Route · BLI → SEA · 2020–2025 BTS data
Bellingham to Seattle
The BLI–SEA corridor (Bellingham, WA → Seattle, WA) runs ahead of the national average, served by 2 carriers across roughly 93 miles.
Data updated 2026-06-13
- 84.5%
- On-time
- +5.5 pts
- vs US avg
- 65 min
- Delay when late
- 5,955
- Flights
Cancelled
1.3%
Best Month
Nov 2025 92%
Worst Month
Sep 2024 54%
Distance
93 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 124 | 31 | 2 | 1 | OO |
| Nov 2025 | 96 | 8 | 10 | 0 | OO |
| Oct 2025 | 117 | 21 | 2 | 0 | OO |
| Sep 2025 | 120 | 20 | 0 | 0 | OO |
| Aug 2025 | 124 | 17 | 1 | 0 | OO |
| Jul 2025 | 124 | 19 | 1 | 0 | OO |
| Jun 2025 | 119 | 33 | 0 | 0 | OO |
| May 2025 | 119 | 18 | 0 | 0 | OO |
| Apr 2025 | 95 | 18 | 0 | 0 | OO |
| Mar 2025 | 104 | 21 | 1 | 0 | OO |
| Feb 2025 | 104 | 34 | 2 | 0 | OO |
| Jan 2025 | 113 | 27 | 5 | 1 | OO |
| Dec 2024 | 82 | 13 | 4 | 0 | OO |
| Nov 2024 | 83 | 14 | 1 | 0 | OO |
| Oct 2024 | 88 | 18 | 0 | 0 | OO |
| Sep 2024 | 85 | 39 | 1 | 0 | OO |
| Aug 2024 | 88 | 28 | 1 | 0 | OO |
| Jul 2024 | 88 | 15 | 0 | 0 | OO |
| Jun 2024 | 85 | 21 | 0 | 0 | OO |
| May 2024 | 83 | 10 | 0 | 0 | OO |
| Apr 2024 | 83 | 16 | 0 | 0 | OO |
| Mar 2024 | 80 | 17 | 0 | 0 | OO |
| Feb 2024 | 58 | 9 | 0 | 0 | OO |
| Jan 2024 | 62 | 24 | 0 | 0 | OO |
Cancellation Rate
1.3%
31 of 2,324 flights
Diversion Rate
0.1%
2 of 2,324 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BLI - Bellingham
Full on-time, delay-cause, and seasonal performance for Bellingham, WA.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See BLI 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 BLI–SEA.
Routes with a similar on-time rate
What the Data Says About BLI to SEA
Bureau of Transportation Statistics records show Bellingham to Seattle (BLI to SEA) running a 84.5% on-time rate over 5,955 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 64.5 minutes. The 93-mile corridor is served by 2 carriers, and over the last 24 months 1.3% of 2,324 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Nov 2025 posted the strongest performance at 92% on-time, while Sep 2024 came in at just 54% - a 38-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.