$104 Cheap United flights St. Louis (STL) to Las Vegas (LAS)

View $104 flight on Wed, Aug 13, 2025Opens in a new window

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$104 Cheap United flights St. Louis (STL) to Las Vegas (LAS)

Prices were available within the past 7 days and start at $104 for one-way flights and $196 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Sep 23 - Thu, Oct 2
STL
St. Louis
LAS
Las Vegas
$196 Roundtrip, found 19 hours ago
$196
Roundtrip
found 19 hours ago
Select United flight, departing Tue, Sep 23 from St. Louis to Las Vegas, returning Thu, Oct 2, priced at $196 found 19 hours ago
United
Thu, Aug 14 - Sat, Aug 16
STL
St. Louis
LAS
Las Vegas
$200 Roundtrip, just found
$200
Roundtrip
just found
Select United flight, departing Thu, Aug 14 from St. Louis to Las Vegas, returning Sat, Aug 16, priced at $200 just found
United
Tue, Aug 26 - Wed, Aug 27
STL
St. Louis
LAS
Las Vegas
$202 Roundtrip, found 3 hours ago
$202
Roundtrip
found 3 hours ago
Select United flight, departing Tue, Aug 26 from St. Louis to Las Vegas, returning Wed, Aug 27, priced at $202 found 3 hours ago
United
Thu, Aug 21 - Sun, Aug 24
STL
St. Louis
LAS
Las Vegas
$211 Roundtrip, just found
$211
Roundtrip
just found
Select United flight, departing Thu, Aug 21 from St. Louis to Las Vegas, returning Sun, Aug 24, priced at $211 just found
United
Wed, Nov 5 - Sat, Nov 8
STL
St. Louis
LAS
Las Vegas
$220 Roundtrip, found 1 hour ago
$220
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Nov 5 from St. Louis to Las Vegas, returning Sat, Nov 8, priced at $220 found 1 hour ago
Flights from St. Louis (STL) to Las Vegas (LAS)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Harry Reid Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Popular airline
American Airlines
Distance
1368 mi
Average flight time
1 hour 35 mins

Frequently asked questions

How much is a United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
You'll find affordable return United Airlines flights from $196 from STL to LAS by filtering your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $104 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from STL to LAS with United Airlines?
January is one of the cheapest months to jet away to Las Vegas with United Airlines. You could also find excellent prices on return and one-way tickets in June.
What is the cheapest time to book flights from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS) with United Airlines?
Begin your search one to three months before your departure to get cheaper fares on United Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing spot on, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
To figure out if there's a direct trip from STL to LAS with United Airlines or any other carriers, select the "Nonstop" filter when browsing for tickets.
What is the earliest United Airlines flight from STL to LAS?
To find the earliest departure from STL to LAS with United Airlines, filter your search by "Early Morning" and "Morning." Booking an early flight generally means you'll experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Las Vegas?
Jump on a United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Las Vegas, and you'll most likely touch down at Harry Reid Intl. Airport (LAS). This is the airline's main hub here.
Why fly with United Airlines from STL to LAS?
A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to jet off from STL to LAS with United Airlines. Plus, when you join Expedia's free One Key™ program, you can receive OneKeyCash™* alongside any airline loyalty program earnings. It's yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
Changes are generally free within 24 hours of making your booking, but your airline may charge a fee after that. For more information about modifying your reservation, check out your "Trips," select your flight and click on "Manage Booking." If you'd like the freedom to make changes without additional costs, check the "Changes included" or "No cancel fee" filter when planning your next break.

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