Historical on-time performance
Bozeman to Chicago
1,186 miData through May 2026Source: US DOT · BTS
Flights on BZN–ORD arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 1,042 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time80%Medianon timep9040 minCancel1.4%Flights628
- American AirlinesOn-time62%Medianon timep9090 minCancel0.7%Flights414
Why flights run late
Delay causes
- Airline23%
- Weather5%
- Air traffic (NAS)32%
- Late aircraft40%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline42%
- Weather58%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 12 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BZN → ORD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 20 min · 727 flights
- Middays75% on time · p90 55 min · 1,820 flights
- Afternoons64% on time · p90 95 min · 313 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 80% on time.
- Tuesdays80% on time · p90 50 min · 357 flights
- Wednesdays79% on time · p90 40 min · 350 flights
- Mondays79% on time · p90 40 min · 416 flights
- Saturdays78% on time · p90 50 min · 451 flights
- Thursdays76% on time · p90 45 min · 407 flights
- Fridays75% on time · p90 55 min · 419 flights
- Sundays72% on time · p90 55 min · 460 flights
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