1,309 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

United is clearly ahead here: 2 in 3 of its flights arrive on time, 27 points better than Frontier.

Best time to leave 6–7 am 92% arrive on time from ONT

Best single flight UA 2363 ONT 06:00 → SFO 07:25 · 91% on time Avoid F9 2677 ONT 20:36 → SFO 22:13 · 42% 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

San Francisco flights leaving ONT 8–9 am: 1Close ×


F9 1159	ONT 08:58	SFO 10:30	1h 32m	27	23%	3.7%	57 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.


United (incl. SkyWest)	1,113	67%	0.5%	65 min
Frontier	196	39%	2.6%	69 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.


UA 2363	ONT 06:00	SFO 07:25	91%
F9 2677	ONT 20:36	SFO 22:13	42%

All 5 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.


United	ONT	SFO	1h 27m	67%	0.5%	1,113	Flying now
Frontier	ONT	SFO	1h 37m	39%	2.6%	196	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