Historical on-time performance
Chicago to Boise
1,437 miData through May 2026Source: US DOT · BTS
Flights on ORD–BOI arrive on time 67% of the time over the last 12 months.
On-time rate67%arrived within 15 min
p90 delay80 min1 in 10 flights is worse (tail risk)
Cancelled1.3%of scheduled flights
based on 870 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesOn-time82%Medianon timep9030 minCancel0.0%Flights91
- United AirlinesbestOn-time79%Medianon timep9040 minCancel0.0%Flights214
- Envoy AirOn-time65%Medianon timep9045 minCancel0.0%Flights92
- SkyWest AirlinesOn-time59%Medianon timep90100 minCancel2.3%Flights473
Why flights run late
Delay causes
- Airline40%
- Weather6%
- Air traffic (NAS)21%
- Late aircraft33%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline9%
- Weather82%
- Air traffic (NAS)9%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 11 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 ORD → BOI
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 — 80% on time.
- Mornings80% on time · p90 35 min · 1,382 flights
- Evenings60% on time · p90 85 min · 697 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 78% on time.
- Saturdays78% on time · p90 35 min · 317 flights
- Thursdays75% on time · p90 55 min · 319 flights
- Tuesdays73% on time · p90 55 min · 311 flights
- Wednesdays72% on time · p90 65 min · 319 flights
- Sundays70% on time · p90 75 min · 321 flights
- Mondays69% on time · p90 55 min · 312 flights
- Fridays69% on time · p90 65 min · 321 flights
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