Historical on-time performance
Billings to Chicago
1,060 miData through May 2026Source: US DOT · BTS
Flights on BIL–ORD arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 393 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- Envoy AirOn-time76%Medianon timep9050 minCancel0.4%Flights271
- SkyWest AirlinesOn-time75%Medianon timep9040 minCancel0.0%Flights122
Why flights run late
Delay causes
- Airline66%
- Weather4%
- Air traffic (NAS)17%
- Late aircraft13%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather0%
- Air traffic (NAS)100%
- Security0%
Most cancellations here are attributed to Air traffic (NAS). Shares are among 1 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 BIL → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 123 flights · limited
- Middays74% on time · p90 50 min · 516 flights
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