United Flight UA4573 Deals & Information (2025/2026)

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United Flight 4573 Route Deals From $126

The cheapest prices found with in the last 7 days for return flights were $183 and $126 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$183 Roundtrip, found 1 day ago
$183
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $183 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$192 Roundtrip, found 1 day ago
$192
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $192 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $201 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$218 Roundtrip, found 1 day ago
$218
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $218 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$227 Roundtrip, found 1 day ago
$227
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $227 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$252 Roundtrip, found 1 day ago
$252
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $252 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$253 Roundtrip, found 1 day ago
$253
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $253 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$253 Roundtrip, found 1 day ago
$253
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $253 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$262 Roundtrip, found 1 day ago
$262
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $262 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$272 Roundtrip, found 1 day ago
$272
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $272 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$279 Roundtrip, found 1 day ago
$279
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $279 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$280 Roundtrip, found 1 day ago
$280
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $280 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$282 Roundtrip, found 1 day ago
$282
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $282 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$288 Roundtrip, found 1 day ago
$288
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $288 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
MLI
Quad City Intl.
ORD
O'Hare Intl.
$306 Roundtrip, found 1 day ago
$306
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Quad City Intl. to O'Hare Intl., returning Wed, Oct 22, priced at $306 found 1 day ago

Frequently asked questions

What route does flight number UA4573 take?
UA4573 flies non-stop from Nantucket Memorial Airport to Washington Dulles Intl. Airport (IAD). During this journey, expect to be in the air for around 1 hour and 53 minutes. It's wise to book ahead to secure your favorite seat.
What kind of plane is on flight number UA4573?
The route for flight number UA4573 is usually Nantucket Memorial Airport (ACK) to IAD, and the Canadair (Bombardier) Regional Jet 550 is the aircraft model you'll probably be flying with.
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 UA4573 flight with Travelocity, please visit our Customer Service Portal.