Leave before 9 am: 82% depart on time. After 4 pm it’s 57%.
Time of day × airport
Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).
Pick an hour to see this route’s flights leaving then.
Airlines on this route
Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
| Southwest | 473 | 79% | 0.2% | 48 min |
Flights, best and worst
Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.
No flight on this route ran 150+ times in the year.
All 1 flights on this route →Nonstops by airline and airport
Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.
| Southwest | STL | SAN | 4h 00m | 79% | 0.2% | 473 | Flying now |
Alternatives with one stop
All connections →| SouthwestDetails → | STL 05:45 → DEN 07:00WN 3909 | 1h 15m Denver | DEN 08:15 → SAN 09:40WN 1699 | 5h 55m | 97% | 83% |
| UnitedDetails → | STL 05:10 → DEN 06:32UA 362 | 1h 11m Denver | DEN 07:43 → SAN 09:05UA 2309 | 5h 55m | 93% | 82% |
| SouthwestDetails → | STL 05:05 → DAL 06:45WN 1396 | 1h 05m Dallas | DAL 07:50 → SAN 08:50WN 192 | 5h 45m | 92% | 79% |
About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON