$83 Cheap Flights from Las Vegas (LAS) to St. Louis (STL)

View $83 flight on Fri, Jul 18, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

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

Prices were available within the past 7 days and start at $83 for one-way flights and $182 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Wed, Jul 16 - Sat, Jul 19
LAS
Las Vegas
STL
St. Louis
$182 Roundtrip, found 1 day ago
$182
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Wed, Jul 16 from Las Vegas to St. Louis, returning Sat, Jul 19, priced at $182 found 1 day ago
Spirit Airlines
Sat, Aug 23 - Mon, Aug 25
LAS
Las Vegas
STL
St. Louis
$184 Roundtrip, found 2 days ago
$184
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Sat, Aug 23 from Las Vegas to St. Louis, returning Mon, Aug 25, priced at $184 found 2 days ago
Frontier Airlines
Thu, Aug 28 - Thu, Sep 4
LAS
Las Vegas
STL
St. Louis
$185 Roundtrip, found 2 days ago
$185
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Aug 28 from Las Vegas to St. Louis, returning Thu, Sep 4, priced at $185 found 2 days ago
Frontier Airlines
Thu, Sep 18 - Sat, Sep 20
LAS
Las Vegas
STL
St. Louis
$188 Roundtrip, found 17 hours ago
$188
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Thu, Sep 18 from Las Vegas to St. Louis, returning Sat, Sep 20, priced at $188 found 17 hours ago
Frontier Airlines
Thu, Aug 28 - Tue, Sep 2
LAS
Las Vegas
STL
St. Louis
$192 Roundtrip, found 1 day ago
$192
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Aug 28 from Las Vegas to St. Louis, returning Tue, Sep 2, priced at $192 found 1 day ago
Frontier Airlines
Thu, Sep 18 - Sun, Sep 21
LAS
Las Vegas
STL
St. Louis
$193 Roundtrip, found 2 days ago
$193
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Sep 18 from Las Vegas to St. Louis, returning Sun, Sep 21, priced at $193 found 2 days ago
Spirit Airlines
Fri, Jul 18 - Sat, Jul 26
LAS
Las Vegas
STL
St. Louis
$194 Roundtrip, found 9 hours ago
$194
Roundtrip
found 9 hours ago
Select Spirit Airlines flight, departing Fri, Jul 18 from Las Vegas to St. Louis, returning Sat, Jul 26, priced at $194 found 9 hours ago
Southwest Airlines
Thu, Sep 18 - Sun, Sep 21
LAS
Las Vegas
STL
St. Louis
$196 Roundtrip, found 2 days ago
$196
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, Sep 18 from Las Vegas to St. Louis, returning Sun, Sep 21, priced at $196 found 2 days ago
American Airlines
Wed, Aug 20 - Mon, Aug 25
LAS
Las Vegas
STL
St. Louis
$201 Roundtrip, found 5 hours ago
$201
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Wed, Aug 20 from Las Vegas to St. Louis, returning Mon, Aug 25, priced at $201 found 5 hours ago
Alaska Airlines
Thu, Sep 18 - Mon, Sep 22
LAS
Las Vegas
STL
St. Louis
$206 Roundtrip, found 21 hours ago
$206
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Thu, Sep 18 from Las Vegas to St. Louis, returning Mon, Sep 22, priced at $206 found 21 hours ago

Find the cheapest month to fly from Las Vegas (LAS) to St. Louis (STL)

August is typically the cheapest month to fly

From $70 - $270 per traveler.

Graph displaying average flight prices per month

Flights from Las Vegas (LAS) to St. Louis (STL)
Origin airport
Harry Reid Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$182
Distance
1368 mi
Average flight time
5 hours 22 mins

Las Vegas to St. Louis Flights

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

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 Las Vegas to St. Louis are during the month of July. You can find some of the cheapest flights from Las Vegas to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Las Vegas to St. Louis: 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 Las Vegas to St. Louis

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 Las Vegas to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $83 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 Las Vegas to St. Louis 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 Las Vegas to St. Louis 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 Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL) cost?
Score cheap return tickets from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL) starting from $167. Book your seat and start your adventure. 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 LAS on July 25 2025 and touching down at STL. The price was last updated on June 30 2025 and has not changed since.
What is the cheapest month to fly from LAS to STL?
Search for direct flights from LAS to STL in December to score cheaper tickets. You can find a one-way Southwest Airlines flight for $99 leaving on December 11 2025. This price is based on the cheapest direct flight found on Expedia for this route in the next 330 days. The price was last updated on June 30 2025 and remains unchanged.
Which airlines fly direct from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL)?
When departing from Harry Reid Intl. Airport (LAS), you can get on a direct flight to Lambert-St. Louis Intl. Airport (STL) with Southwest Airlines.
What is the cheapest airline that flies from LAS to STL?
With prices starting from $99 for a one-way journey from LAS to STL, Southwest Airlines is currently the cheapest carrier for this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from LAS on September 25 2025. Prices were last updated on June 30 2025 and have not changed since.
How many flights per day from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL)?
With, on average, 5 nonstop flights departing from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL) daily, you'll be off on your next adventure in no time.
What are the most popular departure times for flights from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL)?
More travelers fly between LAS and STL at 6 PM than at any other point in the day. Looking for a quieter experience? Consider flying outside peak hours and it's possible you'll save on your fare as well.
What day of the week has the most flights from LAS to STL?
If you fly on a Sunday, you'll get the largest range of choices for flights from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL).
What is the earliest flight from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL)?
The first flight of the day departing from Harry Reid Intl. Airport (LAS) is at around 5:30AM UTC-8. Board this flight and you'll reach Lambert-St. Louis Intl. Airport (STL) at approximately 10:30AM UTC-6. The entire trip takes 3h.
How long does it take to fly from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL)?
The average flight time from LAS to STL is 3 hours and 8 minutes, covering a total distance of 1,350 mi.
What airline has the least delays from LAS to STL?
With 80% of journeys generally arriving on schedule, Spirit Airlines has the best on-time performance for direct flights from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL). To keep track of your flight status and get notifications about any changes, simply head to the Expedia App.
What is the best time to fly from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL)?
To land at Lambert-St. Louis Intl. Airport (STL) on schedule, pick a flight that leaves from Harry Reid Intl. Airport (LAS) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 St. Louis from Harry Reid Intl. Airport (LAS)?
If you're taking a direct flight from Harry Reid Intl. Airport (LAS) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your ticket from LAS to STL right before your journey is typically more expensive. However, if you're flexible with your itinerary, you could land a cheap last-minute fare.
Is it cheaper to book a LAS to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a LAS to STL flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place will take the hassle out of planning your trip. Simply pick your flights and choose from our wide range of stays, then customize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL)?
If you reserved your LAS to STL flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more details.

Explore a world of travel with Expedia

*Available to One Key members.