Route
STL → SFO
St. Louis Lambert International Airport San Francisco International Airport
Alerts at STL and SFO
How punctual is this route?
- On-time arrivals
- 57.5%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 75 min
- Flights arriving 15+ minutes late
- Flights tracked
- 754
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 57%
- Airline (crew, maintenance, cleaning) 22%
- Late-arriving aircraft 18%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 80.0% | 60 |
| October 2025 | 58.1% | 62 |
| November 2025 | 78.9% | 57 |
| December 2025 | 71.7% | 60 |
| January 2026 | 88.1% | 69 |
| February 2026 | 68.3% | 60 |
| March 2026 | 86.4% | 60 |
| April 2026 | 45.3% | 77 |
| May 2026 | 32.4% | 71 |
| June 2026 | 18.3% | 60 |
| July 2026 | 25.8% | 62 |
| August 2026 | 42.9% | 56 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 342 | 55.8% | 0.0% | 65 min |
| SkyWest Airlines | 233 | 63.2% | 2.1% | 99 min |
| United Airlines | 179 | 53.6% | 0.0% | 67 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA2482
71% late · 82 flights
-
OO5907
15% late · 55 flights
-
WN2265
25% late · 55 flights
-
UA2416
21% late · 53 flights
-
WN1596
21% late · 53 flights
-
OO5728
51% late · 52 flights
-
WN1749
67% late · 42 flights
-
OO5943
75% late · 37 flights
-
WN4555
7% late · 28 flights
-
WN3982
78% late · 27 flights
-
OO5530
28% late · 25 flights
-
UA1603
12% late · 24 flights
-
OO5318
18% late · 23 flights
-
WN4015
24% late · 21 flights
-
WN4315
43% late · 21 flights
-
WN4157
65% late · 20 flights
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