OnTimeStats

Historical on-time performance

Seattle to Austin

1,770 miData through Dec 2025Source: US DOT · BTS

Flights on SEA–AUS arrive on time 76% of the time over the last 12 months.

On-time rate76%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 2,019 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Delta Air Linesbest
    On-time80%
    Medianon time
    p9035 min
    Cancel0.8%
    Flights868
  • Alaska Airlines
    On-time72%
    Medianon time
    p9040 min
    Cancel0.4%
    Flights1,151

Why flights run late

Delay causes

  • Airline47%
  • Weather2%
  • Air traffic (NAS)26%
  • Late aircraft26%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly SEA → AUS

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 70% to 82% on time.

  • Mornings82% on time · p90 20 min · 2,065 flights
  • Early mornings82% on time · p90 30 min · 213 flights
  • Overnights78% on time · p90 25 min · 503 flights
  • Middays72% on time · p90 45 min · 1,804 flights
  • Evenings70% on time · p90 45 min · 1,494 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 71% to 82% on time.

  • Tuesdays82% on time · p90 25 min · 873 flights
  • Wednesdays81% on time · p90 30 min · 879 flights
  • Sundays76% on time · p90 35 min · 883 flights
  • Saturdays75% on time · p90 35 min · 788 flights
  • Thursdays74% on time · p90 40 min · 883 flights
  • Fridays73% on time · p90 45 min · 888 flights
  • Mondays71% on time · p90 45 min · 902 flights
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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.