Seattle (SEA) to Bellingham (BLI): On-Time Performance
Data through May 2026
When you fly SEA to BLI matters as much as anything else about the booking: the route swung from 94% on-time in December 2024 to just 71% in February 2025. Across the full period the route averages 82% on-time against a national 78%.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 3.5
- last 12 months
- Duration
- 54m
- scheduled
- Distance
- 93 mi
Monthly on-time trend
Best time to fly from SEA to BLI
Aim for departures around 10 a.m. (89% on-time); avoid 9 p.m. departures (69%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 11 min |
| Tuesdaybest | 86% | 7 min |
| Wednesday | 85% | 8 min |
| Thursday | 80% | 10 min |
| Friday | 77% | 12 min |
| Saturday | 83% | 9 min |
| Sunday | 79% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft57%
- Airline operations21%
- National airspace system16%
- Weather5%
- Security1%
Frequently asked questions
- How often are flights from SEA to BLI delayed?
- 19% of SEA–BLI flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 10 minutes.
- What is the best time of day to fly from SEA to BLI?
- Departures around 10 a.m. have the best record (89% on-time), while departures around 9 p.m. have the worst (69%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to BLI?
- The scheduled SEA–BLI flight time averages 54m over 93 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are SEA to BLI flights cancelled?
- 1.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from SEA to BLI?
- February 2025 was the roughest month in this dataset, with only 71% of arrivals on time. The best was December 2024 at 94%. If your dates are flexible, that 23-point gap is worth planning around.
Explore related pages
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Based on 2,411 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.