Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sun 4:00 PM ET · 11 nonstops

Fri, Oct 9: UA 5408 at 07:45 is the safest bet, 7% chance of being 15+ min late; evening flights run 11–29%.

Safest bet that day UA 5408 SLC 07:45 → LAX 09:15 · 7% chance 15+ min late · usually 90% on time Riskiest DL 1142 SLC 20:35 → LAX 21:29 · 29% chance 15+ min late · usually 76% 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.


UA 5408 United flown by SkyWest Flight history →	SLC 07:45	LAX 09:15	7%	4%	0.5%	90%
UA 5456 United flown by SkyWest Flight history →	SLC 16:42	LAX 17:53	11%	4%	0.5%	97%
DL 829 Delta Flight history →	SLC 11:30	LAX 12:27	12%	5%	0.6%	88%
DL 1095 Delta Flight history →	SLC 09:35	LAX 10:34	13%	4%	0.6%	92%
WN 3746 Southwest Flight history →	SLC 11:20	LAX 12:15	16%	4%	0.5%	94%
DL 1087 Delta Flight history →	SLC 07:53	LAX 08:50	16%	5%	0.6%	92%
F9 4129 Frontier Flight history →	SLC 10:20	LAX 11:22	16%	5%	0.9%	90%
DL 841 Delta Flight history →	SLC 15:40	LAX 16:36	18%	5%	0.6%	81%
DL 1161 Delta Flight history →	SLC 17:10	LAX 18:07	23%	6%	0.6%	85%
DL 1197 Delta Flight history →	SLC 22:45	LAX 23:42	24%	5%	0.6%	84%
DL 1142 Delta Flight history →	SLC 20:35	LAX 21:29	29%	6%	0.6%	76%

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