United Flight 5421 Deals & Information (2026/2027)

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United Flight 5421 Route Deals From $161

The cheapest prices found with in the last 7 days for return flights were $220 and $161 for one-way flights to Preston Smith Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, May 4 - Wed, May 6
DEN
Denver Intl.
LBB
Preston Smith Intl.
$220 Roundtrip, found 1 day ago
$220
Roundtrip
found 1 day ago
Select United flight, departing Mon, May 4 from Denver Intl. to Preston Smith Intl., returning Wed, May 6, priced at $220 found 1 day ago
Mon, May 4 - Wed, May 6
DEN
Denver Intl.
LBB
Preston Smith Intl.
$257 Roundtrip, found 1 day ago
$257
Roundtrip
found 1 day ago
Select United flight, departing Mon, May 4 from Denver Intl. to Preston Smith Intl., returning Wed, May 6, priced at $257 found 1 day 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.