Historical on-time performance
Seattle to Missoula
389 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–MSO arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 342 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Alaska AirlinesOn-time68%Medianon timep9040 minCancel0.9%Flights342
Why flights run late
Delay causes
- Airline32%
- Weather4%
- Air traffic (NAS)23%
- Late aircraft40%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SEA → MSO
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 65% to 76% on time.
- Overnights76% on time · p90 40 min · 66 flights · limited
- Middays65% on time · p90 45 min · 633 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 60% to 71% on time.
- Tuesdays71% on time · p90 40 min · 105 flights · limited
- Saturdays71% on time · p90 40 min · 101 flights · limited
- Wednesdays68% on time · p90 45 min · 108 flights · limited
- Sundays64% on time · p90 45 min · 105 flights · limited
- Thursdays64% on time · p90 65 min · 105 flights · limited
- Mondays61% on time · p90 45 min · 106 flights · limited
- Fridays60% on time · p90 40 min · 106 flights · limited
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