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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
16
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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
Seattle flights leaving ONT 4–5 pm: 2Close ×
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

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