Historical on-time performance
Buffalo to Denver
1,359 miData through Dec 2025Source: US DOT · BTS
Flights on BUF–DEN arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 422 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time89%Medianon timep9015 minCancel0.5%Flights183
- Southwest AirlinesOn-time80%Medianon timep9030 minCancel0.0%Flights239
Why flights run late
Delay causes
- Airline44%
- Weather3%
- Air traffic (NAS)28%
- Late aircraft25%
- 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 BUF → DEN
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 59% to 88% on time.
- Mornings88% on time · p90 15 min · 498 flights
- Middays85% on time · p90 20 min · 413 flights
- Overnights63% on time · p90 55 min · 54 flights · limited
- Afternoons60% on time · p90 50 min · 244 flights
- Evenings59% on time · p90 100 min · 138 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 65% to 86% on time.
- Tuesdays86% on time · p90 15 min · 153 flights · limited
- Thursdays84% on time · p90 25 min · 174 flights · limited
- Wednesdays84% on time · p90 20 min · 164 flights · limited
- Sundays79% on time · p90 30 min · 197 flights · limited
- Fridays77% on time · p90 35 min · 212 flights
- Mondays77% on time · p90 45 min · 211 flights
- Saturdays65% on time · p90 45 min · 236 flights
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