United Flight 255 Deals & Information (2026/2027)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 255 Route Deals From $258

The cheapest prices found with in the last 7 days for return flights were $269 and $258 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jul 3 - Tue, Jul 7
ATW
Appleton Intl.
DEN
Denver Intl.
$269 Roundtrip, found 22 hours ago
$269
Roundtrip
found 22 hours ago
Select United flight, departing Fri, Jul 3 from Appleton Intl. to Denver Intl., returning Tue, Jul 7, priced at $269 found 22 hours ago
Wed, Nov 25 - Wed, Dec 2
ATW
Appleton Intl.
DEN
Denver Intl.
$279 Roundtrip, found 18 hours ago
$279
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Nov 25 from Appleton Intl. to Denver Intl., returning Wed, Dec 2, priced at $279 found 18 hours ago
Wed, Nov 25 - Wed, Dec 2
ATW
Appleton Intl.
DEN
Denver Intl.
$301 Roundtrip, found 18 hours ago
$301
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Nov 25 from Appleton Intl. to Denver Intl., returning Wed, Dec 2, priced at $301 found 18 hours ago
Wed, Sep 30 - Wed, Oct 7
ATW
Appleton Intl.
DEN
Denver Intl.
$303 Roundtrip, found 1 day ago
$303
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 30 from Appleton Intl. to Denver Intl., returning Wed, Oct 7, priced at $303 found 1 day ago
Wed, Nov 25 - Wed, Dec 2
ATW
Appleton Intl.
DEN
Denver Intl.
$310 Roundtrip, found 18 hours ago
$310
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Nov 25 from Appleton Intl. to Denver Intl., returning Wed, Dec 2, priced at $310 found 18 hours ago
Sat, Jan 16 - Wed, Jan 20
ATW
Appleton Intl.
DEN
Denver Intl.
$315 Roundtrip, found 3 days ago
$315
Roundtrip
found 3 days ago
Select United flight, departing Sat, Jan 16 from Appleton Intl. to Denver Intl., returning Wed, Jan 20, priced at $315 found 3 days ago
Mon, Feb 15 - Sat, Feb 20
ATW
Appleton Intl.
DEN
Denver Intl.
$318 Roundtrip, found 3 days ago
$318
Roundtrip
found 3 days ago
Select United flight, departing Mon, Feb 15 from Appleton Intl. to Denver Intl., returning Sat, Feb 20, priced at $318 found 3 days ago
Sat, Jan 16 - Wed, Jan 20
ATW
Appleton Intl.
DEN
Denver Intl.
$324 Roundtrip, found 3 days ago
$324
Roundtrip
found 3 days ago
Select United flight, departing Sat, Jan 16 from Appleton Intl. to Denver Intl., returning Wed, Jan 20, priced at $324 found 3 days ago
Fri, Jul 17 - Fri, Jul 24
ATW
Appleton Intl.
DEN
Denver Intl.
$331 Roundtrip, found 1 day ago
$331
Roundtrip
found 1 day ago
Select United flight, departing Fri, Jul 17 from Appleton Intl. to Denver Intl., returning Fri, Jul 24, priced at $331 found 1 day ago
Wed, Nov 25 - Wed, Dec 2
ATW
Appleton Intl.
DEN
Denver Intl.
$332 Roundtrip, found 18 hours ago
$332
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Nov 25 from Appleton Intl. to Denver Intl., returning Wed, Dec 2, priced at $332 found 18 hours ago

Frequently asked questions

What route does flight number UA255 take?
UA255 takes numerous routes. The most frequently flown is Austin, TX Airport (AUS-Austin-Bergstrom Intl.) to IAD, which is a direct flight. This flight generally takes 3 hours and 12 minutes. However, there are likely to be other flights with this number that are multi-stop.
How often is UA255 on time?
United Airlines flight number UA255 from Austin-Bergstrom Intl. Airport (AUS) to IAD arrives on schedule 85% of the time, which means you can be confident you will reach where you need to go ASAP. When it is running behind schedule, it is generally delayed by 49 minutes. This service has a 2.25-star rating.
What kind of plane is on flight number UA255?
There's every chance you'll be aboard the Airbus A319 if you're traveling from Austin-Bergstrom Intl. Airport (AUS) to IAD, one of several routes used for flight number UA255.
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 UA255 flight with Travelocity, please visit our Customer Service Portal.