Historical on-time performance
Boise to Denver
649 miData through May 2026Source: US DOT · BTS
Flights on BOI–DEN arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 2,914 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 timep9030 minCancel0.0%Flights862
- United AirlinesOn-time79%Medianon timep9050 minCancel0.5%Flights955
- Southwest AirlinesOn-time77%Medianon timep9035 minCancel0.2%Flights1,097
Why flights run late
Delay causes
- Airline30%
- Weather4%
- Air traffic (NAS)39%
- Late aircraft27%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline43%
- Weather29%
- Air traffic (NAS)29%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 7 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 BOI → DEN
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 — 92% on time.
- Mornings92% on time · p90 5 min · 2,973 flights
- Middays86% on time · p90 20 min · 2,288 flights
- Afternoons72% on time · p90 65 min · 1,836 flights
- Evenings70% on time · p90 65 min · 1,414 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 85% on time.
- Wednesdays85% on time · p90 25 min · 1,204 flights
- Mondays83% on time · p90 30 min · 1,211 flights
- Saturdays83% on time · p90 30 min · 1,137 flights
- Sundays83% on time · p90 30 min · 1,287 flights
- Tuesdays83% on time · p90 35 min · 1,208 flights
- Thursdays80% on time · p90 40 min · 1,247 flights
- Fridays78% on time · p90 40 min · 1,224 flights
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