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 3900 LANDED 10:18 PM CT, ~6 MIN LATE · SCHEDULED TIME UNKNOWN

Friday, October 2

UA 3900 · DEN → IAH

took off 7:28 PM MT · landed 10:18 PM CT (scheduled time unknown)

Forecast issued Fri 10:00 PM ET · 1h after departure

Arrive at IAH more than 15 minutes late?

47% chance · ±1 pts – · 24h

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

What’s moving the odds

↑ Visibility down to 1 mi, 2.7 in of rain forecast at IAH that day

↑ 7pm departures from DEN are often late

↑ Other factors

↓ Mostly benign weather forecast at DEN

↓ DEN usually runs smoothly

Weather at each end

DEN (origin) Gusts17 kt Ceilingnone (clear) Visibility10+ mi Precipnone

IAH (destination) Gusts22 kt Ceiling2,400 ft Visibility1 mi Precip1.47 in

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 3900 · DEN → IAH

Odds over time