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United Airlines

Is UA3991 delayed?

No, UA3991 landed in Dulles on schedule (14 min behind), at 12:01 on Nov 13 (as of Nov 13, 17:01 UTC).

Usually on time: arrived within 15 min of schedule on 17 of the last 19 flights.

Arrived

On schedule (14 min behind)

Official source · Updated

Departure

Buffalo

BUF

Actual

Scheduled 10:35

Nov 13

Arrival

Dulles

IAD

Actual

Scheduled 11:48

Nov 13

Times shown in airport local time

Service date: · Scheduled departure date (America/New_York)

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual

Arrival · UTC

Scheduled
Estimated
Not available
Actual

Recent arrivals

Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.

  • Buffalo → Dulles

    On schedule (14 min behind)

  • Buffalo → Dulles

    9 min early

  • Buffalo → Dulles

    66 min late

  • Buffalo → Dulles

    48 min late

  • Buffalo → Dulles

    19 min early

Is UA3991 usually late?

Period: Oct 15, 2026 – Nov 14, 2026

Arrivals tracked
19
On time
89%
of 19 arrivals
Late
11%
of 19 arrivals
Cancelled
0%
of 19 flights
Median arrival delay
12 min early
9 in 10 arrived within
20 min

On time means arriving no more than 15 minutes after the scheduled time; late means more than 15 minutes after. Cancelled and diverted flights are counted apart from arrivals. Compares scheduled and actual arrival times. Cancelled and diverted flights are left out. Some flights may be missing.

How flight status works

At the airports today

Dulles (IAD) departures

Left more than 15 min late
18 of 47
Cancelled today
28

Related flights

All United Airlines flights

Flight history and details
UA3991 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Nov 13, 2026ArrivedBuffaloDulles14
Nov 12, 2026ArrivedBuffaloDulles-9
Nov 9, 2026ArrivedBuffaloDulles66
Nov 6, 2026ArrivedBuffaloDulles48
Nov 5, 2026ArrivedBuffaloDulles-19
Nov 2, 2026ArrivedBuffaloDulles-21
Oct 30, 2026ArrivedBuffaloDulles-13
Oct 29, 2026ArrivedBuffaloDulles-9
Oct 26, 2026ArrivedBuffaloDulles-10
Oct 24, 2026ArrivedBirminghamHouston-6
Oct 23, 2026ArrivedBirminghamHouston-19
Oct 22, 2026ArrivedBirminghamHouston-20
Oct 21, 2026ArrivedBirminghamHouston-22
Oct 20, 2026ArrivedBirminghamHouston-14
Oct 19, 2026ArrivedBirminghamHouston-6
Oct 18, 2026ArrivedBirminghamHouston-20
Oct 17, 2026ArrivedBirminghamHouston-11
Oct 16, 2026ArrivedBirminghamHouston-18
Oct 15, 2026ArrivedBirminghamHouston-24
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