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 4087 IN THE AIR (OFF 8:32 AM CT, ETA 9:15 AM CT) · SCHEDULED TIME UNKNOWN

Sunday, October 4 Today

WN 4087 · STL → MCI

took off 8:32 AM CT · expected to land 9:15 AM CT (scheduled time unknown)

Forecast issued Sun 7:00 AM ET · 3h before departure

Arrive at MCI more than 15 minutes late?

5% chance · ±0 pts +0 pts · 24h

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

What’s moving the odds

↑ This flight has been late 23% of the time recently

↑ STL is busy at that time

↓ Early flights usually leave on time

↓ Mostly benign weather forecast at STL

Weather at each end

STL (origin) Gusts10 kt Ceilingnone (clear) Visibility10+ mi Precipnone

MCI (destination) Gusts12 kt Ceilingnone (clear) Visibility9 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 4087 · STL → MCI

Odds over time