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4,145 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 93% depart on time. After 4 pm it’s 78%.

Best time to leave 7–8 am 95% arrive on time from SEA
Best single flight AS 430 SEA 07:05 → SLC 10:15 · 95% on time Avoid AS 733 SEA 11:51 → SLC 15:04 · 69% on time

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).

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SEA
95
94
88
87
95
76
81
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78
79
80
81
78
72
% 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.

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
Delta 2,227 87% 0.5% 59 min
Alaska (incl. SkyWest, Horizon) 1,828 81% 1.1% 44 min
Frontier 90 – 3.3% 55 min

Dimmed: fewer than 150 flights in the year, too few to rank.

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.
AS 430 SEA 07:05 SLC 10:15 95%
DL 1128 SEA 05:30 SLC 08:30 94%
DL 1016 SEA 09:30 SLC 12:38 90%
DL 1265 SEA 11:05 SLC 14:11 86%
DL 1120 SEA 13:30 SLC 16:40 83%
· · ·
DL 1165 SEA 17:59 SLC 21:09 81%
AS 3298flown by SkyWest SEA 19:07 SLC 22:14 79%
AS 733 SEA 11:51 SLC 15:04 69%
All 18 flights on this route →

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.
Delta SEA SLC 2h 08m 87% 0.5% 2,227 Flying now
Alaska SEA SLC 2h 07m 81% 1.1% 1,828 Flying now
Frontier SEA SLC 2h 09m 74% 3.3% 90 Not 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