2,476 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 94% depart on time. After 4 pm it’s 64%.

Best time to leave 5–6 am 98% arrive on time from ONT

Best single flight F9 2232 ONT 11:58 → LAS 13:06 · 84% on time Avoid F9 4758 ONT 15:34 → LAS 16:46 · 70% 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).

ONT

% 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

Las Vegas flights leaving ONT 8–9 am: 2Close ×


WN 3580	ONT 08:30	LAS 09:35	1h 05m	16	94%	0.0%	19 min
WN 2333	ONT 08:35	LAS 09:40	1h 05m	41	85%	2.4%	33 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.


Frontier	728	78%	1.5%	91 min
Southwest	1,748	78%	0.7%	51 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.


F9 2232	ONT 11:58	LAS 13:06	84%
F9 4758	ONT 15:34	LAS 16:46	70%

All 10 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.


Frontier	ONT	LAS	1h 12m	78%	1.5%	728	Flying now
Southwest	ONT	LAS	1h 05m	78%	0.7%	1,748	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