Route · SEA → DCA · 2020–2025 BTS data
Seattle to Washington
The SEA–DCA corridor (Seattle, WA → Washington, DC) runs ahead of the national average, served by 3 carriers across roughly 2,329 miles.
Data updated 2026-06-13
- 80.4%
- On-time
- +1.4 pts
- vs US avg
- 64 min
- Delay when late
- 4,424
- Flights
Cancelled
0.9%
Best Month
Jun 2024 93%
Worst Month
Feb 2025 50%
Distance
2,329 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 93 | 13 | 2 | 1 | DL,AS |
| Nov 2025 | 89 | 17 | 0 | 4 | AS,DL |
| Oct 2025 | 93 | 12 | 0 | 0 | AS,DL |
| Sep 2025 | 90 | 32 | 0 | 1 | DL,AS |
| Aug 2025 | 93 | 20 | 2 | 1 | AS,DL |
| Jul 2025 | 93 | 27 | 4 | 5 | AS,DL |
| Jun 2025 | 90 | 27 | 0 | 4 | AS,DL |
| May 2025 | 93 | 21 | 0 | 2 | AS,DL |
| Apr 2025 | 90 | 15 | 0 | 0 | DL,AS |
| Mar 2025 | 85 | 18 | 0 | 1 | AS,DL |
| Feb 2025 | 56 | 28 | 3 | 2 | AS |
| Jan 2025 | 62 | 7 | 3 | 1 | AS |
| Dec 2024 | 62 | 10 | 0 | 0 | AS |
| Nov 2024 | 59 | 6 | 0 | 0 | AS |
| Oct 2024 | 62 | 9 | 0 | 0 | AS |
| Sep 2024 | 60 | 13 | 0 | 0 | AS |
| Aug 2024 | 62 | 15 | 0 | 0 | AS |
| Jul 2024 | 62 | 18 | 0 | 0 | AS |
| Jun 2024 | 60 | 4 | 1 | 1 | AS |
| May 2024 | 62 | 16 | 0 | 0 | AS |
| Apr 2024 | 60 | 16 | 0 | 0 | AS |
| Mar 2024 | 62 | 12 | 0 | 0 | AS |
| Feb 2024 | 58 | 13 | 0 | 0 | AS |
| Jan 2024 | 62 | 18 | 0 | 0 | AS |
Cancellation Rate
0.9%
15 of 1,758 flights
Diversion Rate
1.3%
23 of 1,758 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 →DCA - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Destination airport →Compare the two airports
See SEA and DCA 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–DCA.
Routes with a similar on-time rate
What the Data Says About SEA to DCA
4,424 tracked flights put the SEA to DCA pairing (Seattle to Washington) at a 80.4% on-time rate, squarely in line with the wider network. Delays that do occur run 63.5 minutes on average. Across the 2,329-mile route and its 3 carriers, the trailing 24 months show 0.9% cancelled and 1.3% diverted (1,758 flights sampled).
The monthly split is wide on this route: Jun 2024 posted the strongest performance at 93% on-time, while Feb 2025 came in at just 50% - a 43-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from SEA to DCA? ▼
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Flight Guides
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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.