United Flight 573 Deals & Information (2025/2026)

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United Flight 573 Route Deals From $70

The cheapest prices found with in the last 7 days for return flights were $137 and $70 for one-way flights to Seattle - Tacoma Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Oct 4 - Sun, Oct 5
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$137 Roundtrip, found 3 hours ago
$137
Roundtrip
found 3 hours ago
Select United flight, departing Sat, Oct 4 from San Francisco Intl. to Seattle - Tacoma Intl., returning Sun, Oct 5, priced at $137 found 3 hours ago
Sat, Sep 20 - Sun, Sep 28
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$170 Roundtrip, found 3 days ago
$170
Roundtrip
found 3 days ago
Select United flight, departing Sat, Sep 20 from San Francisco Intl. to Seattle - Tacoma Intl., returning Sun, Sep 28, priced at $170 found 3 days ago
Sat, Oct 4 - Sun, Oct 5
SFO
San Francisco Intl.
SEA
Seattle - Tacoma Intl.
$190 Roundtrip, found 3 hours ago
$190
Roundtrip
found 3 hours ago
Select United flight, departing Sat, Oct 4 from San Francisco Intl. to Seattle - Tacoma Intl., returning Sun, Oct 5, priced at $190 found 3 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.