Today: only flights still to leave (it’s 8:15 pm at Ontario); 12 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 45%, against 25% on a calm day. Safest: F9 4206 at 20:16, 44%.

Nonstops today


F9 4206 Frontier Flight history →	ONT 20:16	LAS 21:36	44%	27%	1.4%	73%worse than usual
WN 2579 Southwest	ONT 22:15	LAS 23:25	46%	19%	0.4%	no record

Best connections today, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Las Vegas on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival. Layovers up to 4 hours. Pick a connection for its 12-month details.


Tight connection: often missed
Southwest Details →	ONT 20:40 → PHX 21:55WN 3160	55m Phoenix	PHX 22:50 → LAS 00:06 +1WN 3816	3h 26m	31%	14%

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