CPR - STL

$318 Find Cheap Flights from Casper to St. Louis

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Casper to St. Louis departing on 5/29. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Casper to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Casper to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$318
United Airlines
vie. 5/29lun. 6/1
CPR - STL • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Casper and St. Louis. You'll need at least 1 connection.
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We hope you love your trip to St. Louis!
Flight Deals
Useful Info
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Casper to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Casper to St. Louis

vie., may. 29 - lun., jun. 1
United Airlines Logo
6:13 pm - 11:57 pm
CPR
-
STL
4h 44m
1 stop
United Airlines Logo
5:10 am - 8:51 am
STL
-
CPR
4h 41m
1 stop
$318United Airlines
vie., may. 15 - mar., may. 19
United Airlines Logo
11:23 am - 8:43 pm
CPR
-
STL
8h 20m
1 stop
United Airlines Logo
8:46 am - 5:32 pm
STL
-
CPR
9h 46m
1 stop
$438United Airlines
vie., may. 15 - mar., may. 19
United Airlines Logo
11:23 am - 8:43 pm
CPR
-
STL
8h 20m
1 stop
United Airlines Logo
8:45 am - 10:10 pm
STL
-
CPR
14h 25m
2 stops
$444United Airlines
vie., may. 29 - lun., jun. 1
United Airlines Logo
11:21 am - 9:21 pm
CPR
-
STL
9h 00m
2 stops
United Airlines Logo
5:10 am - 8:51 am
STL
-
CPR
4h 41m
1 stop
$482United Airlines
vie., may. 29 - lun., jun. 1
United Airlines Logo
9:26 am - 9:21 pm
CPR
-
STL
10h 55m
2 stops
United Airlines Logo
7:22 am - 5:34 pm
STL
-
CPR
11h 12m
2 stops
$678United Airlines
vie., may. 15 - mar., may. 19
United Airlines Logo
1:17 pm - 10:50 pm
CPR
-
STL
8h 33m
2 stops
United Airlines Logo
9:21 am - 8:17 pm
STL
-
CPR
11h 56m
2 stops
$733United Airlines
Useful Info

Good to know

Cheapest flight$318
Flight from Casper to St. Louis

When to book flights from Casper to St. Louis

Are your dates flexible? Find out the best times to travel from Casper to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Casper to St. Louis

  • What is the cheapest flight from Casper to St. Louis?

    In the last 3 days, the lowest price for a flight from Casper to St. Louis was $318 for a round-trip ticket.

  • Do I need a passport to fly between Casper and St. Louis?

    A passport is not required to fly from Casper to St. Louis.

  • Which airports will I be using when flying from Casper to St. Louis?

    Casper and St. Louis are both served by 1 main airport. You will leave Casper from Casper Natrona County and will be arriving at Lambert-St Louis.

  • Which aircraft models fly most regularly from Casper to St. Louis?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Casper to St. Louis?

    Star Alliance is the only airline alliance operating flights between Casper and St. Louis.

  • How does KAYAK find such low prices on flights from Casper to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Casper to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Casper to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Casper is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Casper to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Casper with another airline. Booking your flights between Casper and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Casper to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Casper up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Casper to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Casper to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Casper to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9677 reviews
6.6Food
7.7Boarding
7.3Comfort
8.1Crew
7.1Entertainment
Airline reviews

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

4.0 OkayMichael, Apr 2026
SNA - DEN
Read more United Airlines reviews

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

They told us yesterday APR21st that they were cleaning the plane and we got delayed. After that they said they didn't had any crew for the flight so they cancelled the flight till next day.

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight crew on this leg of my trip was very friendly and pleasant. Every one of them was humorous, as well as helpful and accommodating. This group was BY FAR the best crew I’ve flown with. They deserve kudos.

Everything you need to know for your flight from Casper to St. Louis

Information on your arrival and departure airports

Casper (CPR)
St. Louis (STL)