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Showing Southwest only (incl. its regional partners)All airlines ×
673 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 82% depart on time. After 4 pm it’s barely half.

Best time to leave 6–7 am 93% arrive on time from STL

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).

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STL
89
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75
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56
36
% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

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 Southwest flight on this route ran 150+ times in the year.

All 4 Southwest flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
WN 3937 STL 08:10 LAX 10:05 3h 55m 34 85% 0.0% 27 min
WN 2047 STL 08:25 LAX 10:20 3h 55m 16 94% 0.0% 139 min
WN 4556 STL 21:20 LAX 23:10 3h 50m 25 44% 0.0% 49 min
WN 2269 STL 21:55 LAX 23:50 3h 55m 24 33% 0.0% 68 min

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 LAX 4h 05m 74% 0.0% 673 Flying now

Alternatives with one stop

All connections →
SouthwestDetails → STL 05:45 → PHX 06:55WN 3967 1h 00m Phoenix PHX 07:55 → LAX 09:20WN 2427 5h 35m 98% 83%
SouthwestDetails → STL 05:45 → DEN 07:00WN 3909 50m Denver DEN 07:50 → LAX 09:20WN 1568 5h 35m 84% 70%
SouthwestDetails → STL 13:20 → PHX 14:30WN 3968 1h 20m Phoenix PHX 15:50 → LAX 17:10WN 2388 5h 50m 76% 25%
Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

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