Historical on-time performance
Salt Lake City to Boise
290 miData through May 2026Source: US DOT · BTS
Flights on SLC–BOI arrive on time 86% of the time over the last 12 months.
On-time rate86%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 1,694 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesbestOn-time92%Medianon timep905 minCancel0.2%Flights460
- Delta Air LinesOn-time83%Medianon timep9025 minCancel1.0%Flights1,234
Why flights run late
Delay causes
- Airline69%
- Weather7%
- Air traffic (NAS)8%
- Late aircraft16%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline77%
- Weather15%
- Air traffic (NAS)8%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 13 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 SLC → 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 — 90% on time.
- Mornings90% on time · p90 10 min · 1,078 flights
- Afternoons86% on time · p90 25 min · 1,091 flights
- Middays86% on time · p90 20 min · 1,094 flights
- Evenings85% on time · p90 25 min · 455 flights
- Overnights83% on time · p90 30 min · 1,353 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 90% on time.
- Tuesdays90% on time · p90 15 min · 725 flights
- Thursdays87% on time · p90 20 min · 733 flights
- Wednesdays87% on time · p90 25 min · 723 flights
- Saturdays86% on time · p90 20 min · 677 flights
- Mondays85% on time · p90 20 min · 736 flights
- Sundays83% on time · p90 35 min · 738 flights
- Fridays82% on time · p90 30 min · 739 flights
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