Historical on-time performance
Salt Lake City to Boise
291 miData through Dec 2025Source: 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 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 1,654 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesbestOn-time93%Medianon timep905 minCancel0.4%Flights284
- Delta Air LinesOn-time84%Medianon timep9025 minCancel0.7%Flights1,370
Why flights run late
Delay causes
- Airline68%
- Weather7%
- Air traffic (NAS)8%
- Late aircraft17%
- Security0%
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 SLC → 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 — 90% on time.
- Mornings90% on time · p90 10 min · 1,080 flights
- Middays85% on time · p90 20 min · 1,094 flights
- Afternoons85% on time · p90 25 min · 1,090 flights
- Evenings84% on time · p90 25 min · 578 flights
- Overnights83% on time · p90 30 min · 1,265 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 88% on time.
- Tuesdays88% on time · p90 15 min · 738 flights
- Thursdays88% on time · p90 15 min · 739 flights
- Wednesdays86% on time · p90 30 min · 737 flights
- Saturdays86% on time · p90 20 min · 662 flights
- Mondays85% on time · p90 25 min · 749 flights
- Sundays83% on time · p90 35 min · 739 flights
- Fridays83% on time · p90 30 min · 743 flights
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