Historical on-time performance
Seattle to Boise
399 miData through May 2026Source: US DOT · BTS
Flights on SEA–BOI arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 4,028 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesbestOn-time86%Medianon timep9020 minCancel0.2%Flights3,168
- Alaska AirlinesOn-time79%Medianon timep9030 minCancel0.5%Flights860
Why flights run late
Delay causes
- Airline47%
- Weather13%
- Air traffic (NAS)14%
- Late aircraft25%
- Security1%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline18%
- Weather64%
- Air traffic (NAS)18%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 11 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 SEA → 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 — 89% on time.
- Mornings89% on time · p90 15 min · 1,997 flights
- Afternoons85% on time · p90 20 min · 1,549 flights
- Evenings83% on time · p90 25 min · 2,955 flights
- Middays82% on time · p90 25 min · 3,688 flights
- Overnights81% on time · p90 35 min · 1,761 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 80% to 87% on time.
- Tuesdays87% on time · p90 15 min · 1,662 flights
- Saturdays87% on time · p90 20 min · 1,601 flights
- Wednesdays86% on time · p90 20 min · 1,663 flights
- Mondays83% on time · p90 25 min · 1,760 flights
- Fridays82% on time · p90 25 min · 1,753 flights
- Sundays82% on time · p90 30 min · 1,748 flights
- Thursdays80% on time · p90 25 min · 1,763 flights
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