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

Popular airlines from Harry Reid Intl. Airport (LAS) to St. Louis, MO (CPS-St. Louis Downtown)

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $274
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $274
Flights from Las Vegas (LAS) to St. Louis (CPS)
Origin airport
Harry Reid Intl.
Destination airport
St. Louis Downtown
Distance
1379 mi

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 . 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 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 St. Louis Downtown Airport (CPS) cost?
Secure a cheap one-way flight or cheap return flight from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS)?
The cheapest month to fly from LAS to CPS is , when demand is low. Off-peak season is typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll take you from LAS to CPS. Then, sort your results by "Price (lowest to highest)" to snag a good deal.
How many flights per day from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS)?
You'll have to hop on a flight with a layover if you're traveling from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from LAS to CPS?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary based on various factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS)?
Book a flight from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS) that takes off before 3 PM to reduce the risk of cancellations. Departures later than this have a 22% higher chance of being canceled, on average.**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 East St. Louis from Harry Reid Intl. Airport (LAS)?
Browse your flight options from Harry Reid Intl. Airport (LAS) to Lambert-St. Louis Intl. Airport (STL). This is the only airport in East St. Louis you can fly into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS) last-minute?
Holding off until right before your break to book a flight from LAS to CPS often results in higher prices. While you might find some last-minute offers, they aren't always guaranteed. Keep your travel plans flexible to maximize your chances of getting a bargain.
Is it cheaper to book a LAS to CPS flight and hotel package?
Booking a LAS to CPS flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Choose from our impressive range of hotels and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Harry Reid Intl. Airport (LAS) to St. Louis Downtown Airport (CPS)?
If you booked your LAS to CPS flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare 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, head to our Customer Service portal for further details.

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*Available to One Key members.