Tuesday, October 6 · our forecast odds · issued Mon 4:00 PM ET · connections flying that day

Tomorrow looks like a normal day here: all 2 nonstops are 6–7% likely to arrive 15+ min late.

Nonstops that day


DL 409 Delta	ONT 07:03	ATL 14:16	6%	2%	0.7%	no record
DL 665 Delta Flight history →	ONT 11:48	ATL 19:15	7%	2%	0.7%	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.


United Details →	ONT 05:00 → DEN 08:20UA 2446	2h 03m Denver	DEN 10:23 → ATL 15:36UA 2806	7h 36m	99%	89%
Delta Details →	ONT 06:00 → SLC 08:48DL 2708	1h 07m Salt Lake City	SLC 09:55 → ATL 15:39DL 835	6h 39m	98%	88%
United Details →	ONT 06:54 → ORD 12:56UA 2226	59m Chicago	ORD 13:55 → ATL 17:10UA 356	7h 16m	94%	83%
American Details →	ONT 05:34 → DFW 10:41AA 1412	1h 26m Dallas-Fort Worth	DFW 12:07 → ATL 15:31AA 1008	6h 57m	96%	81%
Delta Details →	ONT 18:01 → SEA 20:50DL 4031 · flown by SkyWest	2h 29m Seattle	SEA 23:19 → ATL 06:57 +1DL 567	9h 56m	98%	78%
United Details →	ONT 13:18 → DEN 16:38UA 1263	1h 10m Denver	DEN 17:48 → ATL 22:57UA 1305	6h 39m	92%	78%
American Details →	ONT 08:15 → DFW 13:25AA 2893	2h 34m Dallas-Fort Worth	DFW 15:59 → ATL 19:23AA 2403	8h 08m	97%	75%
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%	72%

How these are worked out. Each flight’s odds are our forecast for that day; 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 Tue, Oct 6 (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