Showing Southwest only (incl. its regional partners)All airlines ×
120 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines
No clear winner: Southwest’s BWI → SEA flights land within a few points of 73% on time whatever the hour.
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 2 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.
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 | BWI | SEA | 5h 45m | 73% | 0.8% | 120 | Flying now |
Alternatives with one stop
All connections →| SouthwestDetails → | BWI 09:35 → STL 10:50WN 1110 | 1h 10m St Louis | STL 12:00 → SEA 14:15WN 3981 | 7h 40m | 88% | 43% |
| SouthwestDetails → | BWI 19:00 → MDW 20:05WN 1005 | 1h 55m Chicago | MDW 22:00 → SEA 00:30 +1WN 4144 | 8h 30m | 82% | 40% |
| SouthwestDetails → | BWI 09:40 → DEN 11:25WN 275 | 1h 05m Denver | DEN 12:30 → SEA 14:25WN 4130 | 7h 45m | 86% | 32% |
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