Historical on-time performance
St. Louis to San Diego
1,557 miData through May 2026Source: US DOT · BTS
Flights on STL–SAN arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 475 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time75%Medianon timep9040 minCancel0.2%Flights475
Why flights run late
Delay causes
- Airline25%
- Weather7%
- Air traffic (NAS)18%
- Late aircraft50%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline100%
- Weather0%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 1 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 STL → SAN
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 — 90% on time.
- Mornings90% on time · p90 10 min · 486 flights
- Middays76% on time · p90 35 min · 371 flights
- Afternoons72% on time · p90 40 min · 378 flights
- Evenings55% on time · p90 90 min · 267 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 83% on time.
- Tuesdays83% on time · p90 25 min · 203 flights
- Saturdays76% on time · p90 40 min · 236 flights
- Sundays75% on time · p90 45 min · 250 flights
- Thursdays75% on time · p90 35 min · 225 flights
- Wednesdays74% on time · p90 35 min · 199 flights · limited
- Fridays71% on time · p90 45 min · 232 flights
- Mondays70% on time · p90 60 min · 222 flights
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