Historical on-time performance
Seattle to Boise
399 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–BOI arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 3,954 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesbestOn-time85%Medianon timep9020 minCancel0.1%Flights3,222
- Alaska AirlinesOn-time69%Medianon timep9035 minCancel0.8%Flights732
Why flights run late
Delay causes
- Airline42%
- Weather15%
- Air traffic (NAS)15%
- Late aircraft28%
- Security1%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SEA → 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 — 89% on time.
- Mornings89% on time · p90 15 min · 2,046 flights
- Afternoons86% on time · p90 20 min · 1,717 flights
- Evenings83% on time · p90 25 min · 2,988 flights
- Middays82% on time · p90 25 min · 3,681 flights
- Overnights81% on time · p90 30 min · 1,810 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 81% to 87% on time.
- Tuesdays87% on time · p90 15 min · 1,714 flights
- Saturdays87% on time · p90 20 min · 1,642 flights
- Wednesdays87% on time · p90 20 min · 1,727 flights
- Mondays83% on time · p90 25 min · 1,800 flights
- Fridays82% on time · p90 25 min · 1,783 flights
- Sundays82% on time · p90 25 min · 1,786 flights
- Thursdays81% on time · p90 25 min · 1,790 flights
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