$73 Cheap Flights from St. Louis (STL) to Las Vegas (LAS)

View $73 flight on Tue, Oct 21, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)

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Cheap Flights from St. Louis to Las Vegas (STL-LAS)

Prices were available within the past 7 days and start at $73 for one-way flights and $145 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Oct 21 - Wed, Nov 5
STL
St. Louis
LAS
Las Vegas
$145 Roundtrip, just found
$145
Roundtrip
just found
Select American Airlines flight, departing Tue, Oct 21 from St. Louis to Las Vegas, returning Wed, Nov 5, priced at $145 just found
Spirit Airlines
Mon, Sep 8 - Sun, Sep 14
STL
St. Louis
LAS
Las Vegas
$157 Roundtrip, found 9 hours ago
$157
Roundtrip
found 9 hours ago
Select Spirit Airlines flight, departing Mon, Sep 8 from St. Louis to Las Vegas, returning Sun, Sep 14, priced at $157 found 9 hours ago
American Airlines
Mon, Aug 18 - Thu, Aug 21
STL
St. Louis
LAS
Las Vegas
$163 Roundtrip, found 3 hours ago
$163
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Mon, Aug 18 from St. Louis to Las Vegas, returning Thu, Aug 21, priced at $163 found 3 hours ago
Spirit Airlines
Thu, Sep 11 - Sat, Sep 13
STL
St. Louis
LAS
Las Vegas
$165 Roundtrip, found 1 hour ago
$165
Roundtrip
found 1 hour ago
Select Spirit Airlines flight, departing Thu, Sep 11 from St. Louis to Las Vegas, returning Sat, Sep 13, priced at $165 found 1 hour ago
Spirit Airlines
Thu, Sep 25 - Sun, Sep 28
STL
St. Louis
LAS
Las Vegas
$167 Roundtrip, found 1 hour ago
$167
Roundtrip
found 1 hour ago
Select Spirit Airlines flight, departing Thu, Sep 25 from St. Louis to Las Vegas, returning Sun, Sep 28, priced at $167 found 1 hour ago
Spirit Airlines
Mon, Aug 18 - Thu, Aug 21
STL
St. Louis
LAS
Las Vegas
$173 Roundtrip, found 3 hours ago
$173
Roundtrip
found 3 hours ago
Select Spirit Airlines flight, departing Mon, Aug 18 from St. Louis to Las Vegas, returning Thu, Aug 21, priced at $173 found 3 hours ago
Spirit Airlines
Fri, Sep 26 - Fri, Oct 3
STL
St. Louis
LAS
Las Vegas
$175 Roundtrip, just found
$175
Roundtrip
just found
Select Spirit Airlines flight, departing Fri, Sep 26 from St. Louis to Las Vegas, returning Fri, Oct 3, priced at $175 just found
Frontier Airlines
Mon, Aug 11 - Fri, Aug 15
STL
St. Louis
LAS
Las Vegas
$198 Roundtrip, found 4 hours ago
$198
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Mon, Aug 11 from St. Louis to Las Vegas, returning Fri, Aug 15, priced at $198 found 4 hours ago
Southwest Airlines
Thu, Aug 14 - Mon, Aug 18
STL
St. Louis
LAS
Las Vegas
$202 Roundtrip, just found
$202
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Aug 14 from St. Louis to Las Vegas, returning Mon, Aug 18, priced at $202 just found
Sun Country Airlines
Sun, Sep 21 - Wed, Sep 24
STL
St. Louis
LAS
Las Vegas
$204 Roundtrip, found 2 hours ago
$204
Roundtrip
found 2 hours ago
Select Sun Country Airlines flight, departing Sun, Sep 21 from St. Louis to Las Vegas, returning Wed, Sep 24, priced at $204 found 2 hours ago

Alternative airports near Las Vegas

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to McCarran Intl. LAS. Cheapest and Closest option available. Average driving time to city center is 6 minutes. Flights from $362
LAS
McCarran Intl.
CheapestClosest
Average driving time to city center6 min
Flights from $362
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
Roundtrip price
$144
Distance
1368 mi
Average flight time
1 hour 35 mins

St. Louis to Las Vegas Flights

The cheapest times to fly from St. Louis to Las Vegas

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Las Vegas are during the month of October. You can find some of the cheapest flights from St. Louis to Las Vegas with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Las Vegas

Sunday is one of the best days to book for cheap flights from St. Louis to Las Vegas: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Las Vegas

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Las Vegas in 2025. You can also book with separate airlines for your outbound and return journeys, from $73 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Las Vegas flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Las Vegas airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS) cost?
You can land affordable return tickets from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS) starting at $213. Reserve your seat and get ready to go. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving STL on July 13 2025 and touching down at LAS. The price was last updated on June 16 2025 and has not changed since.
What is the cheapest month to fly from STL to LAS?
The cheapest flights from STL to LAS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
Board a nonstop flight with Southwest Airlines and fly straight from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS).
What is the cheapest airline that flies from STL to LAS?
With prices starting from $114 for a one-way flight from STL to LAS, Frontier Airlines is currently the cheapest carrier flying this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STL on August 14 2025. Prices were last updated on June 16 2025 and have not changed since.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
Daily, an average of 5 direct flights operate from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS). Choose the departure date that best fits your schedule.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
More travelers fly between STL and LAS at 5 PM than at any other time of day. Rather skip the crowds? Travel outside of rush hours and there’s a chance you’ll save on your fare as well.
What day of the week has the most flights from STL to LAS?
Travel on a Friday if you’re searching for the biggest selection of flights from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
Lambert-St. Louis Intl. Airport (STL)’s earliest flight to Harry Reid Intl. Airport (LAS) leaves at approximately 6:20AM UTC-6. With a flight time of 3h 50m, you’ll land at around 8:10AM UTC-8.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
The average flight time from STL to LAS is 3 hours and 49 minutes, covering a distance of 1,350 mi.
What airline has the least delays from STL to LAS?
With 90% of flights generally landing on schedule, Southwest Airlines has the best on-time performance for nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS). To monitor your flight status and receive notifications if anything changes, simply head to the Expedia App.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
Select a flight from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Later departures are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Las Vegas from Lambert-St. Louis Intl. Airport (STL)?
Compare your flight options from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS). This is the only Las Vegas airport you can jet into if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS) last-minute?
Booking your ticket from STL to LAS just before your getaway is generally more expensive. But if there’s some wiggle room with your departure times and dates, you could snag a cheap last-minute fare.
Is it cheaper to book a STL to LAS flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to LAS flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one easy place will take the stress out of travel planning. Simply secure your flights and choose from our wide range of hotels, then personalize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS)?
If you reserved your STL to LAS flight within the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for further details.

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