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Showing Alaska only (incl. its regional partners)All airlines ×
1,259 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 9 in 10 depart on time. After 4 pm it’s 3 in 4.

Best time to leave 6–7 pm 95% arrive on time from SEA
Best single flight AS 1364 SEA 08:33 → ONT 11:14 · 90% on time Avoid AS 489 SEA 20:33 → ONT 23:11 · 71% 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
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% 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.
AS 1364 SEA 08:33 ONT 11:14 90%
AS 592 SEA 17:51 ONT 20:32 75%
AS 489 SEA 20:33 ONT 23:11 71%

All 6 Alaska 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.
AS 1364 SEA 08:33 ONT 11:14 2h 41m 263 90% 4.2% 46 min
AS 565 SEA 10:25 ONT 13:09 2h 44m 46 76% 2.2% 38 min
AS 625 SEA 12:30 ONT 15:09 2h 39m 28 82% 0.0% 53 min
AS 571 SEA 13:50 ONT 16:30 2h 40m 45 52% 2.2% 36 min
AS 592 SEA 17:51 ONT 20:32 2h 41m 218 75% 0.0% 51 min
AS 489 SEA 20:33 ONT 23:11 2h 38m 197 71% 0.5% 43 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.
Alaska SEA ONT 2h 41m 78% 1.5% 1,259 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