Historical on-time performance
St. Louis to San Francisco
Flights on STL–SFO arrive on time 63% of the time over the last 12 months.
based on 507 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- United AirlinesOn-time67%Medianon timep9080 minCancel0.6%Flights166
- Southwest AirlinesOn-time61%Median5 minp9045 minCancel0.7%Flights153
- SkyWest AirlinesOn-time60%Medianon timep9095 minCancel2.7%Flights188
Why flights run late
Delay causes
- Airline34%
- Weather2%
- Air traffic (NAS)38%
- Late aircraft26%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline29%
- Weather71%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 7 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 → SFO
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 67% to 72% on time.
- Mornings72% on time · p90 60 min · 583 flights
- Middays69% on time · p90 45 min · 346 flights
- Evenings67% on time · p90 80 min · 475 flights
- Afternoons67% on time · p90 50 min · 204 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 62% to 76% on time.
- Tuesdays76% on time · p90 45 min · 211 flights
- Saturdays72% on time · p90 50 min · 189 flights · limited
- Wednesdays72% on time · p90 50 min · 232 flights
- Fridays69% on time · p90 50 min · 248 flights
- Mondays69% on time · p90 65 min · 248 flights
- Thursdays68% on time · p90 80 min · 243 flights
- Sundays62% on time · p90 80 min · 249 flights
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