United Flight 5421 Deals & Information (2025/2026)

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United Flight 5421 Route Deals From $71

The cheapest prices found with in the last 7 days for return flights were $140 and $71 for one-way flights to Preston Smith Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Aug 14 - Tue, Aug 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$140 Roundtrip, found 1 day ago
$140
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 14 from Denver Intl. to Preston Smith Intl., returning Tue, Aug 19, priced at $140 found 1 day ago
Thu, Aug 14 - Tue, Aug 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$149 Roundtrip, found 1 day ago
$149
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 14 from Denver Intl. to Preston Smith Intl., returning Tue, Aug 19, priced at $149 found 1 day ago
Thu, Aug 14 - Tue, Aug 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 14 from Denver Intl. to Preston Smith Intl., returning Tue, Aug 19, priced at $201 found 1 day ago
Sat, Nov 8 - Mon, Nov 10
DEN
Denver Intl.
LBB
Preston Smith Intl.
$204 Roundtrip, found 6 days ago
$204
Roundtrip
found 6 days ago
Select United flight, departing Sat, Nov 8 from Denver Intl. to Preston Smith Intl., returning Mon, Nov 10, priced at $204 found 6 days ago
Thu, Aug 14 - Tue, Aug 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$216 Roundtrip, found 1 day ago
$216
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 14 from Denver Intl. to Preston Smith Intl., returning Tue, Aug 19, priced at $216 found 1 day ago
Sun, Nov 9 - Mon, Nov 10
DEN
Denver Intl.
LBB
Preston Smith Intl.
$231 Roundtrip, found 6 days ago
$231
Roundtrip
found 6 days ago
Select United flight, departing Sun, Nov 9 from Denver Intl. to Preston Smith Intl., returning Mon, Nov 10, priced at $231 found 6 days ago

Frequently asked questions

What route does flight number UA5421 take?
UA5421 serves multiple routes, but the most common is between Fresno Yosemite Intl. Airport and Los Angeles Intl. Airport (LAX). If your flight goes direct, you'll disembark the plane in about 1 hour and 14 minutes. Multi-stop flights can also use this number, as can flights on other routes.
What kind of plane is on flight number UA5421?
UA5421 is a flight number that is used on a number of different routes. If you've booked a ticket on the busiest route, FAT to Los Angeles, CA Airport (LAX-Los Angeles Intl.), there's every chance you'll be hopping on board a Bombardier CRJ.
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 UA5421 flight with Travelocity, please visit our Customer Service Portal.