Route · SEA → IAD · 2020–2025 BTS data
Seattle to Washington
The SEA–IAD corridor (Seattle, WA → Washington, DC) runs ahead of the national average, served by 8 carriers across roughly 2,306 miles.
Data updated 2026-06-13
- 83.2%
- On-time
- +4.2 pts
- vs US avg
- 65 min
- Delay when late
- 10,099
- Flights
Cancelled
1.2%
Best Month
Nov 2024 89%
Worst Month
Jul 2025 70%
Distance
2,306 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 124 | 15 | 0 | 0 | DL,AS,UA |
| Nov 2025 | 119 | 18 | 0 | 1 | UA,AS,DL |
| Oct 2025 | 155 | 23 | 2 | 0 | AS,UA,DL |
| Sep 2025 | 179 | 22 | 0 | 1 | UA,DL,AS |
| Aug 2025 | 222 | 62 | 1 | 0 | UA,AS,DL |
| Jul 2025 | 245 | 74 | 1 | 2 | AS,UA,DL |
| Jun 2025 | 240 | 55 | 3 | 3 | AS,UA,DL |
| May 2025 | 203 | 50 | 2 | 1 | AS,UA,DL |
| Apr 2025 | 155 | 29 | 0 | 0 | UA,AS,DL |
| Mar 2025 | 116 | 20 | 0 | 0 | AS,DL,UA |
| Feb 2025 | 94 | 18 | 0 | 1 | AS,DL,UA |
| Jan 2025 | 103 | 20 | 2 | 0 | AS,DL,UA |
| Dec 2024 | 135 | 19 | 0 | 1 | AS,DL,UA |
| Nov 2024 | 180 | 20 | 0 | 0 | UA,AS,DL |
| Oct 2024 | 194 | 22 | 0 | 0 | UA,AS,DL |
| Sep 2024 | 231 | 35 | 2 | 0 | UA,AS,DL |
| Aug 2024 | 264 | 44 | 3 | 6 | AS,DL,UA |
| Jul 2024 | 278 | 58 | 8 | 0 | AS,DL,UA |
| Jun 2024 | 270 | 50 | 1 | 1 | AS,DL,UA |
| May 2024 | 228 | 51 | 2 | 0 | AS,DL,UA |
| Apr 2024 | 147 | 25 | 0 | 0 | AS,DL,UA |
| Mar 2024 | 119 | 33 | 0 | 0 | AS,DL,UA |
| Feb 2024 | 96 | 14 | 0 | 0 | AS,DL,UA |
| Jan 2024 | 104 | 21 | 24 | 0 | AS,DL,UA |
Cancellation Rate
1.2%
51 of 4,201 flights
Diversion Rate
0.4%
17 of 4,201 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Origin airport →IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Destination airport →Compare the two airports
See SEA and IAD side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–IAD.
Routes with a similar on-time rate
What the Data Says About SEA to IAD
Bureau of Transportation Statistics records show Seattle to Washington (SEA to IAD) running a 83.2% on-time rate over 10,099 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 64.9 minutes. The 2,306-mile corridor is served by 8 carriers, and over the last 24 months 1.2% of 4,201 flights were cancelled, 0.4% diverted.
The monthly split is wide on this route: Nov 2024 posted the strongest performance at 89% on-time, while Jul 2025 came in at just 70% - a 19-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.