United Flight UA4576 Deals & Information (2025/2026)

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United Flight 4576 Route Deals From $210

The cheapest prices found with in the last 7 days for return flights were $186 and $210 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 4 - Thu, Nov 13
PHL
Philadelphia Intl.
IAD
Washington Dulles Intl.
$186 Roundtrip, found 3 days ago
$186
Roundtrip
found 3 days ago
Select United flight, departing Tue, Nov 4 from Philadelphia Intl. to Washington Dulles Intl., returning Thu, Nov 13, priced at $186 found 3 days ago
Fri, Jul 18 - Sun, Jul 20
PHL
Philadelphia Intl.
IAD
Washington Dulles Intl.
$203 Roundtrip, found 2 days ago
$203
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jul 18 from Philadelphia Intl. to Washington Dulles Intl., returning Sun, Jul 20, priced at $203 found 2 days ago
Tue, Nov 4 - Thu, Nov 13
PHL
Philadelphia Intl.
IAD
Washington Dulles Intl.
$246 Roundtrip, found 3 days ago
$246
Roundtrip
found 3 days ago
Select United flight, departing Tue, Nov 4 from Philadelphia Intl. to Washington Dulles Intl., returning Thu, Nov 13, priced at $246 found 3 days ago
Fri, Jul 25 - Sun, Jul 27
PHL
Philadelphia Intl.
IAD
Washington Dulles Intl.
$290 Roundtrip, found 4 days ago
$290
Roundtrip
found 4 days ago
Select United flight, departing Fri, Jul 25 from Philadelphia Intl. to Washington Dulles Intl., returning Sun, Jul 27, priced at $290 found 4 days ago

Frequently asked questions

What route does flight number UA4576 take?
Flight number UA4576 operates non-stop from ACK to Newark, NJ Airport (EWR-Liberty Intl.). During this trip, you'll be in the air for approximately 1 hour and 40 minutes. Consider booking ahead to lock in your favorite seat.
What kind of plane is on flight number UA4576?
There's every chance you'll be cruising aboard the Canadair (Bombardier) Regional Jet 550 if you have a seat on flight UA4576. Typically, this flight leaves from Nantucket, MA Airport (ACK-Nantucket Memorial) and comes in to land at EWR.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA4576 flight with Travelocity, please visit our Customer Service Portal.