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1,080 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 9 in 10 on time.

Best time to leave 1–2 pm 94% arrive on time from ONT
Best single flight AS 2456 ONT 17:32 → PDX 19:49 · 93% 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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ONT
92
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84
% 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
Portland flights leaving ONT 7–8 am: 3Close ×
AS 2397flown by Horizon ONT 07:00 PDX 09:21 2h 21m 19 74% 0.0% 308 min
AS 2304flown by Horizon ONT 07:00 PDX 09:24 2h 24m 28 81% 3.6% 27 min
AS 345 ONT 07:00 PDX 09:15 2h 15m 31 100% 0.0% –

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
Alaska (incl. SkyWest, Horizon) 1,020 92% 1.4% 83 min
Frontier 60 – 0.0% 34 min

Dimmed: fewer than 150 flights in the year, too few to rank.

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 2456flown by Horizon ONT 17:32 PDX 19:49 93%
All 7 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.
Alaska ONT PDX 2h 24m 92% 1.4% 1,020 Flying now
Frontier ONT PDX 2h 26m 75% 0.0% 60 Not 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