Thursday, October 8 · typical odds for a Thursday (too early for a weather forecast) · issued Sun 12:00 PM ET · connections flying that day

Thu, Oct 8 looks like a normal day here: all 2 nonstops are 6–8% likely to arrive 15+ min late.

Nonstops that day

All 2 nonstops →


DL 409 Delta	ONT 07:02	ATL 14:19	6%	2%	0.6%	no record
DL 665 Delta Flight history →	ONT 11:48	ATL 19:15	8%	3%	0.6%	85%

Best connections that day, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Atlanta on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival (Atlanta is 3 h ahead of Ontario). Layovers up to 4 hours. Pick a connection for its 12-month details.


Delta Details →	ONT 06:00 → SLC 08:48DL 2708	2h 17m Salt Lake City	SLC 11:05 → ATL 16:49DL 885	7h 49m	98%	88%
United Details →	ONT 05:00 → DEN 08:20UA 2446	1h 55m Denver	DEN 10:15 → ATL 15:30UA 2806	7h 30m	98%	85%
United Details →	ONT 06:00 → SFO 07:25UA 2363	3h 26m San Francisco	SFO 10:51 → ATL 18:54UA 702	9h 54m	99%	80%
American Details →	ONT 05:34 → DFW 10:41AA 1412	1h 28m Dallas-Fort Worth	DFW 12:09 → ATL 15:39AA 1008	7h 05m	96%	80%
American Details →	ONT 06:11 → PHX 07:30AA 1194	1h 26m Phoenix	PHX 08:56 → ATL 15:44AA 883	6h 33m	94%	77%
Delta Details →	ONT 06:20 → SEA 09:15DL 3816 · flown by SkyWest	2h 44m Seattle	SEA 11:59 → ATL 20:04DL 554	10h 44m	98%	77%
American Details →	ONT 07:00 → DFW 12:09AA 2893	1h 09m Dallas-Fort Worth	DFW 13:18 → ATL 16:48AA 2398	6h 48m	95%	75%
United Details →	ONT 13:18 → DEN 16:38UA 1263	1h 17m Denver	DEN 17:55 → ATL 23:11UA 248	6h 53m	90%	75%

How these are worked out. Each flight’s odds are our forecast for that day (typical odds until the weather forecast covers it); flights of airlines we don’t forecast yet use their 12-month record and are marked. Makes the connection: the first flight’s 12-month lateness curve, scaled so its chance of arriving 15+ min late matches the day’s forecast, at the layover minus the 45-minute minimum (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled × second flight within 15 minutes, each from the day’s forecast.

About this data: forecast odds from our model for Thu, Oct 8 (newest published update); 12-month records from US DOT on-time data, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. JSON