Historical on-time performance
San Francisco to Boise
522 miData through Dec 2025Source: US DOT · BTS
Flights on SFO–BOI arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.1%of scheduled flights
based on 1,450 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-time80%Medianon timep9040 minCancel0.1%Flights1,172
- United AirlinesOn-time83%Medianon timep9030 minCancel0.4%Flights278
Why flights run late
Delay causes
- Airline28%
- Weather3%
- Air traffic (NAS)25%
- Late aircraft43%
- 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 SFO → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 864 flights
- Afternoons81% on time · p90 30 min · 1,056 flights
- Middays79% on time · p90 45 min · 1,084 flights
- Evenings78% on time · p90 45 min · 1,380 flights
- Overnights72% on time · p90 40 min · 188 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 83% on time.
- Wednesdays83% on time · p90 30 min · 658 flights
- Saturdays82% on time · p90 30 min · 622 flights
- Tuesdays81% on time · p90 35 min · 647 flights
- Thursdays80% on time · p90 30 min · 662 flights
- Sundays80% on time · p90 40 min · 635 flights
- Fridays79% on time · p90 35 min · 668 flights
- Mondays78% on time · p90 40 min · 680 flights
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