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 December 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.

$254 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

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One-way

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Cheap round-trip flights

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11:28 am - 8:58 pm

CPR

STL

8h 30m1 stop

8:45 am - 4:54 pm

STL

CPR

9h 09m1 stop

$328United Airlines

Sat, Jan 31 - Tue, Feb 3

3:17 pm - 8:58 pm

CPR

STL

4h 41m1 stop

8:05 am - 4:54 pm

STL

CPR

9h 49m2 stops

$334United Airlines

Sat, Jan 31 - Tue, Feb 3

7:00 am - 4:03 pm

CPR

STL

8h 03m2 stops

3:11 pm - 10:15 pm

STL

CPR

8h 04m2 stops

$339United Airlines

Sat, Jan 31 - Tue, Feb 3

7:00 am - 1:20 pm

CPR

STL

5h 20m1 stop

8:45 am - 4:54 pm

STL

CPR

9h 09m1 stop

$494United Airlines

Sat, Jan 3 - Wed, Jan 7

7:00 am - 1:20 pm

CPR

STL

5h 20m1 stop

6:30 am - 2:42 pm

STL

CPR

9h 12m2 stops

$499United Airlines

Sat, Jan 3 - Wed, Jan 7

11:26 am - 10:22 pm

CPR

STL

9h 56m1 stop

6:00 pm - 10:14 pm

STL

CPR

5h 14m1 stop

$527United Airlines

Sun, Jan 4 - Fri, Jan 16

1:22 pm - 10:22 pm

CPR

STL

8h 00m1 stop

6:30 am - 4:54 pm

STL

CPR

11h 24m2 stops

$563United Airlines

Sun, Jan 4 - Fri, Jan 16

11:00 am - 10:43 pm

CPR

STL

10h 43m2 stops

3:11 pm - 10:14 pm

STL

CPR

8h 03m2 stops

$604United Airlines

Sat, Jan 3 - Wed, Jan 7

5:30 am - 5:54 pm

CPR

STL

11h 24m2 stops

6:30 am - 4:54 pm

STL

CPR

11h 24m2 stops

$663United Airlines

Sun, Jan 4 - Fri, Jan 16

United Airlines flights from Casper to St. Louis

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

United Airlines

Jan 31

CPR11:28 amCasper Natrona County

8h 30m

1 stop

STL8:58 pmLambert-St Louis

Feb 3

STL8:45 amLambert-St Louis

9h 09m

1 stop

CPR4:54 pmCasper Natrona County

$328

Find similar

United Airlines

Jan 31

CPR3:17 pmCasper Natrona County

4h 41m

1 stop

STL8:58 pmLambert-St Louis

Feb 3

STL8:05 amLambert-St Louis

9h 49m

2 stops

CPR4:54 pmCasper Natrona County

$334

Find similar

United Airlines

Jan 31

CPR7:00 amCasper Natrona County

8h 03m

2 stops

STL4:03 pmLambert-St Louis

Feb 3

STL3:11 pmLambert-St Louis

8h 04m

2 stops

CPR10:15 pmCasper Natrona County

$339

Find similar

Fly from

Fly to

Route

Depart

Return

Price

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 1/31

11:28 am-8:58 pm

1 stop8h 30m

Lambert-St Louis

Tue 2/3

8:45 am-4:54 pm

1 stop9h 09m

$328

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 1/31

3:17 pm-8:58 pm

1 stop4h 41m

Lambert-St Louis

Tue 2/3

8:05 am-4:54 pm

2 stops9h 49m

$334

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 1/31

7:00 am-4:03 pm

2 stops8h 03m

Lambert-St Louis

Tue 2/3

3:11 pm-10:15 pm

2 stops8h 04m

$339

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 1/3

7:00 am-1:20 pm

1 stop5h 20m

Lambert-St Louis

Wed 1/7

8:45 am-4:54 pm

1 stop9h 09m

$494

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 1/3

7:00 am-1:20 pm

1 stop5h 20m

Lambert-St Louis

Wed 1/7

6:30 am-2:42 pm

2 stops9h 12m

$499

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sun 1/4

11:26 am-10:22 pm

1 stop9h 56m

Lambert-St Louis

Fri 1/16

6:00 pm-10:14 pm

1 stop5h 14m

$527

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sun 1/4

1:22 pm-10:22 pm

1 stop8h 00m

Lambert-St Louis

Fri 1/16

6:30 am-4:54 pm

2 stops11h 24m

$563

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sat 1/3

11:00 am-10:43 pm

2 stops10h 43m

Lambert-St Louis

Wed 1/7

3:11 pm-10:14 pm

2 stops8h 03m

$604

CasperSt. Louis

CPR - STL

CPRSTL

Casper Natrona County

Sun 1/4

5:30 am-5:54 pm

2 stops11h 24m

Lambert-St Louis

Fri 1/16

6:30 am-4:54 pm

2 stops11h 24m

$663

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

Fastest flight time	8h 00m
Direct flights	None

The fastest flight from Casper to St. Louis takes 8h 00m

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

Search flight deals

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. 8h 00m 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 December 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 9,099 reviews		Search United Airlines flights

St. Charles

Chesterfield

Hermann

Fairview Heights

Maryland Heights

O'Fallon

Florissant

Fenton

St. Peters

Wentzville

Collinsville

Alton

Farmington

Clayton

Festus

Glencoe

Eureka

Edwardsville

Litchfield

Shrewsbury

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

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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.