Route · MSO → SEA · 2020–2025 BTS data
Missoula to Seattle
The MSO–SEA corridor (Missoula, MT → Seattle, WA) runs ahead of the national average, served by 2 carriers across roughly 389 miles.
Data updated 2026-06-13
- 80%
- On-time
- +1 pts
- vs US avg
- 61 min
- Delay when late
- 2,926
- Flights
Cancelled
1.3%
Best Month
Oct 2022 93%
Worst Month
Dec 2022 57%
Distance
389 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 61 | 16 | 0 | 0 | AS |
| Nov 2025 | 59 | 11 | 2 | 0 | AS |
| Oct 2025 | 36 | 4 | 0 | 0 | AS |
| Aug 2025 | 31 | 15 | 0 | 0 | AS |
| Jul 2025 | 31 | 14 | 0 | 0 | AS |
| Jun 2025 | 30 | 9 | 0 | 0 | AS |
| May 2025 | 31 | 10 | 0 | 0 | AS |
| Apr 2025 | 30 | 6 | 0 | 0 | AS |
| Jan 2025 | 31 | 11 | 1 | 0 | AS |
| Oct 2024 | 31 | 11 | 0 | 0 | AS |
| Aug 2024 | 31 | 8 | 0 | 0 | AS |
| Jul 2024 | 31 | 6 | 0 | 0 | AS |
| Jun 2024 | 30 | 8 | 0 | 0 | AS |
| Dec 2022 | 100 | 43 | 12 | 2 | QX |
| Nov 2022 | 106 | 37 | 0 | 1 | QX |
| Oct 2022 | 119 | 8 | 0 | 0 | QX |
| Sep 2022 | 138 | 22 | 0 | 0 | QX |
| Aug 2022 | 93 | 16 | 0 | 0 | QX |
| Jul 2022 | 93 | 17 | 0 | 0 | QX |
| Jun 2022 | 90 | 16 | 0 | 0 | QX |
| May 2022 | 93 | 19 | 2 | 0 | QX |
| Apr 2022 | 60 | 7 | 1 | 0 | QX |
| Mar 2022 | 77 | 11 | 1 | 0 | QX |
| Feb 2022 | 84 | 9 | 1 | 0 | QX |
Cancellation Rate
1.3%
20 of 1,516 flights
Diversion Rate
0.2%
3 of 1,516 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
MSO - Missoula
Full on-time, delay-cause, and seasonal performance for Missoula, MT.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See MSO 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 MSO–SEA.
Routes with a similar on-time rate
What the Data Says About MSO to SEA
2,926 tracked flights put the MSO to SEA pairing (Missoula to Seattle) at a 80% on-time rate, squarely in line with the wider network. Delays that do occur run 60.7 minutes on average. Across the 389-mile route and its 2 carriers, the trailing 24 months show 1.3% cancelled and 0.2% diverted (1,516 flights sampled).
The monthly split is wide on this route: Oct 2022 posted the strongest performance at 93% on-time, while Dec 2022 came in at just 57% - a 36-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.