Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

SOUTHWEST · FLIGHT WN 4517 IN THE AIR (OFF 3:30 PM PT, ETA 5:08 PM PT) · SCHEDULED TIME UNKNOWN

Tuesday, September 29 Today

WN 4517 · SEA → SJC

took off 3:30 PM PT · expected to land 5:08 PM PT (scheduled time unknown)

Forecast issued Tue 5:00 PM ET · 1h before departure

Arrive at SJC more than 15 minutes late?

33% chance · ±1 pts −3 pts · 24h

HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.

What’s moving the odds

↑ Other factors

↑ 3pm departures from SEA are often late

↑ This flight has been late 24% of the time recently

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at SJC

Weather at each end

SEA (origin) Gusts24 kt Ceiling900 ft Visibility6 mi Precip0.03 in

SJC (destination) Gusts7 kt Ceilingnone (clear) Visibility8 mi Precipnone

How this resolves

Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.

Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.

WN 4517 · SEA → SJC

Odds over time