Historical on-time performance
San Francisco to St. Louis
1,736 miData through Dec 2025Source: US DOT · BTS
Flights on SFO–STL arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 553 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time65%Median5 minp9050 minCancel0.0%Flights245
- United AirlinesbestOn-time77%Medianon timep9030 minCancel1.0%Flights308
Why flights run late
Delay causes
- Airline27%
- Weather0%
- Air traffic (NAS)12%
- Late aircraft61%
- 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 SFO → STL
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 68% to 88% on time.
- Mornings88% on time · p90 15 min · 201 flights
- Evenings81% on time · p90 55 min · 84 flights · limited
- Middays68% on time · p90 50 min · 914 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 64% to 80% on time.
- Saturdays80% on time · p90 30 min · 159 flights · limited
- Tuesdays78% on time · p90 35 min · 164 flights · limited
- Sundays73% on time · p90 50 min · 192 flights · limited
- Wednesdays71% on time · p90 45 min · 184 flights · limited
- Thursdays69% on time · p90 60 min · 192 flights · limited
- Mondays65% on time · p90 55 min · 194 flights · limited
- Fridays64% on time · p90 55 min · 191 flights · limited
Advertisement
Keep exploring