Historical on-time performance
San Diego to St. Louis
1,558 miData through Dec 2025Source: US DOT · BTS
Flights on SAN–STL 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)
Cancelled0.4%of scheduled flights
based on 515 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time81%Medianon timep9030 minCancel0.4%Flights515
Why flights run late
Delay causes
- Airline20%
- Weather0%
- Air traffic (NAS)18%
- Late aircraft63%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
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
- Middays77% on time · p90 30 min · 411 flights
- Evenings65% on time · p90 65 min · 358 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 86% on time.
- Saturdays86% on time · p90 20 min · 221 flights
- Wednesdays81% on time · p90 25 min · 200 flights
- Tuesdays81% on time · p90 30 min · 204 flights
- Mondays80% on time · p90 40 min · 226 flights
- Sundays79% on time · p90 35 min · 256 flights
- Thursdays75% on time · p90 45 min · 227 flights
- Fridays69% on time · p90 50 min · 232 flights
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