Historical on-time performance
St. Louis to San Diego
1,558 miData through Dec 2025Source: US DOT · BTS
Flights on STL–SAN arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay50 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-time72%Medianon timep9050 minCancel0.4%Flights515
Why flights run late
Delay causes
- Airline25%
- Weather7%
- Air traffic (NAS)14%
- Late aircraft54%
- 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 STL → SAN
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 — 90% on time.
- Mornings90% on time · p90 15 min · 391 flights
- Middays77% on time · p90 30 min · 413 flights
- Afternoons71% on time · p90 40 min · 412 flights
- Overnights54% on time · p90 70 min · 65 flights · limited
- Evenings54% on time · p90 90 min · 262 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 80% on time.
- Tuesdays80% on time · p90 30 min · 204 flights
- Thursdays75% on time · p90 35 min · 222 flights
- Saturdays75% on time · p90 40 min · 221 flights
- Wednesdays74% on time · p90 40 min · 200 flights
- Sundays73% on time · p90 45 min · 247 flights
- Mondays70% on time · p90 60 min · 222 flights
- Fridays70% on time · p90 50 min · 227 flights
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