Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sun 4:00 PM ET · 4 nonstops

Fri, Oct 9 looks like a normal day here: all 4 nonstops are 6–14% likely to arrive 15+ min late.

Safest bet that day DL 1302 SLC 08:00 → ONT 08:47 · 6% chance 15+ min late · usually 97% on time Riskiest DL 1614 SLC 22:59 → ONT 23:48 · 14% chance 15+ min late · usually 89% on time

Every nonstop on Fri, Oct 9

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 1302 Delta Flight history →	SLC 08:00	ONT 08:47	6%	2%	0.7%	97%
DL 4443 Delta flown by SkyWest Flight history →	SLC 15:35	ONT 16:30	9%	5%	0.6%	87%
DL 3172 Delta Flight history →	SLC 11:21	ONT 12:10	10%	4%	0.7%	91%
DL 1614 Delta Flight history →	SLC 22:59	ONT 23:48	14%	4%	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 Fri, Oct 9 (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