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 8/14. 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

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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Flights 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

Thu, Aug 14 - Mon, Aug 18
United Airlines Logo
5:59 pm - 11:59 pmCPR-STL
5h 00m1 stop
United Airlines Logo
4:45 pm - 10:14 pmSTL-CPR
6h 29m1 stop
$318United Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
United Airlines Logo
5:50 pm - 11:53 pmCPR-STL
5h 03m1 stop
United Airlines Logo
5:15 am - 10:50 amSTL-CPR
6h 35m1 stop
$338United Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
United Airlines Logo
5:50 pm - 11:53 pmCPR-STL
5h 03m1 stop
United Airlines Logo
8:15 am - 10:14 pmSTL-CPR
14h 59m2 stops
$344United Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
United Airlines Logo
5:30 am - 3:44 pmCPR-STL
9h 14m2 stops
United Airlines Logo
3:20 pm - 10:14 pmSTL-CPR
7h 54m2 stops
$389United Airlines
Find Deal
Thu, Aug 14 - Mon, Aug 18
United Airlines Logo
7:10 am - 10:45 pmCPR-STL
14h 35m2 stops
United Airlines Logo
4:45 pm - 10:14 pmSTL-CPR
6h 29m1 stop
$454United Airlines
Find Deal
Thu, Aug 14 - Mon, Aug 18
United Airlines Logo
11:29 am - 10:45 pmCPR-STL
10h 16m2 stops
United Airlines Logo
5:00 am - 12:39 pmSTL-CPR
8h 39m2 stops
$680United Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Casper to St. Louis flights

Get data-powered insights and trends into flights from Casper to St. Louis to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Casper to St. Louis?

The average price of all round-trip flights from Casper to St. Louis clicked on KAYAK for each day over the last 12 months.

For Casper to St. Louis, Thursday is the cheapest day to fly on average and Saturday is the most expensive. Flying from St. Louis back to Casper, the best deals are generally found on Saturday, with Tuesday being the most expensive.

Good to know

Low seasonAugust
Cheapest flight$318
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly with an average 33% increase in price.
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 8904 reviews
7.7Boarding
7.3Comfort
7.1Entertainment
6.6Food
8.1Crew
Airline reviews

Terrible. Delayed 7 hours, and cancelled the flight, leaving me stranded and out of pocket $500 for an alternative last minute flight

2.0 MediocreV, Jul 2025MIA - EWR
Read more United Airlines reviews

Terrible. Delayed 7 hours, and cancelled the flight, leaving me stranded and out of pocket $500 for an alternative last minute flight

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

Not a great experience. We paid for the upgrade for premium economy seats and seated ourselves in very comfortable seats. Someone came along with the same seat on their boarding pass. The aircraft had been changed and as a result we were booted out and sent further back to small uncomfortable seats. After complaining we were moved to emergency row seats, which gave us more leg room but the seats don’t recline. For people in our 70’s we found having to sit upright from California to NJ very uncomfortable. Not sure why they chose to move senior citizens instead of the two people that were allowed to take the more comfortable seats. Not happy.

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

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

Information on your arrival and departure airports

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