Wednesday, October 7 · typical odds for a Wednesday (too early for a weather forecast) · issued Sat 12:00 PM ET · 4 nonstops

Wed, Oct 7 looks like a normal day here: all 4 nonstops are 4–9% likely to arrive 15+ min late.

Safest bet that day DL 1173 SLC 11:16 → ONT 12:16 · 4% chance 15+ min late Riskiest DL 1614 SLC 22:59 → ONT 23:48 · 9% chance 15+ min late · usually 89% on time

Every nonstop on Wed, Oct 7

12-month record →

Ranked by the chance of arriving 15+ minutes late (typical odds: the weather this date has had in past years), with each flight’s on-time record over Aug 2025 – Jul 2026 beside it. Times are local. Pick a flight for its forecast. Click a column to sort.


DL 1173 Delta	SLC 11:16	ONT 12:16	4%	2%	0.7%	no record
OO 3744 SkyWest	SLC 15:31	ONT 16:35	6%	4%	0.5%	no record
OO 3872 SkyWest	SLC 08:10	ONT 09:02	7%	3%	0.6%	no record
DL 1614 Delta Flight history →	SLC 22:59	ONT 23:48	9%	3%	0.7%	89%

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 Wed, Oct 7 (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