Tracked live by the FAA. The scheduled times shown are from a typical Tuesday because the FAA's flight plan was first seen after takeoff.

UNITED · FLIGHT UA 521 LANDED 12:08 AM ET, ~47 MIN LATE

Tuesday, September 29

UA 521 · IAH → BOS

took off 7:40 PM CT · landed 12:08 AM ET (scheduled 6:26 PM CT → 11:30 PM ET)

Forecast issued Tue 10:00 PM ET · 3h after departure

Arrive at BOS more than 15 minutes late?

Late chance · ±2 pts +4 pts · 24h

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

How late did it get to BOS?

RESOLVED

On time or early
–
15–30 min late
–
30 min–1 hour late
✓
1–2 hours late
–
Over 2 hours late
–

Gate arrival compared with the scheduled arrival. The ranges add up to 100%.

What’s moving the odds

↑ Cloud base down to 600 ft, visibility down to 1.5 mi forecast at BOS that day

↑ Arrivals into BOS at that hour are often late

↑ 6pm departures from IAH are often late

↓ Tuesdays in September are usually quieter than average

↓ Other factors

Weather at each end

IAH (origin) Gusts26 kt Ceiling4,000 ft Visibility10+ mi Precipnone

BOS (destination) Gusts11 kt Ceiling600 ft Visibility1.5 mi Precip0.03 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 521 · IAH → BOS

Odds over time

How late did it get to BOS?