Route · BWI → SEA · 2020–2025 BTS data
Baltimore to Seattle
The BWI–SEA corridor (Baltimore, MD → Seattle, WA) runs behind the national average, served by 3 carriers across roughly 2,335 miles.
Data updated 2026-06-13
- 73.8%
- On-time
- -5.2 pts
- vs US avg
- 56 min
- Delay when late
- 2,623
- Flights
Cancelled
0.7%
Best Month
Oct 2025 89%
Worst Month
Dec 2025 33%
Distance
2,335 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 60 | 40 | 1 | 0 | AS |
| Nov 2025 | 50 | 11 | 0 | 0 | AS |
| Oct 2025 | 56 | 6 | 1 | 0 | AS,WN |
| Sep 2025 | 90 | 13 | 0 | 0 | WN,AS |
| Aug 2025 | 93 | 17 | 1 | 0 | WN,AS |
| Jul 2025 | 92 | 43 | 0 | 1 | AS,WN |
| Jun 2025 | 86 | 35 | 0 | 0 | AS,WN |
| May 2025 | 58 | 23 | 0 | 0 | AS |
| Apr 2025 | 36 | 17 | 1 | 0 | AS |
| Mar 2025 | 31 | 8 | 0 | 0 | AS |
| Dec 2024 | 54 | 12 | 0 | 0 | AS |
| Nov 2024 | 50 | 10 | 0 | 0 | AS |
| Oct 2024 | 52 | 7 | 0 | 0 | AS |
| Sep 2024 | 59 | 24 | 1 | 0 | AS |
| Aug 2024 | 63 | 18 | 0 | 1 | AS,WN |
| Jul 2024 | 66 | 21 | 0 | 0 | AS,WN |
| Jun 2024 | 64 | 41 | 1 | 0 | AS,WN |
| May 2024 | 62 | 20 | 0 | 0 | AS |
| Apr 2024 | 44 | 14 | 0 | 0 | AS |
| Mar 2024 | 31 | 13 | 1 | 0 | AS |
| Dec 2023 | 31 | 6 | 1 | 0 | AS |
| Nov 2023 | 30 | 9 | 0 | 0 | AS |
| Oct 2023 | 32 | 7 | 0 | 0 | AS |
| Sep 2023 | 60 | 9 | 1 | 0 | AS |
Cancellation Rate
0.7%
9 of 1,350 flights
Diversion Rate
0.1%
2 of 1,350 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BWI - Baltimore
Full on-time, delay-cause, and seasonal performance for Baltimore, MD.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See BWI 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 BWI–SEA.
Routes with a similar on-time rate
What the Data Says About BWI to SEA
On-time performance on the BWI to SEA pairing (Baltimore to Seattle) trails a chunk of the network: 73.8% of 2,623 tracked flights arrived on schedule, with a 56.4-minute average delay on the ones that ran late. The route spans about 2,335 miles across 3 carriers. Cancellations over the trailing 24 months hit 0.7% (9 of 1,350 flights), with 0.1% diverted.
The monthly split is wide on this route: Oct 2025 posted the strongest performance at 89% on-time, while Dec 2025 came in at just 33% - a 56-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from BWI to SEA? ▼
What is the cancellation rate for BWI to SEA? ▼
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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.