Historical on-time performance
San Diego to St. Louis
1,557 miData through May 2026Source: US DOT · BTS
Flights on SAN–STL arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay35 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-time78%Medianon timep9035 minCancel0.2%Flights475
Why flights run late
Delay causes
- Airline27%
- Weather0%
- Air traffic (NAS)15%
- Late aircraft58%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 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 SAN → 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 — 87% on time.
- Mornings87% on time · p90 15 min · 751 flights
- Middays79% on time · p90 35 min · 441 flights
- Evenings66% on time · p90 65 min · 367 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 85% on time.
- Saturdays85% on time · p90 20 min · 236 flights
- Tuesdays84% on time · p90 35 min · 203 flights
- Wednesdays83% on time · p90 20 min · 199 flights · limited
- Sundays80% on time · p90 35 min · 259 flights
- Mondays79% on time · p90 40 min · 226 flights
- Thursdays76% on time · p90 50 min · 230 flights
- Fridays70% on time · p90 50 min · 237 flights
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