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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
11
12
13
14
15
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19
ONT
95
94
86
92
85
83
76
88
77
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

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 (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 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 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
DL 4070flown by SkyWest ONT 11:59 SEA 14:53 3h 01m 151 91% 0.0% 158 min
AS 654 ONT 12:04 SEA 14:44 2h 40m 279 90% 3.9% 44 min
DL 3840flown by SkyWest ONT 13:35 SEA 16:33 2h 58m 31 90% 0.0% 27 min
AS 567 ONT 14:05 SEA 16:45 2h 40m 45 77% 2.2% 32 min
AS 625 ONT 16:03 SEA 18:52 2h 49m 28 71% 0.0% 42 min
F9 2275 ONT 16:04 SEA 18:58 2h 54m 105 80% 1.0% 114 min
AS 575 ONT 17:26 SEA 20:06 2h 40m 45 61% 2.2% 38 min
DL 4031flown by SkyWest ONT 17:59 SEA 20:50 2h 51m 322 90% 0.3% 70 min
AS 592 ONT 19:41 SEA 22:30 2h 49m 24 71% 0.0% 66 min
AS 594 ONT 21:20 SEA 23:59 2h 39m 115 67% 0.0% 60 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.
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