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2,505 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 4 in 5.

Best time to leave 7–8 am 94% arrive on time from ONT
Best single flight AS 607 ONT 06:02 → SEA 08:44 · 93% on time Avoid AS 654 ONT 12:04 → SEA 14:44 · 90% 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).

6
7
8
9
10
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12
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14
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ONT
95
94
86
92
85
83
76
88
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84
78
78
% 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
Seattle flights leaving ONT 6–7 am: 2Close ×
AS 607 ONT 06:02 SEA 08:44 2h 42m 263 93% 0.8% 71 min
DL 3816flown by SkyWest ONT 06:20 SEA 09:17 2h 57m 86 94% 0.0% 81 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 (incl. SkyWest) 1,076 92% 0.3% 92 min
Alaska (incl. SkyWest) 1,260 83% 1.8% 53 min
Frontier 169 82% 0.6% 92 min

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 607 ONT 06:02 SEA 08:44 93%
DL 4070flown by SkyWest ONT 11:59 SEA 14:53 91%
DL 4031flown by SkyWest ONT 17:59 SEA 20:50 90%
AS 654 ONT 12:04 SEA 14:44 90%
All 12 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 ONT SEA 2h 58m 92% 0.3% 1,076 Flying now
Alaska ONT SEA 2h 43m 83% 1.8% 1,260 Flying now
Frontier ONT SEA 2h 54m 82% 0.6% 169 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