Route
SEA → IAD
Seattle–Tacoma International Airport Washington Dulles International Airport
How punctual is this route?
- On-time arrivals
- 84.8%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,822
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 53%
- Late-arriving aircraft 28%
- Air traffic control & airport 15%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 87.6% | 179 |
| October 2025 | 85.0% | 155 |
| November 2025 | 84.7% | 119 |
| December 2025 | 87.9% | 124 |
| January 2026 | 82.8% | 102 |
| February 2026 | 86.0% | 94 |
| March 2026 | 84.3% | 117 |
| April 2026 | 89.0% | 129 |
| May 2026 | 86.0% | 202 |
| June 2026 | 83.2% | 198 |
| July 2026 | 80.5% | 212 |
| August 2026 | 83.1% | 191 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Alaska Airlines | 835 | 83.3% | 0.4% | 44 min |
| United Airlines | 626 | 91.4% | 0.6% | 83 min |
| Delta Air Lines | 361 | 76.7% | 1.1% | 85 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL541
24% late · 349 flights
-
AS367
17% late · 284 flights
-
AS737
17% late · 237 flights
-
UA2217
5% late · 159 flights
-
AS406
19% late · 125 flights
-
UA2131
9% late · 105 flights
-
AS348
14% late · 101 flights
-
UA264
11% late · 75 flights
-
UA2463
9% late · 47 flights
-
AS436
14% late · 42 flights
-
UA688
6% late · 34 flights
-
UA2861
6% late · 32 flights
-
AS401
17% late · 29 flights
-
UA2474
4% late · 24 flights
-
UA684
4% late · 24 flights
-
UA2497
0% late · 23 flights
-
UA1523
10% late · 21 flights
-
UA2851
24% late · 21 flights
-
UA755
15% late · 21 flights
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