Route · SEA → MSO · 2020–2025 BTS data
Seattle to Missoula
The SEA–MSO corridor (Seattle, WA → Missoula, MT) runs ahead of the national average, served by 2 carriers across roughly 389 miles.
Data updated 2026-06-13
- 82.2%
- On-time
- +3.2 pts
- vs US avg
- 51 min
- Delay when late
- 2,929
- Flights
Cancelled
1.1%
Best Month
Oct 2022 97%
Worst Month
Dec 2022 68%
Distance
389 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 62 | 12 | 0 | 0 | AS |
| Nov 2025 | 59 | 10 | 2 | 0 | AS |
| Oct 2025 | 37 | 5 | 0 | 0 | AS |
| Aug 2025 | 31 | 14 | 0 | 0 | AS |
| Jul 2025 | 31 | 11 | 0 | 1 | AS |
| Jun 2025 | 30 | 10 | 0 | 0 | AS |
| May 2025 | 31 | 18 | 0 | 0 | AS |
| Apr 2025 | 30 | 12 | 0 | 0 | AS |
| Jan 2025 | 31 | 15 | 1 | 0 | AS |
| Oct 2024 | 31 | 12 | 0 | 0 | AS |
| Aug 2024 | 31 | 14 | 0 | 0 | AS |
| Jul 2024 | 31 | 10 | 0 | 0 | AS |
| Jun 2024 | 30 | 12 | 0 | 0 | AS |
| Dec 2022 | 101 | 32 | 12 | 0 | QX |
| Nov 2022 | 106 | 19 | 0 | 0 | QX |
| Oct 2022 | 119 | 4 | 0 | 0 | QX |
| Sep 2022 | 138 | 17 | 0 | 1 | QX |
| Aug 2022 | 93 | 14 | 0 | 0 | QX |
| Jul 2022 | 93 | 17 | 0 | 0 | QX |
| Jun 2022 | 90 | 18 | 0 | 0 | QX |
| May 2022 | 93 | 19 | 0 | 0 | QX |
| Apr 2022 | 60 | 8 | 0 | 1 | QX |
| Mar 2022 | 77 | 10 | 0 | 0 | QX |
| Feb 2022 | 84 | 13 | 1 | 0 | QX |
Cancellation Rate
1.1%
16 of 1,519 flights
Diversion Rate
0.2%
3 of 1,519 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 →MSO - Missoula
Full on-time, delay-cause, and seasonal performance for Missoula, MT.
Destination airport →Compare the two airports
See SEA and MSO 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–MSO.
Routes with a similar on-time rate
What the Data Says About SEA to MSO
Bureau of Transportation Statistics records show Seattle to Missoula (SEA to MSO) running a 82.2% on-time rate over 2,929 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 50.8 minutes. The 389-mile corridor is served by 2 carriers, and over the last 24 months 1.1% of 1,519 flights were cancelled, 0.2% diverted.
The monthly split is wide on this route: Oct 2022 posted the strongest performance at 97% on-time, while Dec 2022 came in at just 68% - a 28-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from SEA to MSO? ▼
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Flight Guides
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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.