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United Airlines

Is UA4577 delayed?

No delay reported yet. UA4577 is scheduled to leave Philadelphia at 19:56 on Nov 14 and reach Dulles at 20:46 (as of Nov 14, 15:59 UTC).

Usually on time: arrived within 15 min of schedule on 27 of the last 32 flights.

No live update yet

Showing the published schedule until live times come in.

Update time unavailable

Departure

Philadelphia

PHL

Scheduled

Nov 14

Arrival

Dulles

IAD

Scheduled

Nov 14

Times shown in airport local time

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

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual
Not available

Arrival · UTC

Scheduled
Estimated
Not available
Actual
Not available

Route overview: Philadelphia → DullesPHLIAD
Philadelphia → Dulles

Recent arrivals

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

  • Philadelphia → Dulles

    40 min late

  • Philadelphia → Dulles

    29 min early

  • Philadelphia → Dulles

    32 min early

  • Philadelphia → Dulles

    28 min early

  • Dulles → Portland

    17 min early

Is UA4577 usually late?

Period: Oct 15, 2026 – Nov 14, 2026

Arrivals tracked
32
On time
84%
of 32 arrivals
Late
16%
of 32 arrivals
Cancelled
6%
of 34 flights
Median arrival delay
16 min early
9 in 10 arrived within
46 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

Philadelphia (PHL) departures

Left more than 15 min late
8 of 49
Cancelled today
39
Flights from Philadelphia to Dulles today

Dulles (IAD) departures

Left more than 15 min late
17 of 46
Cancelled today
28

Related flights

All United Airlines flights

Flight history and details
UA4577 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Nov 13, 2026CancelledDullesPortlandNot availableNot available
Nov 13, 2026CancelledPhiladelphiaDullesNot availableNot available
Nov 12, 2026ArrivedPhiladelphiaDulles40
Nov 11, 2026ArrivedPhiladelphiaDulles-29
Nov 10, 2026ArrivedPhiladelphiaDulles-32
Nov 9, 2026ArrivedPhiladelphiaDulles-28
Nov 8, 2026ArrivedDullesPortland-17
Nov 8, 2026ArrivedPhiladelphiaDulles-21
Nov 7, 2026ArrivedPhiladelphiaDulles-15
Nov 7, 2026ArrivedDullesPortland60
Nov 5, 2026ArrivedDullesPortland76
Nov 5, 2026ArrivedPhiladelphiaDulles-22
Nov 4, 2026ArrivedPhiladelphiaDulles-30
Nov 3, 2026ArrivedPhiladelphiaDulles-30
Nov 2, 2026ArrivedPhiladelphiaDulles-29
Nov 1, 2026ArrivedDullesPortland3
Nov 1, 2026ArrivedPhiladelphiaDulles-22
Oct 30, 2026ArrivedDullesPortland-24
Oct 30, 2026ArrivedPhiladelphiaDulles-2
Oct 29, 2026ArrivedDullesPortland-10
Oct 29, 2026ArrivedPhiladelphiaDulles-19
Oct 28, 2026ArrivedPhiladelphiaDulles-27
Oct 27, 2026ArrivedPhiladelphiaDulles-19
Oct 26, 2026ArrivedPhiladelphiaDulles1
Oct 25, 2026ArrivedDullesPortland4
Oct 25, 2026ArrivedPhiladelphiaDulles47
Oct 24, 2026ArrivedChicagoWichita-12
Oct 23, 2026ArrivedChicagoWichita8
Oct 21, 2026ArrivedChicagoWichita-15
Oct 20, 2026ArrivedChicagoWichita-14
Oct 19, 2026ArrivedChicagoWichita-35
Oct 17, 2026ArrivedChicagoWichita69
Oct 16, 2026ArrivedChicagoWichita-18
Oct 15, 2026ArrivedChicagoWichita2
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