Route · SEA → BWI · 2020–2025 BTS data
Seattle to Baltimore
The SEA–BWI corridor (Seattle, WA → Baltimore, MD) runs ahead of the national average, served by 3 carriers across roughly 2,335 miles.
Data updated 2026-06-13
- 81.6%
- On-time
- +2.6 pts
- vs US avg
- 47 min
- Delay when late
- 2,624
- Flights
Cancelled
0.1%
Best Month
Sep 2023 95%
Worst Month
May 2025 55%
Distance
2,335 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 60 | 10 | 0 | 0 | AS |
| Nov 2025 | 50 | 6 | 0 | 0 | AS |
| Oct 2025 | 56 | 4 | 1 | 0 | AS,WN |
| Sep 2025 | 90 | 17 | 0 | 0 | WN,AS |
| Aug 2025 | 93 | 31 | 0 | 0 | WN,AS |
| Jul 2025 | 92 | 28 | 0 | 2 | AS,WN |
| Jun 2025 | 86 | 16 | 0 | 0 | AS,WN |
| May 2025 | 58 | 26 | 0 | 1 | AS |
| Apr 2025 | 37 | 12 | 0 | 0 | AS |
| Mar 2025 | 31 | 6 | 0 | 0 | AS |
| Dec 2024 | 54 | 8 | 0 | 0 | AS |
| Nov 2024 | 50 | 4 | 0 | 0 | AS |
| Oct 2024 | 52 | 9 | 0 | 0 | AS |
| Sep 2024 | 59 | 18 | 0 | 0 | AS |
| Aug 2024 | 63 | 12 | 0 | 1 | AS,WN |
| Jul 2024 | 66 | 21 | 0 | 0 | AS,WN |
| Jun 2024 | 64 | 14 | 0 | 0 | AS,WN |
| May 2024 | 62 | 15 | 0 | 0 | AS |
| Apr 2024 | 45 | 8 | 0 | 0 | AS |
| Mar 2024 | 31 | 15 | 0 | 0 | AS |
| Dec 2023 | 31 | 6 | 0 | 0 | AS |
| Nov 2023 | 30 | 6 | 0 | 0 | AS |
| Oct 2023 | 31 | 6 | 0 | 0 | AS |
| Sep 2023 | 60 | 3 | 0 | 1 | AS |
Cancellation Rate
0.1%
1 of 1,351 flights
Diversion Rate
0.4%
5 of 1,351 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 →BWI - Baltimore
Full on-time, delay-cause, and seasonal performance for Baltimore, MD.
Destination airport →Compare the two airports
See SEA and BWI 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–BWI.
Routes with a similar on-time rate
What the Data Says About SEA to BWI
2,624 tracked flights put the SEA to BWI pairing (Seattle to Baltimore) at a 81.6% on-time rate, squarely in line with the wider network. Delays that do occur run 47.3 minutes on average. Across the 2,335-mile route and its 3 carriers, the trailing 24 months show 0.1% cancelled and 0.4% diverted (1,351 flights sampled).
The monthly split is wide on this route: Sep 2023 posted the strongest performance at 95% on-time, while May 2025 came in at just 55% - a 40-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.