Bellingham (BLI) to Seattle (SEA): On-Time Performance
Data through July 2026
When you fly BLI to SEA matters as much as anything else about the booking: the route swung from 91% on-time in April 2026 to just 54% in September 2024. Across the full period the route averages 80% on-time against a national 78%.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 3.3
- last 12 months
- Duration
- 55m
- scheduled
- Distance
- 93 mi
Monthly on-time trend
Best time to fly from BLI to SEA
Aim for departures around 6 a.m. (93% on-time); avoid 12 p.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 12 min |
| Tuesday | 81% | 10 min |
| Wednesday | 81% | 14 min |
| Thursday | 78% | 12 min |
| Friday | 76% | 17 min |
| Saturdaybest | 82% | 12 min |
| Sunday | 81% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft38%
- Airline operations37%
- National airspace system16%
- Weather8%
Frequently asked questions
- How often are flights from BLI to SEA delayed?
- 20% of BLI–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 13 minutes.
- What is the best time of day to fly from BLI to SEA?
- Departures around 6 a.m. have the best record (93% on-time), while departures around 12 p.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BLI to SEA?
- The scheduled BLI–SEA flight time averages 55m over 93 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are BLI to SEA flights cancelled?
- 1.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from BLI to SEA?
- September 2024 was the roughest month in this dataset, with only 54% of arrivals on time. The best was April 2026 at 91%. If your dates are flexible, that 37-point gap is worth planning around.
Explore related pages
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Based on 2,509 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.