Historical on-time performance
Chicago to Boise
1,437 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–BOI arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 750 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.
- Envoy AirOn-time81%Medianon timep9025 minCancel0.0%Flights31
- American AirlinesOn-time83%Medianon timep9030 minCancel0.0%Flights60
- SkyWest AirlinesOn-time67%Medianon timep9075 minCancel0.8%Flights475
- United AirlinesOn-time84%Medianon timep9030 minCancel0.0%Flights184
Why flights run late
Delay causes
- Airline36%
- Weather5%
- Air traffic (NAS)22%
- Late aircraft36%
- Security1%
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 → BOI
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 83% on time.
- Afternoons83% on time · p90 30 min · 78 flights · limited
- Mornings82% on time · p90 30 min · 1,284 flights
- Evenings62% on time · p90 85 min · 569 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 78% on time.
- Tuesdays78% on time · p90 45 min · 273 flights
- Saturdays78% on time · p90 40 min · 281 flights
- Thursdays76% on time · p90 50 min · 280 flights
- Fridays75% on time · p90 50 min · 284 flights
- Wednesdays75% on time · p90 65 min · 285 flights
- Mondays74% on time · p90 50 min · 274 flights
- Sundays72% on time · p90 75 min · 284 flights
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