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 3813 LANDED 4:20 PM ET, ~4 MIN LATE · SCHEDULED TIME UNKNOWN

Tuesday, September 29 Yesterday

WN 3813 · STL → BWI

took off 1:40 PM CT · landed 4:20 PM ET (scheduled time unknown)

Forecast issued Tue 10:00 PM ET · 7h after departure

Arrive at BWI more than 15 minutes late?

25% chance · ±0 pts – · 24h

HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.

What’s moving the odds

↑ Other factors

↑ Arrivals into BWI at that hour are often late

↑ WN's recent on-time record

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at STL

Weather at each end

STL (origin) Gusts9 kt Ceilingnone (clear) Visibility10+ mi Precipnone

BWI (destination) Gusts7 kt Ceiling3,600 ft Visibility9.2 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 3813 · STL → BWI

Odds over time