | 3.3% | 5.7 |
| Republic Airways RPA | 808 | 78.0% | 11.6% | 13.8 |
| Air France AFR | 50 | 78.0% | 4.0% | 6.1 |
| Emirates UAE | 30 | 76.7% | 3.3% | 0.6 |
| Korean Air KAL | 30 | 76.7% | 6.7% | 11.7 |
| Delta Air Lines DAL | 342 | 76.3% | 11.7% | 7.6 |
| Mesa Airlines ASH | 1,038 | 75.6% | 12.2% | 14.3 |
| Ethiopian Airlines ETH | 42 | 73.8% | 4.8% | 8.8 |
| Nova Scotia Department of Lands and Forests PTR | 45 | 73.3% | 15.6% | 15.4 |
| PSA Airlines JIA | 88 | 72.7% | 14.8% | 12.3 |
| GTA Air GTX | 50 | 72.0% | 6.0% | 4.6 |
| GoJet Airlines GJS | 758 | 71.5% | 15.4% | 24.2 |
| SkyWest SKW | 229 | 71.2% | 14.4% | 28.7 |
| TAP Portugal TAP | 59 | 71.2% | 1.7% | 5.6 |
| Corporate Flight Management VTE | 62 | 71.0% | 14.5% | 14.3 |
| United Airlines UAL | 3,967 | 70.9% | 13.6% | 17.8 |
| Iberia IBE | 30 | 70.0% | 13.3% | 12.2 |
| Frontier Airlines FFT | 202 | 69.3% | 20.8% | 22.4 |
| Turkish Airlines THY | 60 | 53.3% | 25.0% | 27.4 |
| Lufthansa DLH | 90 | 47.8% | 13.3% | 20.4 |
| British Airways BAW | 82 | 47.6% | 17.1% | 24.2 |
Destinations with the longest delays
Routes from IAD with at least 20 departures, by average departure delay.
| To | Flights | On time | Avg delay |
|---|---|---|---|
| KMGW KMGW | 26 | 42.3% | 83.7 |
| JST Johnstown | 22 | 63.6% | 53.4 |
| EWR Newark | 263 | 67.3% | 46.6 |
| BOS Boston | 131 | 52.7% | 40.1 |
| MUC Munich | 60 | 46.7% | 33.9 |
| LGA New York | 122 | 57.4% | 33.5 |
| FRA Frankfurt | 118 | 41.5% | 30.2 |
| CDG Paris | 110 | 56.4% | 29.0 |
| EDI Edinburgh | 31 | 58.1% | 28.1 |
| IST Arnavutköy, Istanbul | 60 | 53.3% | 27.4 |
Busiest destinations
The ten routes with the most departures from IAD this month.
| To | Flights | On time | Avg delay |
|---|---|---|---|
| ATL Atlanta | 355 | 75.8% | 10.4 |
| EWR Newark | 263 | 67.3% | 46.6 |
| CLT Charlotte | 249 | 80.3% | 8.8 |
| DEN Denver | 235 | 86.0% | 5.5 |
| ORD Chicago | 221 | 70.1% | 24.5 |
| SFO San Francisco | 221 | 73.8% | 12.7 |
| DTW Detroit | 202 | 79.2% | 11.2 |
| LAX Los Angeles | 184 | 78.3% | 10.6 |
| YYZ Toronto | 177 | 74.0% | 14.6 |
| SEA Seattle | 177 | 80.2% | 5.9 |
Other months for IAD
Airline pages for September 2026
How we measure
On time means the aircraft took off within 15 minutes of its scheduled departure, after subtracting the departure airport's normal taxi time at IAD (FAA SWIM reports wheels-off, not push-back, so the median taxi time of the last 30 days is taken off every flight first). Average delay is the mean of that taxi-adjusted delay over all departures; early departures count as negative minutes, so an operator that routinely leaves early can show a negative average. 45+ min late is the share of departures that left 45 minutes or more behind schedule, the point at which most connections are at risk.
Scope: scheduled airlines only, the same set as the monthly State of the Sky report (operators with published routes; private, fractional and charter operators are left out), so the two publications give the same numbers for the same month. Departures are counted by scheduled day (UTC). Each day's flights are rolled up overnight and published the next morning; the newest day keeps filling in for a day or two and is only shown once it is substantially complete. Figures can differ by a few tenths of a point from the State of the Sky report for the same month: that report is frozen on the 2nd of the following month, while these pages are rebuilt from the live rollup, which recomputes each airport's taxi baseline nightly and re-rolls the last week of the month as late departure times arrive (September 2026 at SFO: 16,398 departures in both, 69.2% on time here against 69.5% in the report).
Source: FAA System Wide Information Management (SWIM) flight plans and departure times, processed by PlaneTrack. Free to quote with credit to PlaneTrack (CC BY 4.0).