Historical on-time performance
Chicago to Missoula
1,332 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–MSO arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 312 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Envoy AirOn-time75%Medianon timep9045 minCancel0.5%Flights220
- United AirlinesbestOn-time87%Medianon timep9020 minCancel0.0%Flights92
Why flights run late
Delay causes
- Airline28%
- Weather24%
- Air traffic (NAS)20%
- Late aircraft28%
- 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 ORD → 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 66% to 81% on time.
- Mornings81% on time · p90 30 min · 668 flights
- Middays79% on time · p90 50 min · 53 flights · limited
- Overnights66% on time · p90 75 min · 108 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 87% on time.
- Tuesdays87% on time · p90 35 min · 113 flights · limited
- Thursdays81% on time · p90 30 min · 121 flights · limited
- Saturdays79% on time · p90 25 min · 122 flights · limited
- Wednesdays79% on time · p90 45 min · 117 flights · limited
- Fridays78% on time · p90 30 min · 121 flights · limited
- Mondays78% on time · p90 35 min · 121 flights · limited
- Sundays74% on time · p90 50 min · 121 flights · limited
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