OnTimeStats

Historical on-time performance

Atlanta to Seattle

2,182 miData through Dec 2025Source: US DOT · BTS

Flights on ATL–SEA arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights

based on 3,251 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Alaska Airlines
    On-time66%
    Medianon time
    p9055 min
    Cancel1.1%
    Flights888
  • Delta Air Linesbest
    On-time81%
    Medianon time
    p9030 min
    Cancel0.7%
    Flights2,363

Why flights run late

Delay causes

  • Airline45%
  • Weather10%
  • Air traffic (NAS)24%
  • Late aircraft21%
  • Security1%

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 ATL → SEA

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 69% to 86% on time.

  • Middays86% on time · p90 20 min · 1,923 flights
  • Mornings84% on time · p90 20 min · 3,647 flights
  • Afternoons80% on time · p90 30 min · 1,548 flights
  • Overnights78% on time · p90 40 min · 969 flights
  • Evenings69% on time · p90 50 min · 2,226 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 76% to 83% on time.

  • Wednesdays83% on time · p90 25 min · 1,391 flights
  • Tuesdays82% on time · p90 30 min · 1,392 flights
  • Mondays81% on time · p90 25 min · 1,547 flights
  • Thursdays81% on time · p90 30 min · 1,526 flights
  • Saturdays81% on time · p90 35 min · 1,395 flights
  • Fridays78% on time · p90 30 min · 1,535 flights
  • Sundays76% on time · p90 35 min · 1,527 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.