Historical on-time performance
San Francisco to Boise
522 miData through May 2026Source: US DOT · BTS
Flights on SFO–BOI arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 1,657 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time85%Medianon timep9020 minCancel0.5%Flights217
- SkyWest AirlinesOn-time77%Medianon timep9045 minCancel0.3%Flights1,440
Why flights run late
Delay causes
- Airline29%
- Weather4%
- Air traffic (NAS)29%
- Late aircraft38%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather60%
- Air traffic (NAS)40%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 5 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 SFO → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 798 flights
- Afternoons81% on time · p90 35 min · 997 flights
- Middays78% on time · p90 45 min · 1,138 flights
- Evenings78% on time · p90 50 min · 1,548 flights
- Overnights75% on time · p90 40 min · 276 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 83% on time.
- Wednesdays83% on time · p90 35 min · 676 flights
- Saturdays83% on time · p90 30 min · 663 flights
- Tuesdays81% on time · p90 35 min · 669 flights
- Sundays79% on time · p90 40 min · 672 flights
- Thursdays79% on time · p90 35 min · 685 flights
- Fridays78% on time · p90 40 min · 697 flights
- Mondays76% on time · p90 50 min · 695 flights
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