Route · DCA → SEA · 2020–2025 BTS data
Washington to Seattle
The DCA–SEA corridor (Washington, DC → Seattle, WA) runs ahead of the national average, served by 3 carriers across roughly 2,329 miles.
Data updated 2026-06-13
- 82.3%
- On-time
- +3.3 pts
- vs US avg
- 74 min
- Delay when late
- 4,426
- Flights
Cancelled
1.2%
Best Month
Sep 2024 92%
Worst Month
Dec 2025 46%
Distance
2,329 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 93 | 50 | 2 | 0 | DL,AS |
| Nov 2025 | 89 | 24 | 0 | 0 | AS,DL |
| Oct 2025 | 93 | 18 | 0 | 0 | AS,DL |
| Sep 2025 | 90 | 15 | 0 | 0 | DL,AS |
| Aug 2025 | 93 | 13 | 2 | 0 | AS,DL |
| Jul 2025 | 93 | 36 | 4 | 1 | AS,DL |
| Jun 2025 | 90 | 22 | 0 | 0 | AS,DL |
| May 2025 | 93 | 15 | 0 | 0 | AS,DL |
| Apr 2025 | 90 | 9 | 0 | 0 | DL,AS |
| Mar 2025 | 85 | 12 | 1 | 1 | AS,DL |
| Feb 2025 | 56 | 21 | 4 | 0 | AS |
| Jan 2025 | 62 | 16 | 4 | 0 | AS |
| Dec 2024 | 62 | 14 | 0 | 0 | AS |
| Nov 2024 | 59 | 5 | 1 | 0 | AS |
| Oct 2024 | 62 | 6 | 0 | 0 | AS |
| Sep 2024 | 60 | 5 | 0 | 0 | AS |
| Aug 2024 | 62 | 9 | 0 | 0 | AS |
| Jul 2024 | 62 | 12 | 0 | 0 | AS |
| Jun 2024 | 60 | 9 | 1 | 1 | AS |
| May 2024 | 62 | 11 | 0 | 0 | AS |
| Apr 2024 | 60 | 9 | 0 | 0 | AS |
| Mar 2024 | 62 | 7 | 0 | 0 | AS |
| Feb 2024 | 58 | 6 | 0 | 0 | AS |
| Jan 2024 | 62 | 16 | 2 | 0 | AS |
Cancellation Rate
1.2%
21 of 1,758 flights
Diversion Rate
0.2%
3 of 1,758 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
DCA - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See DCA and SEA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to DCA–SEA.
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What the Data Says About DCA to SEA
Bureau of Transportation Statistics records show Washington to Seattle (DCA to SEA) running a 82.3% on-time rate over 4,426 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 73.7 minutes. The 2,329-mile corridor is served by 3 carriers, and over the last 24 months 1.2% of 1,758 flights were cancelled, 0.2% diverted.
The monthly split is wide on this route: Sep 2024 posted the strongest performance at 92% on-time, while Dec 2025 came in at just 46% - a 45-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.