Historical on-time performance
Seattle to St. Louis
Flights on SEA–STL arrive on time 77% of the time over the last 12 months.
based on 811 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- Alaska AirlinesOn-time78%Medianon timep9030 minCancel0.3%Flights780
- Southwest AirlinesOn-time58%Median5 minp9045 minCancel0.0%Flights31
Why flights run late
Delay causes
- Airline40%
- Weather0%
- Air traffic (NAS)20%
- Late aircraft40%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather100%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 2 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 → STL
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 — 84% on time.
- Mornings84% on time · p90 20 min · 1,096 flights
- Evenings76% on time · p90 35 min · 878 flights
- Middays63% on time · p90 45 min · 578 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 78% on time.
- Sundays78% on time · p90 30 min · 394 flights
- Mondays77% on time · p90 30 min · 387 flights
- Tuesdays77% on time · p90 30 min · 328 flights
- Saturdays77% on time · p90 30 min · 336 flights
- Wednesdays77% on time · p90 35 min · 328 flights
- Thursdays75% on time · p90 30 min · 391 flights
- Fridays75% on time · p90 40 min · 399 flights
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