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2,504 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: airlines and hours on this route all land within a few points of 83% on time.

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).

7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
SEA
91
91
84
77
88
76
68
89
75
82
91
86
80
73
% 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 89% 0.4% 51 min
Frontier 169 84% 1.8% 70 min
Alaska 1,259 78% 1.5% 47 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 1364 SEA 08:33 ONT 11:14 90%
DL 4070flown by SkyWest SEA 08:25 ONT 11:17 89%
DL 4031flown by SkyWest SEA 14:35 ONT 17:19 88%
AS 592 SEA 17:51 ONT 20:32 75%
AS 489 SEA 20:33 ONT 23:11 71%

All 11 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.
DL 4070flown by SkyWest SEA 08:25 ONT 11:17 2h 52m 151 89% 0.0% 87 min
AS 1364 SEA 08:33 ONT 11:14 2h 41m 263 90% 4.2% 46 min
DL 3840flown by SkyWest SEA 09:45 ONT 12:33 2h 48m 31 100% 0.0% –
AS 565 SEA 10:25 ONT 13:09 2h 44m 46 76% 2.2% 38 min
F9 2276 SEA 11:53 ONT 14:39 2h 46m 75 88% 4.0% 95 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
DL 4031flown by SkyWest SEA 14:35 ONT 17:19 2h 44m 348 88% 0.3% 40 min
AS 592 SEA 17:51 ONT 20:32 2h 41m 218 75% 0.0% 51 min
DL 3884flown by SkyWest SEA 19:50 ONT 22:41 2h 51m 86 84% 0.0% 33 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.
Delta SEA ONT 2h 48m 89% 0.4% 1,076 Flying now
Frontier SEA ONT 2h 46m 84% 1.8% 169 Flying now
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