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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).

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SEA
95
94
88
87
95
76
81
80
75
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
Salt Lake City flights leaving SEA 11 am–12 pm: 3Close ×
DL 1265 SEA 11:05 SLC 14:11 2h 06m 344 86% 0.6% 56 min
AS 1477 SEA 11:32 SLC 14:48 2h 16m 28 89% 0.0% 27 min
AS 733 SEA 11:51 SLC 15:04 2h 13m 271 69% 0.7% 43 min

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