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?

As of December 2025, there is 1 operator available to choose from 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.

$252 Cheap Flights from St. Louis to Casper in 2025/26

1 adult

0 bags

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Find the cheapest flights from St. Louis to Casper

Round-trip

One-way

Cheap round-trip flights

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9:00 am - 2:40 pm

STL

CPR

6h 40m1 stop

3:19 pm - 10:22 pm

CPR

STL

6h 03m1 stop

$310United Airlines

Thu, Jan 1 - Mon, Jan 5

6:00 pm - 10:14 pm

STL

CPR

5h 14m1 stop

3:17 pm - 8:58 pm

CPR

STL

4h 41m1 stop

$328United Airlines

Wed, Jan 14 - Sat, Jan 17

6:00 pm - 10:14 pm

STL

CPR

5h 14m1 stop

11:28 am - 11:59 pm

CPR

STL

11h 31m2 stops

$334United Airlines

Wed, Jan 14 - Sat, Jan 17

9:00 am - 2:40 pm

STL

CPR

6h 40m1 stop

6:10 pm - 12:37 pm

CPR

STL

17h 27m2 stops

$344United Airlines

Thu, Jan 1 - Mon, Jan 5

8:05 am - 7:01 pm

STL

CPR

11h 56m2 stops

6:10 pm - 12:37 pm

CPR

STL

17h 27m2 stops

$349United Airlines

Thu, Jan 1 - Mon, Jan 5

11:22 am - 10:14 pm

STL

CPR

11h 52m2 stops

5:30 am - 5:43 pm

CPR

STL

11h 13m2 stops

$374United Airlines

Wed, Jan 14 - Sat, Jan 17

6:00 pm - 10:14 pm

STL

CPR

5h 14m1 stop

11:28 am - 1:16 pm

CPR

STL

24h 48m1 stop

$387United Airlines

Wed, Jan 14 - Fri, Jan 16

11:20 am - 7:06 pm

STL

CPR

8h 46m2 stops

9:00 am - 4:55 pm

CPR

STL

6h 55m1 stop

$492United Airlines

Wed, Jan 14 - Fri, Jan 16

11:20 am - 7:06 pm

STL

CPR

8h 46m2 stops

1:16 pm - 10:58 pm

CPR

STL

8h 42m2 stops

$497United Airlines

Wed, Jan 14 - Fri, Jan 16

1:05 pm - 10:25 pm

STL

CPR

10h 20m2 stops

1:22 pm - 10:22 pm

CPR

STL

8h 00m1 stop

$610United Airlines

Wed, Dec 31 - Sun, Jan 4

United Airlines flights from St. Louis to Casper

Our best United Airlines deals on St. Louis to Casper flight tickets

United Airlines

Jan 1

STL9:00 amLambert-St Louis

6h 40m

1 stop

CPR2:40 pmCasper Natrona County

Jan 5

CPR3:19 pmCasper Natrona County

6h 03m

1 stop

STL10:22 pmLambert-St Louis

$310

Find similar

United Airlines

Jan 14

STL6:00 pmLambert-St Louis

5h 14m

1 stop

CPR10:14 pmCasper Natrona County

Jan 17

CPR3:17 pmCasper Natrona County

4h 41m

1 stop

STL8:58 pmLambert-St Louis

$328

Find similar

United Airlines

Jan 14

STL6:00 pmLambert-St Louis

5h 14m

1 stop

CPR10:14 pmCasper Natrona County

Jan 17

CPR6:04 pmCasper Natrona County

15h 37m

2 stops

STL10:41 amLambert-St Louis

$334

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Thu 1/1

9:00 am-2:40 pm

1 stop6h 40m

Casper Natrona County

Mon 1/5

3:19 pm-10:22 pm

1 stop6h 03m

$310

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

6:00 pm-10:14 pm

1 stop5h 14m

Casper Natrona County

Sat 1/17

3:17 pm-8:58 pm

1 stop4h 41m

$328

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

6:00 pm-10:14 pm

1 stop5h 14m

Casper Natrona County

Sat 1/17

11:28 am-11:59 pm

2 stops11h 31m

$334

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Thu 1/1

9:00 am-2:40 pm

1 stop6h 40m

Casper Natrona County

Mon 1/5

6:10 pm-12:37 pm

2 stops17h 27m

$344

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Thu 1/1

8:05 am-7:01 pm

2 stops11h 56m

Casper Natrona County

Mon 1/5

6:10 pm-12:37 pm

2 stops17h 27m

$349

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

11:22 am-10:14 pm

2 stops11h 52m

Casper Natrona County

Sat 1/17

5:30 am-5:43 pm

2 stops11h 13m

$374

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

6:00 pm-10:14 pm

1 stop5h 14m

Casper Natrona County

Fri 1/16

11:28 am-1:16 pm

1 stop24h 48m

$387

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

11:20 am-7:06 pm

2 stops8h 46m

Casper Natrona County

Fri 1/16

9:00 am-4:55 pm

1 stop6h 55m

$492

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 1/14

11:20 am-7:06 pm

2 stops8h 46m

Casper Natrona County

Fri 1/16

1:16 pm-10:58 pm

2 stops8h 42m

$497

St. LouisCasper

STL - CPR

STLCPR

Lambert-St Louis

Wed 12/31

1:05 pm-10:25 pm

2 stops10h 20m

Casper Natrona County

Sun 1/4

1:22 pm-10:22 pm

1 stop8h 00m

$610

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Casper

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Casper?

The cheapest day to depart from St. Louis to Casper is on a Saturday when prices can be found for as low as $333. The most expensive day to fly to Casper is Tuesday, with ticket prices averaging around $1,086.

What is the cheapest time of day to depart on your flight to Casper?

The cheapest time of day to fly to Casper is at noon when flights can be purchased for as low as $353. Flights to Casper are more costly in the afternoon, with an average ticket price of $435. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

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	6h 40m
Direct flights	None

The fastest flight from St. Louis to Casper takes 6h 40m

There are no direct flights from St. Louis to Casper. There are no popular flight routes from St. Louis to Casper.

Search flight deals

How far is Lambert-St Louis to Casper Natrona County by plane?
Casper Natrona County is 891.0 mi away from Lambert-St Louis. 6h 40m 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?
As of December 2025, there is 1 operator available to choose from 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?
momondo data reveals that the most frequently booked airline on the route from St. Louis to Casper is United Airlines, representing 100% of all bookings.

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 Airlines	PriceFrom $238	Free Cancellation	Rating 7.4 9,091 reviews		Search United Airlines flights

Rawlins

Evansville

Douglas

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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.

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