Historical on-time performance
Denver to Boise
649 miData through Dec 2025Source: US DOT · BTS
Flights on DEN–BOI arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 2,915 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- SkyWest AirlinesOn-time75%Medianon timep9040 minCancel0.3%Flights733
- United AirlinesOn-time79%Medianon timep9035 minCancel0.3%Flights1,085
- Southwest AirlinesOn-time70%Medianon timep9050 minCancel0.2%Flights1,097
Why flights run late
Delay causes
- Airline31%
- Weather5%
- Air traffic (NAS)14%
- Late aircraft50%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly DEN → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 2,131 flights
- Middays81% on time · p90 30 min · 1,360 flights
- Afternoons74% on time · p90 40 min · 1,753 flights
- Evenings67% on time · p90 65 min · 1,354 flights
- Overnights59% on time · p90 75 min · 1,490 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 78% on time.
- Tuesdays78% on time · p90 40 min · 1,157 flights
- Wednesdays78% on time · p90 40 min · 1,155 flights
- Sundays76% on time · p90 40 min · 1,209 flights
- Mondays76% on time · p90 45 min · 1,160 flights
- Fridays74% on time · p90 45 min · 1,155 flights
- Saturdays72% on time · p90 45 min · 1,086 flights
- Thursdays72% on time · p90 45 min · 1,166 flights
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