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 999 LANDED 7:55 PM CT, ~7 MIN LATE · SCHEDULED TIME UNKNOWN

Tuesday, September 29 Today

WN 999 · BOS → STL

took off 6:34 PM ET · landed 7:55 PM CT (scheduled time unknown)

Forecast issued Tue 9:00 PM ET · 2h after departure

Arrive at STL more than 15 minutes late?

50% chance · ±1 pts +3 pts · 24h

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

What’s moving the odds

↑ 6pm departures from BOS are often late

↑ Later flights pick up delays from earlier in the day

↑ Other factors

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at STL

Weather at each end

BOS (origin) Gusts11 kt Ceiling600 ft Visibility1.5 mi Precip0.01 in

STL (destination) Gusts9 kt Ceilingnone (clear) Visibility10+ 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 999 · BOS → STL

Odds over time