1,239 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 92% on time.

Best time to leave 9–10 am 97% arrive on time from ONT

Best single flight DL 2708 ONT 06:00 → SLC 08:50 · 95% 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

Salt Lake City flights leaving ONT 5–6 pm: 2Close ×


DL 4443flown by SkyWest	ONT 17:21	SLC 20:17	1h 56m	55	87%	0.0%	123 min
DL 3762flown by SkyWest	ONT 17:55	SLC 20:47	1h 52m	31	97%	0.0%	23 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.


Delta (incl. SkyWest)	1,209	92%	0.9%	90 min
Frontier	30	–	0.0%	50 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.


DL 2708	ONT 06:00	SLC 08:50	95%

All 6 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.


Delta	ONT	SLC	1h 50m	92%	0.9%	1,209	Flying now
Frontier	ONT	SLC	1h 48m	90%few flights	0.0%	30	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