Leave before 9 am: 95% depart on time. After 4 pm it’s 2 in 3.
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 6 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 4920 | SMF 05:00 | SEA 06:55 | 1h 55m | 57 | 95% | 0.0% | 22 min |
| WN 1739 | SMF 11:00 | SEA 12:55 | 1h 55m | 26 | 58% | 0.0% | 38 min |
| WN 2720 | SMF 14:10 | SEA 16:05 | 1h 55m | 16 | 56% | 0.0% | 46 min |
| WN 555 | SMF 19:00 | SEA 21:00 | 2h 00m | 34 | 41% | 0.0% | 40 min |
| WN 2250 | SMF 21:35 | SEA 23:32 | 1h 58m | 16 | 62% | 0.0% | 57 min |
| WN 4985 | SMF 21:55 | SEA 23:50 | 1h 55m | 33 | 94% | 0.0% | 32 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 | SMF | SEA | 2h 00m | 79% | 0.2% | 1,139 | 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