United Flight 2123 Deals & Information (2025/2026)

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United Flight 2123 Route Deals From $90

The cheapest prices found with in the last 7 days for return flights were $175 and $90 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 20 - Thu, Sep 11
MCI
Kansas City Intl.
DEN
Denver Intl.
$175 Roundtrip, found 3 days ago
$175
Roundtrip
found 3 days ago
Select United flight, departing Wed, Aug 20 from Kansas City Intl. to Denver Intl., returning Thu, Sep 11, priced at $175 found 3 days ago
Sat, Jul 26 - Wed, Jul 30
MCI
Kansas City Intl.
DEN
Denver Intl.
$179 Roundtrip, found 1 day ago
$179
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jul 26 from Kansas City Intl. to Denver Intl., returning Wed, Jul 30, priced at $179 found 1 day ago
Thu, Aug 14 - Sun, Aug 17
MCI
Kansas City Intl.
DEN
Denver Intl.
$180 Roundtrip, found 5 hours ago
$180
Roundtrip
found 5 hours ago
Select United flight, departing Thu, Aug 14 from Kansas City Intl. to Denver Intl., returning Sun, Aug 17, priced at $180 found 5 hours ago
Sat, Jul 26 - Wed, Jul 30
MCI
Kansas City Intl.
DEN
Denver Intl.
$180 Roundtrip, found 1 day ago
$180
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jul 26 from Kansas City Intl. to Denver Intl., returning Wed, Jul 30, priced at $180 found 1 day ago
Thu, Aug 14 - Fri, Aug 15
MCI
Kansas City Intl.
DEN
Denver Intl.
$181 Roundtrip, found 6 days ago
$181
Roundtrip
found 6 days ago
Select United flight, departing Thu, Aug 14 from Kansas City Intl. to Denver Intl., returning Fri, Aug 15, priced at $181 found 6 days ago
Thu, Sep 11 - Fri, Sep 12
MCI
Kansas City Intl.
DEN
Denver Intl.
$203 Roundtrip, found 3 hours ago
$203
Roundtrip
found 3 hours ago
Select United flight, departing Thu, Sep 11 from Kansas City Intl. to Denver Intl., returning Fri, Sep 12, priced at $203 found 3 hours ago

Frequently asked questions

What route does flight number UA2123 take?
UA2123 takes 3 hours and 39 minutes to fly direct from Austin-Bergstrom Intl. Airport (AUS) to San Francisco Airport. Sure, there's magic in the destination, but the journey is always half the fun!
What kind of plane is on flight number UA2123?
The route for flight number UA2123 is generally Austin, TX Airport (AUS-Austin-Bergstrom Intl.) to San Francisco Intl. Airport (SFO), and the Airbus A319 is the type of plane you're likely to be flying with.
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 UA2123 flight with Travelocity, please visit our Customer Service Portal.