OnTimeStats

Historical on-time performance

Seattle to Portland

129 miData through Dec 2025Source: US DOT · BTS

Flights on SEA–PDX arrive on time 80% of the time over the last 12 months.

On-time rate80%arrived within 15 min
Median delayon timetypical arrival
p90 delay30 min1 in 10 flights is worsetail risk
Cancelled0.7%of scheduled flights

based on 4,736 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlinesbest
    On-time84%
    Medianon time
    p9020 min
    Cancel0.5%
    Flights3,317
  • Delta Air Lines
    On-time78%
    Medianon time
    p9030 min
    Cancel0.0%
    Flights299
  • Alaska Airlines
    On-time69%
    Medianon time
    p9040 min
    Cancel1.5%
    Flights1,120

Why flights run late

Delay causes

  • Airline46%
  • Weather10%
  • Air traffic (NAS)15%
  • Late aircraft28%
  • Security1%

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→SEA airportSeattle→PDX airportPortland→SkyWest Airlines on this routecarrier detail→SkyWest 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.