OnTimeStats

Historical on-time performance

Denver to Washington

1,452 miData through Dec 2025Source: US DOT · BTS

Flights on DEN–IAD arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
Median delayon timetypical arrival
p90 delay40 min1 in 10 flights is worsetail risk
Cancelled0.4%of scheduled flights

based on 3,559 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time81%
    Medianon time
    p9030 min
    Cancel0.4%
    Flights2,660
  • Southwest Airlines
    On-time67%
    Medianon time
    p9055 min
    Cancel0.6%
    Flights899

Why flights run late

Delay causes

  • Airline33%
  • Weather2%
  • Air traffic (NAS)19%
  • Late aircraft46%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

Advertisement

Keep exploring

Related pages

Delay predictorfor this route→DEN airportDenver→IAD airportWashington→United Airlines on this routecarrier detail→United 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.