United Flight 255 Deals & Information (2026/2027)

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United Flight 255 Route Deals From $149

The cheapest prices found with in the last 7 days for return flights were $197 and $149 for one-way flights to Boise for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Oct 22 - Sat, Oct 24
DEN
Denver Intl.
BOI
Boise
$197 Roundtrip, found 4 hours ago
$197
Roundtrip
found 4 hours ago
Select United flight, departing Thu, Oct 22 from Denver Intl. to Boise, returning Sat, Oct 24, priced at $197 found 4 hours ago
Wed, Nov 4 - Sat, Nov 7
DEN
Denver Intl.
BOI
Boise
$200 Roundtrip, found 17 hours ago
$200
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Nov 4 from Denver Intl. to Boise, returning Sat, Nov 7, priced at $200 found 17 hours ago
Wed, Oct 21 - Sat, Oct 24
DEN
Denver Intl.
BOI
Boise
$210 Roundtrip, found 6 days ago
$210
Roundtrip
found 6 days ago
Select United flight, departing Wed, Oct 21 from Denver Intl. to Boise, returning Sat, Oct 24, priced at $210 found 6 days ago
Thu, Dec 3 - Mon, Dec 7
DEN
Denver Intl.
BOI
Boise
$223 Roundtrip, found 13 hours ago
$223
Roundtrip
found 13 hours ago
Select United flight, departing Thu, Dec 3 from Denver Intl. to Boise, returning Mon, Dec 7, priced at $223 found 13 hours ago
Wed, Nov 4 - Sat, Nov 7
DEN
Denver Intl.
BOI
Boise
$224 Roundtrip, found 17 hours ago
$224
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Nov 4 from Denver Intl. to Boise, returning Sat, Nov 7, priced at $224 found 17 hours ago
Wed, Oct 7 - Wed, Oct 14
DEN
Denver Intl.
BOI
Boise
$232 Roundtrip, found 12 hours ago
$232
Roundtrip
found 12 hours ago
Select United flight, departing Wed, Oct 7 from Denver Intl. to Boise, returning Wed, Oct 14, priced at $232 found 12 hours ago
Thu, Oct 22 - Sat, Oct 24
DEN
Denver Intl.
BOI
Boise
$247 Roundtrip, found 4 hours ago
$247
Roundtrip
found 4 hours ago
Select United flight, departing Thu, Oct 22 from Denver Intl. to Boise, returning Sat, Oct 24, priced at $247 found 4 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.