Route · GTF → SEA · 2020–2025 BTS data
Great Falls to Seattle
The GTF–SEA corridor (Great Falls, MT → Seattle, WA) runs ahead of the national average, served by 2 carriers across roughly 512 miles.
Data updated 2026-06-13
- 85.7%
- On-time
- +6.7 pts
- vs US avg
- 58 min
- Delay when late
- 1,214
- Flights
Cancelled
0.4%
Best Month
Sep 2021 93%
Worst Month
Sep 2021 93%
Distance
512 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Sep 2025 | 30 | 5 | 0 | 0 | OO |
| Mar 2025 | 31 | 3 | 0 | 0 | OO |
| Apr 2024 | 30 | 7 | 0 | 0 | OO |
| Mar 2024 | 31 | 6 | 0 | 0 | OO |
| Oct 2023 | 31 | 1 | 0 | 0 | OO |
| Sep 2023 | 30 | 6 | 0 | 0 | OO |
| Aug 2023 | 31 | 8 | 0 | 0 | OO |
| Jul 2023 | 31 | 3 | 0 | 0 | OO |
| Jun 2023 | 30 | 0 | 0 | 0 | OO |
| May 2023 | 31 | 4 | 0 | 0 | OO |
| Apr 2023 | 30 | 3 | 0 | 0 | OO |
| Dec 2022 | 31 | 12 | 1 | 0 | QX |
| Oct 2022 | 31 | 4 | 0 | 0 | QX |
| Sep 2022 | 30 | 7 | 0 | 0 | QX |
| Aug 2022 | 31 | 4 | 0 | 0 | QX |
| Jul 2022 | 31 | 8 | 0 | 0 | QX |
| Jun 2022 | 30 | 6 | 0 | 0 | QX |
| May 2022 | 31 | 8 | 0 | 0 | QX |
| Apr 2022 | 30 | 7 | 1 | 2 | QX |
| Mar 2022 | 31 | 5 | 0 | 0 | QX |
| Jan 2022 | 31 | 9 | 0 | 0 | QX |
| Nov 2021 | 30 | 7 | 0 | 0 | QX |
| Oct 2021 | 37 | 6 | 0 | 0 | QX |
| Sep 2021 | 60 | 4 | 1 | 0 | QX |
Cancellation Rate
0.4%
3 of 770 flights
Diversion Rate
0.3%
2 of 770 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
GTF - Great Falls
Full on-time, delay-cause, and seasonal performance for Great Falls, MT.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See GTF 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 GTF–SEA.
Routes with a similar on-time rate
Routes of a similar trip length
What the Data Says About GTF to SEA
Great Falls to Seattle (GTF to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.7% on-time rate across 1,214 flights, with delays that do happen averaging 58.2 minutes. The corridor runs roughly 512 miles and is served by 2 carriers. Over the most recent 24 months, 3 of 770 flights were cancelled (0.4%) and 2 diverted (0.3%).
Monthly performance data for this route did not show a clear best/worst split in the sample window; review the monthly table above for period-by-period detail.
Frequently Asked Questions
How often are flights delayed from GTF to SEA? ▼
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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.