OnTimeStats

Historical on-time performance

DENBUF

Denver to Buffalo

1,359 miData through Dec 2025Source: US DOT · BTS

Flights on DEN–BUF arrive on time 53% of the time over the last 12 months.

On-time rate53%arrived within 15 min
Median delay10 mintypical arrival
p90 delay90 min1 in 10 flights is worsetail 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 Airlinesbest
    On-time60%
    Median5 min
    p90105 min
    Cancel0.0%
    Flights183
  • Southwest Airlines
    On-time48%
    Median15 min
    p9090 min
    Cancel0.4%
    Flights239

Why flights run late

Delay causes

  • Airline21%
  • Weather1%
  • Air traffic (NAS)17%
  • Late aircraft61%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

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Keep exploring

Related pages

Delay predictorfor this route→DEN airportDenver→BUF airportBuffalo→Frontier Airlines on this routecarrier detail→Frontier Airlinesairline profile→

Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.