Historical on-time performance
Atlanta to Seattle
2,182 miData through May 2026Source: US DOT · BTS
Flights on ATL–SEA 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)
Cancelled0.7%of scheduled flights
based on 3,281 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time78%Medianon timep9030 minCancel0.6%Flights2,375
- Alaska AirlinesOn-time71%Medianon timep9045 minCancel1.0%Flights906
Why flights run late
Delay causes
- Airline48%
- Weather5%
- Air traffic (NAS)25%
- Late aircraft21%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline67%
- Weather33%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 24 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 68% to 85% on time.
- Middays85% on time · p90 20 min · 1,843 flights
- Mornings84% on time · p90 20 min · 3,729 flights
- Afternoons79% on time · p90 30 min · 1,594 flights
- Overnights78% on time · p90 45 min · 960 flights
- Evenings68% on time · p90 50 min · 2,140 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 82% on time.
- Wednesdays82% on time · p90 25 min · 1,379 flights
- Saturdays81% on time · p90 30 min · 1,404 flights
- Tuesdays81% on time · p90 30 min · 1,382 flights
- Mondays80% on time · p90 30 min · 1,526 flights
- Thursdays80% on time · p90 30 min · 1,519 flights
- Fridays77% on time · p90 35 min · 1,534 flights
- Sundays76% on time · p90 35 min · 1,522 flights
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