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Airport · 12 months to July 2026
Washington Dulles International: delays and on-time record
Washington, Virginia
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. Data through July 2026; this is a monthly history, not live airport status.
Reporting carriers scheduled 58,031 domestic departures from Washington Dulles International (IAD), Washington, in the 12 months to July 2026: about 159 a day to 78 destinations.
82.6% of those flights left the gate less than 15 minutes late, 6.5 points above the national departure figure of 76.1%. Flights arriving at IAD were on time 81.9% of the time, 5.9 points above the national arrival figure of 76.0%.
1.4% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 14.7 min.
United Airlines is the largest reporting carrier at IAD with 63% of departures. Among carriers with at least 580 departures, PSA Airlines had the highest on-time arrival share for its IAD departures (82.0%) and Frontier Airlines the lowest (67.8%).
On-time departures are up 1.1 points on the previous 12 months (81.5%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving IAD, late-arriving aircraft 33%, air carrier 31% and national aviation system 28%.
- On time 80.1%
- Arrived 15+ minutes late 18.2%
- Cancelled 1.4%
- Diverted 0.3%
As origin and as destination, against the nation
| Measure | Departures from IAD | Arrivals at IAD | All reported flights | IAD departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 82.6% | 82.6% | 76.1% | 81.5% |
| Arrived on time | 80.1% | 81.9% | 76.0% | 78.7% |
| Cancelled | 1.4% | 1.4% | 1.8% | 1.2% |
| Diverted | 0.3% | 0.1% | 0.3% | 0.2% |
| Average departure delay (late minutes only) | 14.7 min | 13.4 min | 17.4 min | 15.8 min |
| Arrival delay minutes per 100 flights | 1,514 | 1,334 | 1,684 | 1,663 |
| Scheduled flights | 58,031 | 57,761 | 7,043,858 | 56,115 |
12 months to July 2026. The first column follows flights that left IAD; the second follows flights that landed there. Year on year, on-time departures moved +1.1 pts.
Airlines at IAD
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 36,755 | 63% | 81.6% | 3.0 min | 0.9% |
| YX Republic Airline | 8,800 | 15% | 79.9% | 3.5 min | 2.7% |
| DL Delta Air Lines | 3,098 | 5% | 78.5% | 7.2 min | 2.5% |
| OO SkyWest Airlines | 2,475 | 4% | 77.6% | 20.0 min | 2.1% |
| F9 Frontier Airlines | 1,652 | 3% | 67.8% | 17.4 min | 2.3% |
| AA American Airlines | 1,465 | 3% | 75.4% | 10.3 min | 2.5% |
| AS Alaska Airlines | 1,253 | 2% | 73.8% | 3.0 min | 1.0% |
| WN Southwest Airlines | 985 | 2% | 74.8% | 7.2 min | 0.8% |
| OH PSA Airlines | 978 | 2% | 82.0% | 2.0 min | 3.1% |
| G4 Allegiant Air | 570 | 1% | 73.2% | 14.4 min | 0.7% |
Departures from IAD by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 80.1%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from IAD
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAD–ATL | Washington to Atlanta | 3,989 | 76.7% | 8.0 min | 2.1% |
| IAD–DEN | Washington to Denver | 3,465 | 82.1% | 1.9 min | 0.5% |
| IAD–SFO | Washington to San Francisco | 2,729 | 78.0% | 6.0 min | 0.8% |
| IAD–LAX | Washington to Los Angeles | 2,472 | 83.0% | -1.9 min | 0.8% |
| IAD–MCO | Washington to Orlando | 2,177 | 79.9% | 3.6 min | 1.1% |
| IAD–ORD | Washington to Chicago | 2,085 | 74.4% | 12.2 min | 1.0% |
| IAD–CLT | Washington to Charlotte | 1,988 | 81.1% | 2.9 min | 2.6% |
| IAD–DFW | Washington to Dallas/Fort Worth | 1,951 | 75.2% | 11.4 min | 1.9% |
| IAD–IAH | Washington to Houston | 1,873 | 83.7% | -0.7 min | 0.4% |
| IAD–SEA | Washington to Seattle | 1,851 | 76.7% | 4.8 min | 1.0% |
| IAD–EWR | Washington to Newark | 1,532 | 74.2% | 14.7 min | 2.6% |
| IAD–BOS | Washington to Boston | 1,514 | 75.5% | 8.1 min | 2.5% |
| IAD–SAN | Washington to San Diego | 1,402 | 83.3% | -4.2 min | 0.6% |
| IAD–TPA | Washington to Tampa | 1,304 | 82.6% | 0.0 min | 0.8% |
| IAD–RDU | Washington to Raleigh/Durham | 1,300 | 81.9% | 5.3 min | 1.3% |
| IAD–PIT | Washington to Pittsburgh | 1,227 | 83.4% | 3.5 min | 1.5% |
| IAD–DTW | Washington to Detroit | 1,133 | 76.5% | 14.4 min | 1.2% |
| IAD–BDL | Washington to Hartford | 1,077 | 84.7% | 0.7 min | 1.9% |
| IAD–LAS | Washington to Las Vegas | 1,077 | 85.4% | -3.8 min | 0.5% |
| IAD–CLE | Washington to Cleveland | 1,050 | 83.7% | 4.4 min | 1.0% |
| IAD–AUS | Washington to Austin | 1,042 | 83.9% | -1.9 min | 1.0% |
| IAD–PHX | Washington to Phoenix | 1,036 | 80.9% | -0.4 min | 0.8% |
| IAD–BNA | Washington to Nashville | 1,009 | 81.1% | 6.4 min | 0.8% |
| IAD–LGA | Washington to New York | 999 | 69.1% | 10.3 min | 6.5% |
| IAD–IND | Washington to Indianapolis | 989 | 82.9% | 4.1 min | 1.0% |
| IAD–MSP | Washington to Minneapolis | 983 | 83.5% | 2.7 min | 1.5% |
| IAD–CMH | Washington to Columbus | 980 | 82.6% | 2.9 min | 0.9% |
| IAD–PWM | Washington to Portland | 787 | 86.8% | -3.1 min | 1.9% |
| IAD–FLL | Washington to Fort Lauderdale | 781 | 80.0% | 4.3 min | 0.8% |
| IAD–JAX | Washington to Jacksonville | 778 | 82.6% | 1.0 min | 0.9% |
| IAD–CHS | Washington to Charleston | 760 | 85.8% | 2.4 min | 1.1% |
| IAD–SLC | Washington to Salt Lake City | 714 | 81.5% | 8.6 min | 1.4% |
| IAD–SJU | Washington to San Juan | 707 | 75.2% | 11.9 min | 0.6% |
| IAD–ORF | Washington to Norfolk | 689 | 80.1% | 6.2 min | 2.0% |
| IAD–SAT | Washington to San Antonio | 641 | 85.5% | 1.0 min | 0.6% |
| IAD–MSY | Washington to New Orleans | 631 | 85.4% | -0.3 min | 0.6% |
| IAD–MIA | Washington to Miami | 625 | 82.4% | 0.2 min | 0.8% |
| IAD–CVG | Washington to Cincinnati | 534 | 78.7% | 6.7 min | 2.4% |
| IAD–BTV | Washington to Burlington | 500 | 84.2% | 1.2 min | 1.6% |
| IAD–RSW | Washington to Fort Myers | 468 | 86.5% | 1.8 min | 0.6% |
| IAD–SMF | Washington to Sacramento | 365 | 80.3% | 0.0 min | 1.4% |
| IAD–MGW | Washington to Morgantown | 362 | 68.0% | 46.6 min | 6.1% |
| IAD–STT | Washington to Charlotte Amalie | 336 | 86.9% | -7.4 min | 1.2% |
| IAD–PBI | Washington to West Palm Beach/Palm Beach | 334 | 79.9% | 5.4 min | 1.2% |
| IAD–JST | Washington to Johnstown | 330 | 72.4% | 35.1 min | 3.6% |
| IAD–PDX | Washington to Portland | 291 | 75.3% | 11.7 min | 0.7% |
| IAD–ABQ | Washington to Albuquerque | 273 | 77.7% | 7.8 min | 0.7% |
| IAD–SDF | Washington to Louisville | 236 | 84.7% | 6.3 min | 1.7% |
| IAD–PHL | Washington to Philadelphia | 212 | 78.3% | 4.2 min | 4.2% |
| IAD–SAV | Washington to Savannah | 205 | 88.3% | -2.7 min | 1.0% |
| IAD–RIC | Washington to Richmond | 173 | 90.2% | -8.3 min | 2.9% |
| IAD–HNL | Washington to Honolulu | 168 | 73.8% | 3.5 min | 1.2% |
| IAD–BUF | Washington to Buffalo | 147 | 81.0% | 5.8 min | 4.8% |
| IAD–JFK | Washington to New York | 146 | 54.1% | 25.0 min | 4.8% |
| IAD–MCI | Washington to Kansas City | 146 | 77.4% | 15.8 min | 0.7% |
| IAD–LYH | Washington to Lynchburg | 130 | 77.7% | 33.4 min | 0.0% |
| IAD–ROC | Washington to Rochester | 128 | 75.0% | 4.9 min | 1.6% |
The 57 busiest of 78 routes with reported flights. Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 1,161 departures, 8 am to 9 am had the highest on-time share (90.6% of 10,523 flights) and 6 pm to 7 pm the lowest (70.8% of 2,163).
Delay causes
Cancellations by reported reason (814 in the period): air carrier 21%, weather 64%, national aviation system 15%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for IAD on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave IAD on time?
82.6% of the 58,031 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 1.4% were cancelled.
How often do flights arrive at IAD on time?
81.9% of 57,761 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at IAD?
Counting departures from IAD and whether they reached their destination on time, PSA Airlines had the highest share (82.0% of 978 flights), then United Airlines (81.6%) and Republic Airline (79.9%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at IAD?
For departures from IAD that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: late-arriving aircraft 33%, air carrier 31%, national aviation system 28%, extreme weather 7%, security 0%.
What time of day has the highest on-time share at IAD?
Departures scheduled from 8 am to 9 am local time left on time 90.6% of the time, the highest of any hour with enough flights to compare; 6 pm to 7 pm was lowest at 70.8%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 82.6%, up 1.1 points on the previous 12 months (81.5%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at IAD?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.