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.

UNITED · FLIGHT UA 8121 LANDED 2:24 PM ET, ~2 MIN LATE · SCHEDULED TIME UNKNOWN

Tuesday, September 29

UA 8121 · FLL → IAD

took off 12:29 PM ET · landed 2:24 PM ET (scheduled time unknown)

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

Arrive at IAD more than 15 minutes late?

39% chance · ±0 pts – · 24h

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

What’s moving the odds

↑ Gusts to 29 kt, visibility down to 0.5 mi, 2.2 in of rain, thunderstorms forecast at FLL that day

↑ 12pm departures from FLL are often late

↑ Other factors

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at IAD

Weather at each end

FLL (origin) Gusts29 kt Ceiling2,500 ft Visibility0.5 mi Precip2.21 in

IAD (destination) Gusts9 kt Ceiling4,200 ft Visibility8.8 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.

UA 8121 · FLL → IAD

Odds over time