OnTimeStats

Historical on-time performance

Washington to Anchorage

3,356 miData through Dec 2025Source: US DOT · BTS

Flights on IAD–ANC arrive on time 58% of the time over the last 12 months.

On-time rate58%arrived within 15 min
p90 delay80 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights

based on 91 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlines
    On-time58%
    Median5 min
    p9080 min
    Cancel1.1%
    Flights91

Why flights run late

Delay causes

  • Airline33%
  • Weather23%
  • Air traffic (NAS)25%
  • Late aircraft19%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

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Keep exploring

Related pages

Delay predictorfor this route→IAD airportWashington→ANC airportAnchorage→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.