United Flight 5421 Deals & Information (2025/2026)

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United Flight 5421 Route Deals From $98

The cheapest prices found with in the last 7 days for return flights were $262 and $98 for one-way flights to Preston Smith Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Oct 17 - Sun, Oct 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$262 Roundtrip, found 12 hours ago
$262
Roundtrip
found 12 hours ago
Select United flight, departing Fri, Oct 17 from Denver Intl. to Preston Smith Intl., returning Sun, Oct 19, priced at $262 found 12 hours ago
Fri, Oct 17 - Sun, Oct 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$293 Roundtrip, found 12 hours ago
$293
Roundtrip
found 12 hours ago
Select United flight, departing Fri, Oct 17 from Denver Intl. to Preston Smith Intl., returning Sun, Oct 19, priced at $293 found 12 hours ago
Fri, Oct 24 - Mon, Oct 27
DEN
Denver Intl.
LBB
Preston Smith Intl.
$310 Roundtrip, found 3 days ago
$310
Roundtrip
found 3 days ago
Select United flight, departing Fri, Oct 24 from Denver Intl. to Preston Smith Intl., returning Mon, Oct 27, priced at $310 found 3 days ago
Fri, Oct 17 - Sun, Oct 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$329 Roundtrip, found 12 hours ago
$329
Roundtrip
found 12 hours ago
Select United flight, departing Fri, Oct 17 from Denver Intl. to Preston Smith Intl., returning Sun, Oct 19, priced at $329 found 12 hours ago
Fri, Oct 24 - Mon, Oct 27
DEN
Denver Intl.
LBB
Preston Smith Intl.
$340 Roundtrip, found 3 days ago
$340
Roundtrip
found 3 days ago
Select United flight, departing Fri, Oct 24 from Denver Intl. to Preston Smith Intl., returning Mon, Oct 27, priced at $340 found 3 days ago
Fri, Oct 17 - Sun, Oct 19
DEN
Denver Intl.
LBB
Preston Smith Intl.
$434 Roundtrip, found 12 hours ago
$434
Roundtrip
found 12 hours ago
Select United flight, departing Fri, Oct 17 from Denver Intl. to Preston Smith Intl., returning Sun, Oct 19, priced at $434 found 12 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.