Showing Southwest only (incl. its regional partners)All airlines ×

1,140 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 95% depart on time. After 4 pm it’s almost half.

Best time to leave 5–6 am 97% arrive on time from SEA

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).

SEA

% 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 5 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 3629	SEA 05:00	SMF 06:50	1h 50m	57	98%	0.0%	17 min
WN 3630	SEA 07:35	SMF 09:35	2h 00m	34	91%	0.0%	22 min
WN 1876	SEA 13:30	SMF 15:35	2h 05m	16	56%	0.0%	47 min
WN 3566	SEA 18:05	SMF 20:05	2h 00m	33	61%	0.0%	62 min
WN 636	SEA 21:40	SMF 23:35	1h 58m	42	52%	0.0%	74 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	SMF	1h 55m	74%	0.4%	1,140	Flying now

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