Airport reliability
Washington (IAD) on-time performance
How reliably flights leave Washington, VA (IAD) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Washington, VA57,762 departures in 12 months
- Departures on time
- 79.6% U.S. average 75.6%
- Cancelled
- 1.4% U.S. average 1.9%
- 60+ minutes late
- 7.0% U.S. average 8.1%
- Scheduled departures
- 57,762 12 months
What this means
IAD departures beat the U.S. average.
- 79.6% of the 57,762 scheduled departures from Washington (IAD) arrived at their destination on time, 4.0 points higher than the U.S. average of 75.6%.
- 1.4% of departures were cancelled (U.S. average 1.9%), and 7.0% arrived an hour or more late.
- Flights arriving at IAD were on time 81.7% of the time.
- Among airlines with at least 300 departures, United Airlines was the most punctual from IAD (81.1%) and Frontier Airlines the least (66.3%).
- Over the last 3 years, October was the most reliable month for departures from IAD (87.8% on time) and July the least reliable (70.3%).
- Cancellations peaked in January, when 5.3% of flights were cancelled.
- Flights scheduled to depart 9 am to 10 am were the most punctual (88.9% on time); flights scheduled to depart 9 pm to 10 pm were the least (64.5%).
Airlines at IAD
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| United Airlines | 81.1% | 0.9% | 6.5% | 73 min | 36,915 |
| PSA AirlinesSold as American Eagle | 80.9% | 3.2% | 6.7% | 114 min | 967 |
| Republic AirwaysSold as American Eagle, Delta Connection, United Express | 78.9% | 3.0% | 6.5% | 75 min | 8,421 |
| Delta Air Lines | 78.1% | 2.4% | 7.6% | 93 min | 3,159 |
| SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska | 77.3% | 2.1% | 11.4% | 148 min | 2,514 |
| American Airlines | 75.7% | 2.1% | 8.6% | 103 min | 1,505 |
| Southwest Airlines | 75.2% | 0.9% | 4.8% | 47 min | 872 |
| Alaska Airlines | 73.7% | 1.1% | 6.3% | 51 min | 1,196 |
| Allegiant Air | 71.4% | 0.9% | 11.1% | 106 min | 531 |
| Frontier Airlines | 66.3% | 2.8% | 12.1% | 94 min | 1,682 |
Tap a heading to sort.
On-time rate by departure hour
Share of scheduled flights on time IAD average 79.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing before 6 am | 86.0% | 265 |
| Departing 6 am to 7 am | 86.9% | 3,361 |
| Departing 7 am to 8 am | 79.5% | 1,690 |
| Departing 8 am to 9 am | 87.6% | 10,383 |
| Departing 9 am to 10 am | 88.9% | 2,846 |
| Departing 10 am to 11 am | 84.8% | 967 |
| Departing 11 am to noon | 85.6% | 638 |
| Departing noon to 1 pm | 82.0% | 8,402 |
| Departing 1 pm to 2 pm | 81.0% | 2,361 |
| Departing 2 pm to 3 pm | 79.3% | 980 |
| Departing 3 pm to 4 pm | 74.8% | 1,533 |
| Departing 4 pm to 5 pm | 76.4% | 979 |
| Departing 5 pm to 6 pm | 71.5% | 12,128 |
| Departing 6 pm to 7 pm | 68.4% | 2,342 |
| Departing 7 pm to 8 pm | 71.8% | 1,426 |
| Departing 8 pm to 9 pm | 68.6% | 897 |
| Departing 9 pm to 10 pm | 64.5% | 124 |
| Departing 10 pm to 11 pm | 77.8% | 6,438 |
| Departing 11 pm to midnight | Insufficient sample | 2 |
Best and worst months at IAD
Share of scheduled flights on time 12-month average 79.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 75.3% | 12,244 |
| February | 83.1% | 11,540 |
| March | 81.9% | 13,875 |
| April | 83.9% | 14,183 |
| May | 77.9% | 15,613 |
| June | 74.5% | 14,841 |
| July | 70.3% | 15,198 |
| August | 76.1% | 14,717 |
| September | 84.5% | 13,406 |
| October | 87.8% | 14,043 |
| November | 85.4% | 12,975 |
| December | 80.4% | 13,135 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 86.4% | 4,815 |
| Oct 2025 | 84.3% | 4,854 |
| Nov 2025 | 80.5% | 4,589 |
| Dec 2025 | 74.0% | 4,676 |
| Jan 2026 | 78.2% | 4,248 |
| Feb 2026 | 82.1% | 4,037 |
| Mar 2026 | 77.9% | 4,983 |
| Apr 2026 | 86.8% | 4,843 |
| May 2026 | 83.4% | 5,474 |
| Jun 2026 | 77.1% | 5,053 |
| Jul 2026 | 70.9% | 5,258 |
| Aug 2026 | 74.0% | 4,932 |
Busiest routes from IAD
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| Atlanta (ATL) | 75.9% | 2.3% | 4 | 4,003 |
| Denver (DEN) | 82.1% | 0.6% | 2 | 3,387 |
| San Francisco (SFO) | 76.9% | 0.7% | 1 | 2,688 |
| Los Angeles (LAX) | 83.4% | 0.7% | 2 | 2,460 |
| Orlando (MCO) | 79.4% | 1.1% | 2 | 2,180 |
| Chicago (ORD) | 73.8% | 0.9% | 1 | 2,106 |
| Charlotte (CLT) | 80.7% | 2.7% | 4 | 1,990 |
| Dallas/Fort Worth (DFW) | 74.9% | 1.6% | 4 | 1,961 |
| Houston (IAH) | 84.2% | 0.5% | 1 | 1,862 |
| Seattle (SEA) | 76.7% | 1.0% | 3 | 1,821 |
| Newark (EWR) | 74.9% | 2.8% | 2 | 1,560 |
| Boston (BOS) | 74.7% | 2.8% | 2 | 1,524 |
| San Diego (SAN) | 81.7% | 0.7% | 2 | 1,402 |
| Tampa (TPA) | 83.1% | 0.8% | 2 | 1,287 |
| Raleigh/Durham (RDU) | 81.8% | 1.3% | 2 | 1,275 |
| Pittsburgh (PIT) | 82.7% | 1.7% | 2 | 1,213 |
| Detroit (DTW) | 77.2% | 1.3% | 4 | 1,178 |
| Hartford (BDL) | 84.3% | 1.7% | 2 | 1,082 |
| Cleveland (CLE) | 83.0% | 1.1% | 2 | 1,076 |
| Las Vegas (LAS) | 84.8% | 0.6% | 2 | 1,069 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Washington, VA (IAD) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.