United Flight 4576 Deals & Information (2026/2027)

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United Flight 4576 Route Deals From $166

The cheapest prices found with in the last 7 days for return flights were $282 and $166 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 12 - Mon, Aug 17
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$282 Roundtrip, found 1 hour ago
$282
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Aug 12 from Austin Straubel Intl. to O'Hare Intl., returning Mon, Aug 17, priced at $282 found 1 hour ago
Wed, Aug 12 - Mon, Aug 17
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$296 Roundtrip, found 1 hour ago
$296
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Aug 12 from Austin Straubel Intl. to O'Hare Intl., returning Mon, Aug 17, priced at $296 found 1 hour ago
Wed, Aug 12 - Mon, Aug 17
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$297 Roundtrip, found 1 hour ago
$297
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Aug 12 from Austin Straubel Intl. to O'Hare Intl., returning Mon, Aug 17, priced at $297 found 1 hour ago
Sat, Dec 19 - Sun, Dec 20
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$307 Roundtrip, just found
$307
Roundtrip
just found
Select United flight, departing Sat, Dec 19 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Dec 20, priced at $307 just found
Wed, Aug 12 - Mon, Aug 17
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$311 Roundtrip, found 1 hour ago
$311
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Aug 12 from Austin Straubel Intl. to O'Hare Intl., returning Mon, Aug 17, priced at $311 found 1 hour ago
Thu, Jun 4 - Mon, Jun 8
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$314 Roundtrip, found 5 hours ago
$314
Roundtrip
found 5 hours ago
Select United flight, departing Thu, Jun 4 from Austin Straubel Intl. to O'Hare Intl., returning Mon, Jun 8, priced at $314 found 5 hours ago
Sat, Dec 19 - Sun, Dec 20
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$319 Roundtrip, just found
$319
Roundtrip
just found
Select United flight, departing Sat, Dec 19 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Dec 20, priced at $319 just found
Sat, Dec 19 - Sun, Dec 20
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$322 Roundtrip, just found
$322
Roundtrip
just found
Select United flight, departing Sat, Dec 19 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Dec 20, priced at $322 just found
Thu, Jun 4 - Mon, Jun 8
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$327 Roundtrip, found 5 hours ago
$327
Roundtrip
found 5 hours ago
Select United flight, departing Thu, Jun 4 from Austin Straubel Intl. to O'Hare Intl., returning Mon, Jun 8, priced at $327 found 5 hours ago
Wed, Aug 12 - Mon, Aug 17
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$350 Roundtrip, found 1 hour ago
$350
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Aug 12 from Austin Straubel Intl. to O'Hare Intl., returning Mon, Aug 17, priced at $350 found 1 hour 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.