$316 Cheap Flights from St. Louis (STL) to Casper (CPR)

View $316 flight on Sun, Oct 19, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Casper, WY (CPR-Natrona County Intl.)

Cheap Flights from St. Louis to Casper (STL-CPR)

Prices were available within the past 7 days and start at $316 for one-way flights and $238 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Oct 31 - Tue, Nov 4
STL
St. Louis
CPR
Casper
$238 Roundtrip, found 3 days ago
$238
Roundtrip
found 3 days ago
Select United flight, departing Fri, Oct 31 from St. Louis to Casper, returning Tue, Nov 4, priced at $238 found 3 days ago
United
Fri, Oct 24 - Tue, Oct 28
STL
St. Louis
CPR
Casper
$248 Roundtrip, found 2 days ago
$248
Roundtrip
found 2 days ago
Select United flight, departing Fri, Oct 24 from St. Louis to Casper, returning Tue, Oct 28, priced at $248 found 2 days ago
United
Fri, Oct 31 - Tue, Nov 4
STL
St. Louis
CPR
Casper
$254 Roundtrip, found 3 days ago
$254
Roundtrip
found 3 days ago
Select United flight, departing Fri, Oct 31 from St. Louis to Casper, returning Tue, Nov 4, priced at $254 found 3 days ago
United
Thu, Feb 5 - Sun, Feb 8
STL
St. Louis
CPR
Casper
$262 Roundtrip, found 3 days ago
$262
Roundtrip
found 3 days ago
Select United flight, departing Thu, Feb 5 from St. Louis to Casper, returning Sun, Feb 8, priced at $262 found 3 days ago
United
Fri, Oct 24 - Tue, Oct 28
STL
St. Louis
CPR
Casper
$263 Roundtrip, found 2 days ago
$263
Roundtrip
found 2 days ago
Select United flight, departing Fri, Oct 24 from St. Louis to Casper, returning Tue, Oct 28, priced at $263 found 2 days ago
United
Fri, Oct 31 - Tue, Nov 4
STL
St. Louis
CPR
Casper
$274 Roundtrip, found 3 days ago
$274
Roundtrip
found 3 days ago
Select United flight, departing Fri, Oct 31 from St. Louis to Casper, returning Tue, Nov 4, priced at $274 found 3 days ago
United
Thu, Feb 5 - Sun, Feb 8
STL
St. Louis
CPR
Casper
$293 Roundtrip, found 3 days ago
$293
Roundtrip
found 3 days ago
Select United flight, departing Thu, Feb 5 from St. Louis to Casper, returning Sun, Feb 8, priced at $293 found 3 days ago
United
Thu, Jan 15 - Thu, Jan 22
STL
St. Louis
CPR
Casper
$295 Roundtrip, found 7 hours ago
$295
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Jan 15 from St. Louis to Casper, returning Thu, Jan 22, priced at $295 found 7 hours ago
United
Tue, Oct 14 - Sat, Oct 18
STL
St. Louis
CPR
Casper
$298 Roundtrip, found 4 days ago
$298
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 14 from St. Louis to Casper, returning Sat, Oct 18, priced at $298 found 4 days ago
United
Fri, Oct 24 - Tue, Oct 28
STL
St. Louis
CPR
Casper
$300 Roundtrip, found 2 days ago
$300
Roundtrip
found 2 days ago
Select United flight, departing Fri, Oct 24 from St. Louis to Casper, returning Tue, Oct 28, priced at $300 found 2 days ago

Alternative airports near Casper

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

Select flight to Natrona County Intl. CPR. Cheapest and Closest option available. Average driving time to city center is 12 minutes. Flights from $313
CPR
Natrona County Intl.
CheapestClosest
Average driving time to city center12 min
Flights from $313

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR) cost?
Grab a cheap one-way flight from $316 or cheap return flight from $238 from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR)?
Planning your trip for October is a good way to save, as it's the cheapest month for flights between STL and CPR. You'll usually find the lowest fares during off-peak months.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR)?
To find the cheapest airline flying from STL to CPR, use Expedia's filter tool. Tailor your search based on your travel needs, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR)?
You'll have to catch a flight with a layover when traveling from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from STL to CPR?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on a range of factors, such as 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 Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR)?
To land at Natrona County Intl. Airport (CPR) on schedule, opt for a flight that leaves Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR) last-minute?
Waiting until just before your departure to book a ticket from STL to CPR often results in higher prices. While you might find some last-minute discounts, there's no guarantee. Keep your travel plans flexible for a better chance of landing a bargain.
Is it cheaper to book a STL to CPR flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to CPR flight and hotel package with Expedia could result in significant savings. Better yet, managing everything in one place will take the hassle out of planning your trip. Simply pick your flights and choose from our wide range of hotels, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Natrona County Intl. Airport (CPR)?
Typically, you can modify or cancel your STL to CPR flight. However, additional fees may apply, especially if you booked more than 24 hours ago. Check your itinerary for the airline's rules and fees on flight changes, or if you need more details, go to our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Natrona County Intl.
Airlines serving
United
Roundtrip price
$238
Distance
887 mi

Book with confidence

St. Louis to Casper Flights

The cheapest times to fly from St. Louis to Casper

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

 

The best time to book a flight from St. Louis to Casper

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

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 Casper in 2025. You can also book with separate airlines for your outbound and return journeys, from $316 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 Casper 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 Casper 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.

 

St. Louis to Casper Flights

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*Available to One Key members.