United Flight 255 Deals & Information (2026/2027)

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United Flight 255 Route Deals From $103

The cheapest prices found with in the last 7 days for return flights were $197 and $103 for one-way flights to Boise for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Jan 16 - Tue, Jan 19
DEN
Denver Intl.
BOI
Boise
$197 Roundtrip, just found
$197
Roundtrip
just found
Select United flight, departing Sat, Jan 16 from Denver Intl. to Boise, returning Tue, Jan 19, priced at $197 just found
Tue, Sep 29 - Wed, Sep 30
DEN
Denver Intl.
BOI
Boise
$200 Roundtrip, found 2 hours ago
$200
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Sep 29 from Denver Intl. to Boise, returning Wed, Sep 30, priced at $200 found 2 hours ago
Thu, Oct 29 - Wed, Nov 4
DEN
Denver Intl.
BOI
Boise
$212 Roundtrip, found 5 hours ago
$212
Roundtrip
found 5 hours ago
Select United flight, departing Thu, Oct 29 from Denver Intl. to Boise, returning Wed, Nov 4, priced at $212 found 5 hours ago
Wed, Sep 23 - Wed, Sep 30
DEN
Denver Intl.
BOI
Boise
$222 Roundtrip, found 1 day ago
$222
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 23 from Denver Intl. to Boise, returning Wed, Sep 30, priced at $222 found 1 day ago
Tue, Sep 29 - Wed, Sep 30
DEN
Denver Intl.
BOI
Boise
$225 Roundtrip, found 2 hours ago
$225
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Sep 29 from Denver Intl. to Boise, returning Wed, Sep 30, priced at $225 found 2 hours ago
Mon, Oct 5 - Mon, Oct 12
DEN
Denver Intl.
BOI
Boise
$228 Roundtrip, found 1 day ago
$228
Roundtrip
found 1 day ago
Select United flight, departing Mon, Oct 5 from Denver Intl. to Boise, returning Mon, Oct 12, priced at $228 found 1 day ago
Sat, Jan 16 - Tue, Jan 19
DEN
Denver Intl.
BOI
Boise
$237 Roundtrip, just found
$237
Roundtrip
just found
Select United flight, departing Sat, Jan 16 from Denver Intl. to Boise, returning Tue, Jan 19, priced at $237 just found

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.