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1,310 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

United is clearly ahead here: 4 in 5 of its flights arrive on time, 23 points better than Frontier.

Best time to leave 8–9 am 87% arrive on time from SFO
Best single flight UA 552 SFO 21:00 → ONT 22:37 · 83% on time Avoid F9 2678 SFO 09:41 → ONT 11:13 · 58% 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).

8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SFO
89
71
91
68
80
79
39
% 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.
United (incl. SkyWest) 1,114 81% 0.5% 59 min
Frontier 196 58% 3.1% 97 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 552 SFO 21:00 ONT 22:37 83%
UA 2661 SFO 10:40 ONT 12:12 78%
F9 2678 SFO 09:41 ONT 11:13 58%

All 4 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.
F9 2678 SFO 09:41 ONT 11:13 1h 34m 196 58% 3.1% 97 min
UA 2661 SFO 10:40 ONT 12:12 1h 32m 164 78% 0.0% 37 min
UA 5613flown by SkyWest SFO 16:17 ONT 17:54 1h 37m 78 67% 3.8% 71 min
UA 552 SFO 21:00 ONT 22:37 1h 37m 194 83% 0.5% 51 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.
United SFO ONT 1h 27m 81% 0.5% 1,114 Flying now
Frontier SFO ONT 1h 34m 58% 3.1% 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