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Cheap flights from St. Louis to Casper from $308

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Casper departing on 9/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Casper

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
1:36 pm - 7:09 pmSTL  Lambert-St Louis-CPR Casper Natrona County
6h 33m1 stop Denver Intl
United Airlines Logo
6:00 pm - 11:31 pmCPR  Casper Natrona County-STL Lambert-St Louis
4h 31m1 stop Denver Intl
$308United Airlines
Sun, Sep 6 - Sun, Sep 13
United Airlines Logo
6:00 am - 12:45 pmSTL  Lambert-St Louis-CPR Casper Natrona County
7h 45m2 stops Chicago O'Hare Intl Denver Intl
United Airlines Logo
6:00 pm - 11:31 pmCPR  Casper Natrona County-STL Lambert-St Louis
4h 31m1 stop Denver Intl
$314United Airlines
Sun, Sep 6 - Sun, Sep 13
United Airlines Logo
1:36 pm - 5:18 pmSTL  Lambert-St Louis-CPR Casper Natrona County
4h 42m1 stop Denver Intl
United Airlines Logo
4:28 pm - 11:40 pmCPR  Casper Natrona County-STL Lambert-St Louis
6h 12m1 stop Denver Intl
$323United Airlines
Sat, Aug 22 - Fri, Aug 28
United Airlines Logo
8:00 am - 2:46 pmSTL  Lambert-St Louis-CPR Casper Natrona County
7h 46m2 stops Chicago O'Hare Intl Denver Intl
United Airlines Logo
6:05 pm - 11:40 pmCPR  Casper Natrona County-STL Lambert-St Louis
4h 35m1 stop Denver Intl
$329United Airlines
Sat, Aug 22 - Fri, Aug 28
United Airlines Logo
4:30 pm - 10:12 pmSTL  Lambert-St Louis-CPR Casper Natrona County
6h 42m1 stop Denver Intl
United Airlines Logo
9:10 am - 4:26 pmCPR  Casper Natrona County-STL Lambert-St Louis
6h 16m1 stop Denver Intl
$388United Airlines
Sat, Jan 30 - Wed, Feb 3
United Airlines Logo
1:40 pm - 6:53 pmSTL  Lambert-St Louis-CPR Casper Natrona County
6h 13m1 stop Denver Intl
United Airlines Logo
8:55 am - 4:57 pmCPR  Casper Natrona County-STL Lambert-St Louis
7h 02m1 stop Denver Intl
$388United Airlines
Sat, Oct 31 - Wed, Nov 4
United Airlines Logo
8:30 am - 5:17 pmSTL  Lambert-St Louis-CPR Casper Natrona County
9h 47m2 stops Washington, D.C. Dulles Intl Denver Intl
United Airlines Logo
3:13 pm - 8:59 pmCPR  Casper Natrona County-STL Lambert-St Louis
4h 46m1 stop Denver Intl
$394United Airlines
Sat, Oct 31 - Wed, Nov 4

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United Airlines flights from St. Louis to Casper

Our best United Airlines deals on St. Louis to Casper flight tickets
United Airlines
Sep 6
STL1:36 pmLambert-St Louis
6h 33m
1 stop
CPR7:09 pmCasper Natrona County
Sep 13
CPR6:00 pmCasper Natrona County
4h 31m
1 stop
STL11:31 pmLambert-St Louis
$308
United Airlines
Sep 6
STL6:00 amLambert-St Louis
7h 45m
2 stops
CPR12:45 pmCasper Natrona County
Sep 13
CPR6:00 pmCasper Natrona County
4h 31m
1 stop
STL11:31 pmLambert-St Louis
$314
United Airlines
Aug 22
STL1:36 pmLambert-St Louis
4h 42m
1 stop
CPR5:18 pmCasper Natrona County
Aug 28
CPR4:28 pmCasper Natrona County
6h 12m
1 stop
STL11:40 pmLambert-St Louis
$323

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Casper that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 8, 2026.
Use the filters below to find and compare flights from St. Louis to Casper that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisCasper

STL Lambert-St Louis - CPR Casper Natrona County

STLCPR

Lambert-St Louis

Sun 9/6

1:36 pm-7:09 pm

1 stop6h 33m

Casper Natrona County

Sun 9/13

6:00 pm-11:31 pm

1 stop4h 31m

$308

St. LouisCasper

STL Lambert-St Louis - CPR Casper Natrona County

STLCPR

Lambert-St Louis

Sun 9/6

6:00 am-12:45 pm

2 stops7h 45m

Casper Natrona County

Sun 9/13

6:00 pm-11:31 pm

1 stop4h 31m

$314
Quickest round-trip

St. LouisCasper

STL Lambert-St Louis - CPR Casper Natrona County

STLCPR

Lambert-St Louis

Sat 8/22

1:36 pm-5:18 pm

1 stop4h 42m

Casper Natrona County

Fri 8/28

4:28 pm-11:40 pm

1 stop6h 12m

$323

St. LouisCasper

STL Lambert-St Louis - CPR Casper Natrona County

STLCPR

Lambert-St Louis

Sat 8/22

8:00 am-2:46 pm

2 stops7h 46m

Casper Natrona County

Fri 8/28

6:05 pm-11:40 pm

1 stop4h 35m

$329

St. LouisCasper

STL Lambert-St Louis - CPR Casper Natrona County

STLCPR

Lambert-St Louis

Sat 1/30

4:30 pm-10:12 pm

1 stop6h 42m

Casper Natrona County

Wed 2/3

9:10 am-4:26 pm

1 stop6h 16m

$388

St. LouisCasper

STL Lambert-St Louis - CPR Casper Natrona County

STLCPR

Lambert-St Louis

Sat 10/31

1:40 pm-6:53 pm

1 stop6h 13m

Casper Natrona County

Wed 11/4

8:55 am-4:57 pm

1 stop7h 02m

$388

St. LouisCasper

STL Lambert-St Louis - CPR Casper Natrona County

STLCPR

Lambert-St Louis

Sat 10/31

8:30 am-5:17 pm

2 stops9h 47m

Casper Natrona County

Wed 11/4

3:13 pm-8:59 pm

1 stop4h 46m

$394

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from St. Louis to Casper

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Casper according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Casper (STL to CPR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Casper

Fastest flight time

4h 42m

Direct flights

None
The fastest flight from St. Louis to Casper takes 4h 42m
There are no direct flights from St. Louis to Casper. There are no popular flight routes from St. Louis to Casper.
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Frequently asked questions about flying from St. Louis to Casper

  • How far is Lambert-St Louis to Casper Natrona County by plane?

    Casper Natrona County is 891.0 mi away from Lambert-St Louis. 4h 42m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Casper Natrona County Airport?

    Prices for flights from Lambert-St Louis Airport to Casper Natrona County Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Casper Natrona County Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Casper Natrona County Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Casper Natrona County Airport.

  • What documentation or ID do you need to fly to Casper Natrona County Airport?

    The travel and health documents required for your trip to Casper Natrona County Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Casper Natrona County Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Casper?

Best airlines flying from St. Louis to Casper

Compare and see reviews for airlines that fly from St. Louis to Casper with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $238Free CancellationRating
7.4
10,086 reviews
Search United Airlines flights

Frequently asked questions about flying from St. Louis to Casper

  • How do I get Price Alerts for flights from St. Louis to Casper?

    Confirm your travel details to search for the latest offers for flights from St. Louis to Casper. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from St. Louis to Casper with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near Casper?

Book flights to Casper if you plan to visit one of these locations
Rawlins
Douglas
Evansville

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Casper?

Finding the right flight to Casper from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Casper quick and easy, saving you time and money.

Can I find flights from St. Louis to Casper with flexible booking policies on momondo?

momondo does allow users to show only those flights to Casper from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Casper?

momondo helps you find the best flight between St. Louis and Casper by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from St. Louis to Casper right now. Can momondo alert me if prices change?

Price alerts on flights to Casper from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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