United Airlines STL to SFO on-time performance
United Airlines nonstop flights from St. Louis to San Francisco · Aug 2025 – Jul 2026
On-time arrivals
59%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
30 min
72 min when late
Rank on route
#2 of 3
route average 60% on time
Key facts
- United Airlines flights on STL to SFO arrived on time 59% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 19% arrived an hour or more late.
- That ranks #2 of 3 airlines on this route, which averaged 60% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (57%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion57%
- Late-arriving aircraft28%
- Airline (crew, maintenance, cleaning, fueling)11%
- Extreme weather4%
- Security0%
Other airlines on STL to SFO
- Southwest Airlines59% on time · 26 min avg delay
- SkyWest Airlines63% on time · 37 min avg delay
Full STL to SFO comparison →
United Airlines on-time record across all routes →
186 United Airlines flights tracked on this route; 0 cancelled, 0 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.