OnTimeStats

Airport on-time performance

SEA

Seattle

Data through Dec 2025Source: US DOT · BTS
On-time rate77%flights departing here that arrived on time
Median delayon timetypical departure delay
p90 delay35 min1 in 10 departures is worsetail risk
Cancelled0.8%of scheduled departures
Left the gate on time79%departures that pushed back within 15 min of schedule (DepDel15)

based on 164,835 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

As a connection hub

Arriving here (inbound performance)

These figures reflect inbound flights arriving at this airport — relevant for connections and layovers.

78%arrived on time here
(within 15 min, inbound flights)
  • On time78%
  • 15–59 min late15%
  • 1–2 hr late4%
  • 2 hr+ late2%
  • Cancelled or diverted1%

Arrival outcomes for inbound flights. Last segment = cancelled or diverted.

Bad day: 1 in 10 flights arrives more than 35 min late.

By airline

Carriers departing here (last 12 months)

Delay = arrival delay (ArrDel15-based)

  • SkyWest Airlinesbest
    On-time85%
    Medianon time
    p9020 min
    Cancel0.5%
    Flights28,289
  • Delta Air Lines
    On-time82%
    Medianon time
    p9030 min
    Cancel0.6%
    Flights30,960
  • Spirit Airlines
    On-time81%
    Medianon time
    p9025 min
    Cancel0.4%
    Flights266
  • United Airlines
    On-time81%
    Medianon time
    p9035 min
    Cancel0.6%
    Flights9,086
  • Envoy Air
    On-time79%
    Medianon time
    p9035 min
    Cancel0.0%
    Flights296
  • American Airlines
    On-time77%
    Medianon time
    p9040 min
    Cancel1.7%
    Flights5,909
  • Southwest Airlines
    On-time73%
    Medianon time
    p9040 min
    Cancel0.3%
    Flights7,879
  • Alaska Airlines
    On-time72%
    Medianon time
    p9040 min
    Cancel1.0%
    Flights73,687
  • Frontier Airlines
    On-time70%
    Medianon time
    p9060 min
    Cancel2.2%
    Flights490
  • JetBlue Airways
    On-time62%
    Medianon time
    p9090 min
    Cancel1.5%
    Flights481
  • Hawaiian Airlines
    On-time62%
    Median5 min
    p9060 min
    Cancel1.1%
    Flights1,617

Over time

Departure on-time trend

By season

On-time rate by month

Where flights go

Busiest routes

SEA → LAX→SEA → SFO→SEA → ANC→SEA → DEN→SEA → PHX→SEA → LAS→SEA → ORD→SEA → GEG→SEA → DFW→SEA → SJC→
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Will you make a connection at SEA? →

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.