Route Reliability
San Francisco → St. Louis
SFO–STL · 1,735 miles · San Francisco International Airport to St. Louis Lambert International Airport
- 70%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 0.9%
- Cancelled
- 803
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines80%461 flights
- 2.Southwest Airlines56%342 flights
What the data says
Morning flights do better here.
SFO–STL flights departing between 6–9 AM arrived on time 94% of the time, versus 50% between 12–3 PM.
Mondays have been rough.
SFO–STL flights arrived on time 82% of the time on Saturdays and just 59% on Mondays. That gap is worth planning around.
United Airlines has a clear lead on this route.
United Airlines arrived on time 80% of the time on this route; Southwest Airlines managed 56%.
Recent months have been rougher.
SFO–STL flights arrived on time 62% of the time over the last three months in the data, compared with 75% in the three months before that.
Flights on this route
The breakdown
- Mon59%(120 flights)
- Tue77%(104 flights)
- Wed68%(117 flights)
- Thu67%(121 flights)
- Fri70%(117 flights)
- Sat82%(87 flights)
- Sun69%(127 flights)
- 3–6 AM—(1 flights)
- 6–9 AM94%(31 flights)
- 9 AM–12 PM74%(474 flights)
- 12–3 PM50%(156 flights)
- 3–6 PM76%(38 flights)
- 9 PM–12 AM71%(93 flights)
Jun 81% → May 47% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 81% | 82 |
| July 2025 | 65% | 82 |
| August 2025 | 79% | 62 |
| September 2025 | 73% | 60 |
| October 2025 | 72% | 61 |
| November 2025 | 57% | 56 |
| December 2025 | 64% | 61 |
| January 2026 | 91% | 66 |
| February 2026 | 70% | 59 |
| March 2026 | 85% | 58 |
| April 2026 | 56% | 75 |
| May 2026 | 47% | 71 |
Same trip, other airports
Keep nerding
Based on 803 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.