Thursday, October 8 · typical odds for a Thursday (too early for a weather forecast) · issued Sun 12:00 PM ET · 6 nonstops

Thu, Oct 8 looks like a normal day here: all 6 nonstops are 4–11% likely to arrive 15+ min late.

Safest bet that day DL 1203 SLC 07:45 → PDX 08:37 · 4% chance 15+ min late · usually 89% on time Riskiest DL 1244 SLC 15:17 → PDX 16:09 · 11% chance 15+ min late · usually 88% on time

Every nonstop on Thu, Oct 8

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 1203 Delta Flight history →	SLC 07:45	PDX 08:37	4%	2%	0.6%	89%
OO 3132 SkyWest	SLC 08:43	PDX 09:49	6%	3%	0.5%	no record
AS 3430 Alaska flown by SkyWest Flight history →	SLC 12:44	PDX 13:50	6%	3%	0.6%	90%
DL 1209 Delta Flight history →	SLC 11:15	PDX 12:10	6%	3%	0.6%	89%
DL 1238 Delta Flight history →	SLC 17:25	PDX 18:18	10%	4%	0.6%	87%
DL 1244 Delta Flight history →	SLC 15:17	PDX 16:09	11%	3%	0.6%	88%

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