Today: only flights still to leave (it’s 8:15 pm at Seattle); 15 already left

Sunday, October 4 · our forecast odds · issued Sun 9:00 PM ET · connections flying that day

Today looks rough: weather pushes the average chance of arriving 15+ min late to 48%, against 38% on a calm day. Safest: AS 669 at 20:45, 46%.

Nonstops today


AS 669 Alaska Flight history →	SEA 20:45	SLC 23:48	46%	9%	0.4%	85%worse than usual
AS 1459 Alaska Flight history →	SEA 20:33	SLC 23:36	50%	10%	0.4%	44%

Best connections today, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Salt Lake City on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival (Salt Lake City is 1 h ahead of Seattle). Layovers up to 4 hours. Pick a connection for its 12-month details.

No one-ticket connection fits with layovers up to 4 hours that day. Try any airlines.

How these are worked out. Each flight’s odds are our forecast for that day; 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 Sun, Oct 4 (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