Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Mon 12:00 PM ET · 4 nonstops

Fri, Oct 9 looks like a normal day here: all 4 nonstops are 5–13% likely to arrive 15+ min late.

Safest bet that day DL 3944 SLC 09:35 → IDA 10:43 · 5% chance 15+ min late · usually 94% on time Riskiest DL 2608 SLC 21:30 → IDA 22:32 · 13% chance 15+ min late · usually 79% 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 3944 Delta flown by SkyWest Flight history →	SLC 09:35	IDA 10:43	5%	3%	0.5%	94%
DL 3765 Delta flown by SkyWest Flight history →	SLC 13:30	IDA 14:36	7%	2%	0.5%	93%
DL 3895 Delta flown by SkyWest Flight history →	SLC 17:10	IDA 18:18	8%	3%	0.5%	89%
DL 2608 Delta Flight history →	SLC 21:30	IDA 22:32	13%	4%	0.7%	79%

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