United Flight UA321 Deals & Information (2025/2026)

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United Flight 321 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $637 and for one-way flights to Marco Polo for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Sep 7 - Tue, Sep 16
IAD
Washington Dulles Intl.
VCE
Marco Polo
$637 Roundtrip, found 14 hours ago
$637
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Sep 7 from Washington Dulles Intl. to Marco Polo, returning Tue, Sep 16, priced at $637 found 14 hours ago

Frequently asked questions

What route does flight number UA321 take?
UA321 is used on a range of routes. Mostly, UA321 flies direct from Fresno Yosemite Intl. Airport (FAT) to Denver Intl. Airport (DEN). If this is your route, you'll be up above the clouds for 2 hours and 14 minutes.
What kind of plane is on flight number UA321?
UA321 is a flight number that serves many different routes. If you're heading off on the most popular one, FAT to DIA airport, you're likely to be cruising aboard an Airbus A319.
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 UA321 flight with Travelocity, please visit our Customer Service Portal.