United Flight 4576 Deals & Information (2026/2027)

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United Flight 4576 Route Deals From $177

The cheapest prices found with in the last 7 days for return flights were $252 and $177 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 3 - Sun, Sep 6
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$252 Roundtrip, found 5 days ago
$252
Roundtrip
found 5 days ago
Select United flight, departing Thu, Sep 3 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Sep 6, priced at $252 found 5 days ago
Sat, May 30 - Sat, Jun 6
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$254 Roundtrip, found 3 days ago
$254
Roundtrip
found 3 days ago
Select United flight, departing Sat, May 30 from Austin Straubel Intl. to O'Hare Intl., returning Sat, Jun 6, priced at $254 found 3 days ago
Sat, May 30 - Sat, Jun 6
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$267 Roundtrip, found 3 days ago
$267
Roundtrip
found 3 days ago
Select United flight, departing Sat, May 30 from Austin Straubel Intl. to O'Hare Intl., returning Sat, Jun 6, priced at $267 found 3 days ago
Sat, May 30 - Sat, Jun 6
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$269 Roundtrip, found 3 days ago
$269
Roundtrip
found 3 days ago
Select United flight, departing Sat, May 30 from Austin Straubel Intl. to O'Hare Intl., returning Sat, Jun 6, priced at $269 found 3 days ago
Sat, Jun 13 - Sun, Jun 14
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$278 Roundtrip, found 5 days ago
$278
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jun 13 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Jun 14, priced at $278 found 5 days ago
Wed, Jul 15 - Tue, Jul 21
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$282 Roundtrip, found 2 days ago
$282
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jul 15 from Austin Straubel Intl. to O'Hare Intl., returning Tue, Jul 21, priced at $282 found 2 days ago
Thu, Sep 3 - Sun, Sep 6
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$295 Roundtrip, found 5 days ago
$295
Roundtrip
found 5 days ago
Select United flight, departing Thu, Sep 3 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Sep 6, priced at $295 found 5 days ago
Wed, Jul 15 - Tue, Jul 21
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$296 Roundtrip, found 2 days ago
$296
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jul 15 from Austin Straubel Intl. to O'Hare Intl., returning Tue, Jul 21, priced at $296 found 2 days ago
Sat, May 30 - Sat, Jun 6
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$297 Roundtrip, found 3 days ago
$297
Roundtrip
found 3 days ago
Select United flight, departing Sat, May 30 from Austin Straubel Intl. to O'Hare Intl., returning Sat, Jun 6, priced at $297 found 3 days ago
Thu, Sep 3 - Sun, Sep 6
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$308 Roundtrip, found 5 days ago
$308
Roundtrip
found 5 days ago
Select United flight, departing Thu, Sep 3 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Sep 6, priced at $308 found 5 days ago
Wed, Jul 15 - Tue, Jul 21
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$313 Roundtrip, found 2 days ago
$313
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jul 15 from Austin Straubel Intl. to O'Hare Intl., returning Tue, Jul 21, priced at $313 found 2 days ago
Sat, Jun 13 - Sun, Jun 14
GRB
Austin Straubel Intl.
ORD
O'Hare Intl.
$315 Roundtrip, found 5 days ago
$315
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jun 13 from Austin Straubel Intl. to O'Hare Intl., returning Sun, Jun 14, priced at $315 found 5 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.