United Flight 321 Deals & Information (2025/2026)

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United Flight 321 Route Deals From $533

The cheapest prices found with in the last 7 days for return flights were $595 and $533 for one-way flights to Marco Polo for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Oct 8 - Wed, Oct 15
IAD
Washington Dulles Intl.
VCE
Marco Polo
$595 Roundtrip, found 6 days ago
$595
Roundtrip
found 6 days ago
Select United flight, departing Wed, Oct 8 from Washington Dulles Intl. to Marco Polo, returning Wed, Oct 15, priced at $595 found 6 days ago
Tue, Aug 12 - Wed, Aug 20
IAD
Washington Dulles Intl.
VCE
Marco Polo
$636 Roundtrip, found 18 hours ago
$636
Roundtrip
found 18 hours ago
Select United flight, departing Tue, Aug 12 from Washington Dulles Intl. to Marco Polo, returning Wed, Aug 20, priced at $636 found 18 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.