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

Prices for flights from Casper Natrona County Airport to Lambert-St Louis Airport are updated daily.

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

As of November 2025, there is 1 operator available to choose from for flights from Casper Natrona County Airport to Lambert-St Louis Airport.

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

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$238 Cheap Flights from Casper to St. Louis in 2025/26

1 adult

0 bags

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Find the cheapest flights from Casper to St. Louis

Round-trip

One-way

Cheap round-trip flights

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9:03 am - 4:28 pmCPR-STL

6h 25m1 stop

4:37 pm - 10:15 pmSTL-CPR

6h 38m1 stop

$238United Airlines

Find Deal

Wed, Dec 3 - Mon, Dec 8

9:03 am - 4:28 pmCPR-STL

6h 25m1 stop

3:19 pm - 10:15 pmSTL-CPR

7h 56m2 stops

$304United Airlines

Find Deal

Wed, Dec 3 - Mon, Dec 8

5:58 pm - 10:50 amCPR-STL

15h 52m2 stops

8:30 am - 10:15 pmSTL-CPR

14h 45m2 stops

$319United Airlines

Find Deal

Wed, Dec 3 - Mon, Dec 8

United Airlines flights from Casper to St. Louis

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

United Airlines

Dec 3

CPR9:03 amCasper Natrona County

6h 25m

1 stop

STL4:28 pmLambert-St Louis

Dec 8

STL4:37 pmLambert-St Louis

6h 38m

1 stop

CPR10:15 pmCasper Natrona County

$238

Find similar

United Airlines

Dec 3

CPR9:03 amCasper Natrona County

6h 25m

1 stop

STL4:28 pmLambert-St Louis

Dec 8

STL3:19 pmLambert-St Louis

7h 56m

2 stops

CPR10:15 pmCasper Natrona County

$304

Find similar

United Airlines

Dec 3

CPR5:58 pmCasper Natrona County

15h 52m

2 stops

STL10:50 amLambert-St Louis

Dec 8

STL8:30 amLambert-St Louis

14h 45m

2 stops

CPR10:15 pmCasper Natrona County

$319

Find similar

Fly from

Fly to

Route

Depart

Return

Price

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 12/3

9:03 am-4:28 pm

1 stop6h 25m

Lambert-St Louis

Mon 12/8

4:37 pm-10:15 pm

1 stop6h 38m

$238

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 12/3

9:03 am-4:28 pm

1 stop6h 25m

Lambert-St Louis

Mon 12/8

3:19 pm-10:15 pm

2 stops7h 56m

$304

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Wed 12/3

5:58 pm-10:50 am

2 stops15h 52m

Lambert-St Louis

Mon 12/8

8:30 am-10:15 pm

2 stops14h 45m

$319

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

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 St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $378. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $668. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Casper at noon is the least expensive time of day to depart. momondo users have found prices as low as $400 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $581 per ticket.

When to book flights from Casper to St. Louis

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

Estimated round-trip price

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

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

Direct flights	None

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

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How far is Casper Natrona County to Lambert-St Louis by plane?
There are 891.0 mi between Casper Natrona County and Lambert-St Louis. 6h 25m is a normal flight duration for this route.
When did momondo last update prices for flights from Casper Natrona County Airport to Lambert-St Louis Airport?
Prices for flights from Casper Natrona County Airport to Lambert-St Louis Airport are updated daily.
How many operators does momondo search for flights from Casper Natrona County Airport to Lambert-St Louis Airport?
As of November 2025, there is 1 operator available to choose from for flights from Casper Natrona County Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Casper Natrona County Airport to Lambert-St Louis 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 Casper Natrona County Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Casper to St. Louis?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Casper to St. Louis is United Airlines (100% of total bookings).

Best airlines flying from Casper to St. Louis

Compare and see reviews for airlines that fly from Casper to St. Louis with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $301	Free Cancellation	Rating 7.4 9,002 reviews		Search United Airlines flights

St. Charles

Chesterfield

Hermann

Fairview Heights

Florissant

Maryland Heights

O'Fallon

Wentzville

Fenton

Collinsville

St. Peters

Alton

Farmington

Festus

Glencoe

Edwardsville

Clayton

Eureka

Litchfield

Shrewsbury

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

All flight searches from Casper to St. Louis on momondo can be filtered to show those which offer flexible booking policies.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Casper and alert you when they change.