United Flight 4557 Deals & Information (2026/2027)

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United Flight 4557 Route Deals From $117

The cheapest prices found with in the last 7 days for return flights were $228 and $117 for one-way flights to Lambert-St. Louis Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jul 7 - Thu, Jul 9
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$228 Roundtrip, found 5 days ago
$228
Roundtrip
found 5 days ago
Select United flight, departing Tue, Jul 7 from O'Hare Intl. to Lambert-St. Louis Intl., returning Thu, Jul 9, priced at $228 found 5 days ago
Sat, Jun 13 - Tue, Jun 16
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$233 Roundtrip, found 6 days ago
$233
Roundtrip
found 6 days ago
Select United flight, departing Sat, Jun 13 from O'Hare Intl. to Lambert-St. Louis Intl., returning Tue, Jun 16, priced at $233 found 6 days ago
Wed, Sep 23 - Sun, Sep 27
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$249 Roundtrip, found 5 days ago
$249
Roundtrip
found 5 days ago
Select United flight, departing Wed, Sep 23 from O'Hare Intl. to Lambert-St. Louis Intl., returning Sun, Sep 27, priced at $249 found 5 days ago
Tue, Sep 15 - Fri, Sep 18
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$258 Roundtrip, found 5 days ago
$258
Roundtrip
found 5 days ago
Select United flight, departing Tue, Sep 15 from O'Hare Intl. to Lambert-St. Louis Intl., returning Fri, Sep 18, priced at $258 found 5 days ago
Sat, Aug 1 - Sat, Aug 8
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$279 Roundtrip, found 2 days ago
$279
Roundtrip
found 2 days ago
Select United flight, departing Sat, Aug 1 from O'Hare Intl. to Lambert-St. Louis Intl., returning Sat, Aug 8, priced at $279 found 2 days ago
Sat, Aug 1 - Sat, Aug 8
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$293 Roundtrip, found 2 days ago
$293
Roundtrip
found 2 days ago
Select United flight, departing Sat, Aug 1 from O'Hare Intl. to Lambert-St. Louis Intl., returning Sat, Aug 8, priced at $293 found 2 days ago

Frequently asked questions

What route does flight number UA4557 take?
UA4557 takes 52 minutes to fly non-stop from ORD to Truax Field. We all know there's magic in the destination, but the journey is always half the fun!
What terminal does UA4557 fly out of?
You'll likely be hopping on the plane at Terminal 1 if you're traveling on flight number UA4557 direct from Chicago, IL Airport (ORD-O'Hare Intl.) to MSN.
What kind of plane is on flight number UA4557?
There's every chance you'll find yourself jumping on board a Canadair (Bombardier) Regional Jet 550 if you're booked on flight number UA4557. This flight typically sets off from O'Hare Airport and arrives at Madison, WI Airport (MSN-Dane County Regional).
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 UA4557 flight with Travelocity, please visit our Customer Service Portal.