Historical on-time performance
San Jose to Boise
523 miData through Dec 2025Source: US DOT · BTS
Flights on SJC–BOI arrive on time 89% of the time over the last 12 months.
On-time rate89%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 592 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.
- SkyWest AirlinesOn-time88%Medianon timep9020 minCancel0.4%Flights244
- Southwest AirlinesOn-time90%Medianon timep9015 minCancel0.0%Flights348
Why flights run late
Delay causes
- Airline19%
- Weather4%
- Air traffic (NAS)12%
- Late aircraft65%
- 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 SJC → BOI
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 93% on time.
- Mornings93% on time · p90 5 min · 317 flights
- Middays88% on time · p90 15 min · 801 flights
- Evenings84% on time · p90 30 min · 496 flights
- Afternoons75% on time · p90 35 min · 493 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 88% on time.
- Tuesdays88% on time · p90 20 min · 297 flights
- Mondays86% on time · p90 20 min · 334 flights
- Saturdays86% on time · p90 20 min · 211 flights
- Wednesdays85% on time · p90 15 min · 295 flights
- Sundays84% on time · p90 30 min · 313 flights
- Thursdays83% on time · p90 25 min · 329 flights
- Fridays82% on time · p90 25 min · 333 flights
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