Historical on-time performance
Chicago to Bozeman
1,186 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–BZN arrive on time 71% of the time over the last 12 months.
On-time rate71%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 862 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- American AirlinesOn-time70%Medianon timep9045 minCancel0.0%Flights296
- United AirlinesOn-time72%Medianon timep9050 minCancel1.4%Flights566
Why flights run late
Delay causes
- Airline31%
- Weather1%
- Air traffic (NAS)17%
- Late aircraft51%
- 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 → BZN
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 62% to 82% on time.
- Mornings82% on time · p90 25 min · 1,447 flights
- Afternoons76% on time · p90 45 min · 121 flights · limited
- Middays73% on time · p90 45 min · 641 flights
- Evenings62% on time · p90 75 min · 281 flights
- Overnights62% on time · p90 65 min · 241 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 68% to 81% on time.
- Tuesdays81% on time · p90 35 min · 341 flights
- Mondays79% on time · p90 40 min · 375 flights
- Thursdays78% on time · p90 35 min · 396 flights
- Saturdays77% on time · p90 40 min · 426 flights
- Wednesdays76% on time · p90 40 min · 372 flights
- Sundays71% on time · p90 45 min · 402 flights
- Fridays68% on time · p90 50 min · 419 flights
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