Leave before 9 am: 94% depart on time. After 4 pm it’s 27%.
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.
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 9 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 3615 | SEA 05:15 | DEN 08:50 | 2h 35m | 57 | 95% | 0.0% | 208 min |
| WN 4920 | SEA 07:35 | DEN 11:15 | 2h 40m | 16 | 94% | 0.0% | 20 min |
| WN 3397 | SEA 07:50 | DEN 11:25 | 2h 35m | 41 | 93% | 0.0% | 38 min |
| WN 3616 | SEA 12:20 | DEN 16:10 | 2h 50m | 26 | 44% | 0.0% | 84 min |
| WN 1049 | SEA 14:15 | DEN 18:10 | 2h 55m | 16 | 31% | 0.0% | 63 min |
| WN 3617 | SEA 14:35 | DEN 18:20 | 2h 45m | 42 | 14% | 0.0% | 47 min |
| WN 2720 | SEA 16:45 | DEN 20:30 | 2h 45m | 16 | 25% | 0.0% | 71 min |
| WN 4845 | SEA 19:30 | DEN 23:10 | 2h 35m | 42 | 40% | 0.0% | 59 min |
| WN 2328 | SEA 19:30 | DEN 23:08 | 2h 38m | 16 | 31% | 0.0% | 67 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 | SEA | DEN | 2h 40m | 70% | 0.6% | 1,345 | 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