Historical on-time performance
Denver to Buffalo
Flights on DEN–BUF arrive on time 61% of the time over the last 12 months.
based on 453 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- United AirlinesOn-time67%Medianon timep9090 minCancel0.0%Flights275
- Southwest AirlinesOn-time53%Median10 minp9080 minCancel0.6%Flights178
Why flights run late
Delay causes
- Airline22%
- Weather2%
- Air traffic (NAS)19%
- Late aircraft58%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather100%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 1 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 DEN → BUF
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 54% to 79% on time.
- Mornings79% on time · p90 20 min · 149 flights · limited
- Middays73% on time · p90 40 min · 249 flights
- Afternoons63% on time · p90 45 min · 122 flights · limited
- Evenings54% on time · p90 90 min · 857 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 53% to 69% on time.
- Saturdays69% on time · p90 45 min · 249 flights
- Wednesdays64% on time · p90 80 min · 170 flights · limited
- Sundays62% on time · p90 80 min · 201 flights
- Fridays59% on time · p90 60 min · 227 flights
- Tuesdays58% on time · p90 75 min · 156 flights · limited
- Mondays58% on time · p90 85 min · 222 flights
- Thursdays53% on time · p90 80 min · 183 flights · limited
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