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 AirlinesOn-time66%Medianon timep9055 minCancel1.1%Flights888
- Delta Air LinesbestOn-time81%Medianon timep9030 minCancel0.7%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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