Seattle (SEA) to Great Falls (GTF): On-Time Performance
Data through May 2026
Seattle (SEA) to Great Falls (GTF) is a thinner route than most in this dataset — 117 departures over the past year, roughly 2 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 82% arrived on time.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 0.32
- last 12 months
- Duration
- 1h 38m
- scheduled
- Distance
- 512 mi
Monthly on-time trend
Best time to fly from SEA to GTF
Aim for departures around 11 a.m. (100% on-time); avoid 1 p.m. departures (75%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 13 min |
| Tuesday | 83% | 9 min |
| Wednesdaybest | 88% | 6 min |
| Thursday | 86% | 8 min |
| Friday | 80% | 14 min |
| Saturday | 77% | 16 min |
| Sunday | 86% | 9 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft41%
- Airline operations40%
- National airspace system18%
- Weather2%
Frequently asked questions
- How often are flights from SEA to GTF delayed?
- 18% of SEA–GTF 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 11 minutes.
- What is the best time of day to fly from SEA to GTF?
- Departures around 11 a.m. have the best record (100% on-time), while departures around 1 p.m. have the worst (75%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to GTF?
- The scheduled SEA–GTF flight time averages 1h 38m over 512 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are SEA to GTF flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What day of the week is most reliable for SEA to GTF?
- Wednesday flights have the best record at 88% on-time. Day-of-week differences on this route are meaningful — Monday trails at 75%.
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Based on 240 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.