Showing Southwest only (incl. its regional partners)All airlines ×
103 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines
The nonstop is quickest: Southwest STL → SEA (4h 20m), on time barely half the time. Southwest via Love Field (7h 25m) is more reliable, 78%, but takes 3h 05m longer.
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 1 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 3981 | STL 12:00 | SEA 14:15 | 4h 15m | 57 | 49% | 0.0% | 41 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 | SEA | 4h 20m | 55% | 0.0% | 103 | Flying now |
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