Historical on-time performance
Seattle to Atlanta
2,182 miData through May 2026Source: US DOT · BTS
Flights on SEA–ATL arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 3,280 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time82%Medianon timep9030 minCancel0.7%Flights2,375
- Alaska AirlinesOn-time77%Medianon timep9035 minCancel0.7%Flights905
Why flights run late
Delay causes
- Airline52%
- Weather5%
- Air traffic (NAS)16%
- Late aircraft26%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline64%
- Weather36%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 22 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 SEA → ATL
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 85% on time.
- Mornings85% on time · p90 20 min · 3,252 flights
- Overnights79% on time · p90 30 min · 2,537 flights
- Middays78% on time · p90 30 min · 2,335 flights
- Afternoons78% on time · p90 35 min · 1,947 flights
- Evenings78% on time · p90 35 min · 194 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 84% on time.
- Tuesdays84% on time · p90 20 min · 1,374 flights
- Wednesdays83% on time · p90 25 min · 1,397 flights
- Thursdays81% on time · p90 25 min · 1,521 flights
- Mondays81% on time · p90 30 min · 1,513 flights
- Saturdays80% on time · p90 30 min · 1,392 flights
- Fridays78% on time · p90 35 min · 1,533 flights
- Sundays77% on time · p90 35 min · 1,535 flights
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