Route · SEA → BLI · 2020–2025 BTS data
Seattle to Bellingham
The SEA–BLI corridor (Seattle, WA → Bellingham, WA) runs ahead of the national average, served by 2 carriers across roughly 93 miles.
Data updated 2026-06-13
- 85.1%
- On-time
- +6.1 pts
- vs US avg
- 51 min
- Delay when late
- 5,958
- Flights
Cancelled
1.4%
Best Month
Dec 2024 94%
Worst Month
Jun 2025 71%
Distance
93 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 124 | 29 | 3 | 0 | OO |
| Nov 2025 | 97 | 13 | 10 | 0 | OO |
| Oct 2025 | 116 | 16 | 2 | 0 | OO |
| Sep 2025 | 120 | 18 | 0 | 0 | OO |
| Aug 2025 | 124 | 23 | 1 | 0 | OO |
| Jul 2025 | 124 | 23 | 1 | 0 | OO |
| Jun 2025 | 119 | 35 | 0 | 0 | OO |
| May 2025 | 119 | 25 | 0 | 0 | OO |
| Apr 2025 | 96 | 14 | 0 | 0 | OO |
| Mar 2025 | 103 | 27 | 1 | 0 | OO |
| Feb 2025 | 105 | 30 | 3 | 0 | OO |
| Jan 2025 | 113 | 16 | 5 | 0 | OO |
| Dec 2024 | 82 | 5 | 4 | 0 | OO |
| Nov 2024 | 83 | 10 | 1 | 0 | OO |
| Oct 2024 | 88 | 14 | 0 | 0 | OO |
| Sep 2024 | 85 | 24 | 1 | 0 | OO |
| Aug 2024 | 88 | 24 | 0 | 0 | OO |
| Jul 2024 | 88 | 22 | 0 | 0 | OO |
| Jun 2024 | 85 | 20 | 0 | 0 | OO |
| May 2024 | 83 | 11 | 0 | 0 | OO |
| Apr 2024 | 83 | 15 | 0 | 0 | OO |
| Mar 2024 | 80 | 8 | 0 | 0 | OO |
| Feb 2024 | 58 | 5 | 0 | 0 | OO |
| Jan 2024 | 62 | 8 | 0 | 0 | OO |
Cancellation Rate
1.4%
32 of 2,325 flights
Diversion Rate
0.0%
0 of 2,325 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 →BLI - Bellingham
Full on-time, delay-cause, and seasonal performance for Bellingham, WA.
Destination airport →Compare the two airports
See SEA and BLI 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–BLI.
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What the Data Says About SEA to BLI
Seattle to Bellingham (SEA to BLI) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.1% on-time rate across 5,958 flights, with delays that do happen averaging 51.4 minutes. The corridor runs roughly 93 miles and is served by 2 carriers. Over the most recent 24 months, 32 of 2,325 flights were cancelled (1.4%) and 0 diverted (0.0%).
The monthly split is wide on this route: Dec 2024 posted the strongest performance at 94% on-time, while Jun 2025 came in at just 71% - a 23-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from SEA to BLI? ▼
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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.