Showing Delta only (incl. its regional partners)All airlines ×

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

Leave before 9 am: 9 in 10 depart on time. After 4 pm it’s 72%.

Best time to leave 8–9 am 89% arrive on time from ATL

Best single flight DL 665 ATL 09:15 → ONT 10:40 · 85% on time Avoid DL 779 ATL 20:25 → ONT 21:50 · 71% 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).

ATL

% 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.

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 665	ATL 09:15	ONT 10:40	85%
DL 779	ATL 20:25	ONT 21:50	71%

All 4 Delta 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.


DL 665	ATL 09:15	ONT 10:40	4h 25m	365	85%	2.5%	53 min
DL 745	ATL 16:59	ONT 18:36	4h 37m	31	65%	0.0%	36 min
DL 2891	ATL 16:59	ONT 18:30	4h 31m	78	50%	0.0%	59 min
DL 779	ATL 20:25	ONT 21:50	4h 25m	250	71%	1.6%	53 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.


Delta	ATL	ONT	4h 31m	76%	1.7%	937	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