SEA (Seattle) to MSO (Missoula) flights arrive on time 67% of the time. The most reliable airline on this route is Alaska Airlines at 66%. The average delay is 44 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.SEA → MSO
SEA (Seattle) to MSO (Missoula)
SEA → MSO on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 67% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Accurate?
Good to know
Departing from SEA
82% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at MSO
82% on timeWhen flights into MSO are late, the average delay is 75 minutes. Build buffer if you have ground plans.
If connecting at MSO: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.