United Flight 5421 Deals & Information (2026/2027)

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United Flight 5421 Route Deals From $118

The cheapest prices found with in the last 7 days for return flights were $287 and $118 for one-way flights to Preston Smith Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Feb 6 - Sun, Feb 8
DEN
Denver Intl.
LBB
Preston Smith Intl.
$287 Roundtrip, found 7 hours ago
$287
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Feb 6 from Denver Intl. to Preston Smith Intl., returning Sun, Feb 8, priced at $287 found 7 hours ago
Wed, Jan 28 - Thu, Jan 29
DEN
Denver Intl.
LBB
Preston Smith Intl.
$300 Roundtrip, found 1 day ago
$300
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jan 28 from Denver Intl. to Preston Smith Intl., returning Thu, Jan 29, priced at $300 found 1 day ago
Fri, Feb 6 - Sun, Feb 8
DEN
Denver Intl.
LBB
Preston Smith Intl.
$305 Roundtrip, found 7 hours ago
$305
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Feb 6 from Denver Intl. to Preston Smith Intl., returning Sun, Feb 8, priced at $305 found 7 hours ago
Wed, Jan 28 - Thu, Jan 29
DEN
Denver Intl.
LBB
Preston Smith Intl.
$313 Roundtrip, found 1 day ago
$313
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jan 28 from Denver Intl. to Preston Smith Intl., returning Thu, Jan 29, priced at $313 found 1 day ago
Fri, Feb 6 - Sun, Feb 8
DEN
Denver Intl.
LBB
Preston Smith Intl.
$317 Roundtrip, found 7 hours ago
$317
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Feb 6 from Denver Intl. to Preston Smith Intl., returning Sun, Feb 8, priced at $317 found 7 hours ago
Fri, Feb 6 - Sun, Feb 8
DEN
Denver Intl.
LBB
Preston Smith Intl.
$354 Roundtrip, found 7 hours ago
$354
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Feb 6 from Denver Intl. to Preston Smith Intl., returning Sun, Feb 8, priced at $354 found 7 hours ago
Fri, Feb 6 - Sun, Feb 8
DEN
Denver Intl.
LBB
Preston Smith Intl.
$360 Roundtrip, found 7 hours ago
$360
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Feb 6 from Denver Intl. to Preston Smith Intl., returning Sun, Feb 8, priced at $360 found 7 hours 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.