United Flight UA573 Deals & Information (2025/2026)

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United Flight 573 Route Deals From $77

The cheapest prices found with in the last 7 days for return flights were $151 and $77 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Sep 27 - Sat, Oct 4
BOI
Boise
ORD
O'Hare Intl.
$151 Roundtrip, found 8 hours ago
$151
Roundtrip
found 8 hours ago
Select United flight, departing Sat, Sep 27 from Boise to O'Hare Intl., returning Sat, Oct 4, priced at $151 found 8 hours ago
Wed, Aug 13 - Sat, Aug 16
BOI
Boise
ORD
O'Hare Intl.
$161 Roundtrip, found 6 days ago
$161
Roundtrip
found 6 days ago
Select United flight, departing Wed, Aug 13 from Boise to O'Hare Intl., returning Sat, Aug 16, priced at $161 found 6 days ago
Wed, Sep 3 - Fri, Sep 5
BOI
Boise
ORD
O'Hare Intl.
$182 Roundtrip, found 6 days ago
$182
Roundtrip
found 6 days ago
Select United flight, departing Wed, Sep 3 from Boise to O'Hare Intl., returning Fri, Sep 5, priced at $182 found 6 days ago
Wed, Sep 24 - Tue, Sep 30
BOI
Boise
ORD
O'Hare Intl.
$189 Roundtrip, found 7 hours ago
$189
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Sep 24 from Boise to O'Hare Intl., returning Tue, Sep 30, priced at $189 found 7 hours ago
Wed, Sep 24 - Tue, Sep 30
BOI
Boise
ORD
O'Hare Intl.
$202 Roundtrip, found 7 hours ago
$202
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Sep 24 from Boise to O'Hare Intl., returning Tue, Sep 30, priced at $202 found 7 hours ago
Wed, Sep 24 - Tue, Sep 30
BOI
Boise
ORD
O'Hare Intl.
$205 Roundtrip, found 7 hours ago
$205
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Sep 24 from Boise to O'Hare Intl., returning Tue, Sep 30, priced at $205 found 7 hours ago

Frequently asked questions

What route does flight number UA573 take?
UA573 takes a number of routes. The most frequently flown is between O'Hare Airport and Sky Harbor Intl. Airport (PHX), which flies direct. This service takes around 3 hours and 45 minutes. That said, there may be other flights with this number that are multi-stop.
What terminal does UA573 fly out of?
If you're heading off from O'Hare Airport, you'll probably board the plane from Terminal 1. The most traveled route for flight number UA573 is ORD to Sky Harbor Intl. Airport (PHX), which is a direct flight.
What kind of plane is on flight number UA573?
There's a strong chance you'll be on a Boeing 737-900 if you're traveling from O'Hare Airport to Phoenix Sky Harbor Intl. Airport, a popular route for flight number UA573.
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 UA573 flight with Travelocity, please visit our Customer Service Portal.