$224 Find Cheap Flights from Costa Rica to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to St. Louis departing on 10/18. 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.
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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 for flights 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 for flights to St. Louis, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Costa Rica to St. Louis

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Costa Rica 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.

Recent round-trip flight deals from Costa Rica to St. Louis

KAYAK's recommended round-trip deals from the most popular airlines that fly from Costa Rica to St. Louis.
Discover the best prices for you by selecting your travel dates on KAYAK.
 Logo
11:32 am - 11:52 pmSJO-STL
11h 20m1 stop
 Logo
5:45 pm - 10:27 amSTL-SJO
17h 42m1 stop
Thu, May 22 - Wed, May 28
 Logo
12:28 pm - 11:52 pmSJO-STL
10h 24m2 stops
 Logo
5:45 pm - 10:27 amSTL-SJO
17h 42m1 stop
Thu, May 22 - Wed, May 28
American Airlines Logo
6:03 am - 5:29 pmSJO-STL
10h 26m1 stop
American Airlines Logo
7:00 am - 10:17 pmSTL-SJO
16h 17m1 stop
$336American Airlines
Find Deal
Wed, May 21 - Wed, May 28
United Airlines Logo
1:30 pm - 3:30 pmSJO-STL
25h 00m2 stops
United Airlines Logo
6:30 am - 10:39 pmSTL-SJO
17h 09m2 stops
$340United Airlines
Find Deal
Wed, May 21 - Wed, May 28
United Airlines Logo
7:55 am - 10:40 amSJO-STL
25h 45m2 stops
United Airlines Logo
10:15 am - 10:39 pmSTL-SJO
13h 24m1 stop
$363United Airlines
Find Deal
Fri, Jul 18 - Thu, Jul 31
United Airlines Logo
5:30 am - 9:34 amSJO-STL
27h 04m1 stop
United Airlines Logo
10:15 am - 12:26 pmSTL-SJO
27h 11m1 stop
$374United Airlines
Find Deal
Fri, Jul 18 - Thu, Jul 31
United Airlines Logo
6:35 am - 8:48 pmSJO-STL
13h 13m1 stop
United Airlines Logo
10:22 am - 10:39 pmSTL-SJO
13h 17m1 stop
$379United Airlines
Find Deal
Sat, May 31 - Thu, Jun 5
American Airlines Logo
2:15 pm - 8:56 amSJO-STL
17h 41m2 stops
American Airlines Logo
7:30 pm - 11:19 amSTL-SJO
16h 49m2 stops
$407American Airlines
Find Deal
Thu, May 22 - Wed, May 28
Alaska Airlines Logo
1:06 am - 12:04 amSJO-STL
21h 58m2 stops
Alaska Airlines Logo
6:22 pm - 11:46 pmSTL-SJO
30h 24m2 stops
$682Alaska Airlines
Find Deal
Tue, May 20 - Wed, May 28
Alaska Airlines Logo
1:06 am - 12:04 amSJO-STL
21h 58m2 stops
Alaska Airlines Logo
6:22 pm - 11:46 pmSTL-SJO
30h 24m2 stops
$737Alaska Airlines
Find Deal
Wed, May 21 - Wed, May 28
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KAYAK's insights & trends for flights to St. Louis

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

What is the cheapest month to fly to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights to St. Louis is July, where tickets cost $386 on average for return flights. On the other hand, the most expensive months are April and June, where the average cost of tickets from Costa Rica is $676 and $543 respectively. For one-way flights, the best month to travel is July with an average price of $386.

How far in advance should I book a flight to St. Louis?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.


Good to know

Low seasonMarch
High seasonJuly
Cheapest flight$224
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly and prices are also 20% lower on average.
Flight from San José to St. Louis

FAQs - booking St. Louis flights

  • How far is Lambert-St Louis Airport from central St. Louis?

    The city center of St. Louis is 13 miles from Lambert-St Louis Airport.

  • What is the name of St. Louis’s airport?

    There is only 1 airport in St. Louis, called Lambert-St Louis Airport (STL). It can also be referred to as Lambert Field, Lambert-St Louis, St. Louis Lambert, or St. Louis Lambert Intl.

  • What is the cheapest day to fly to St. Louis?

    Based on KAYAK data, the cheapest day to fly to St. Louis is Tuesday where round-trip tickets can be as cheap as $420. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $690 on average.

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

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

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

  • What is the Hacker Fare option on flights 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to St. Louis?

    The cheapest time of day to fly to St. Louis is generally in the morning, when round-trip flights cost $479 on average. The most expensive time of day to fly to St. Louis is generally in the evening, which is peak travel time and where the average cost of a ticket is $561.

  • How many direct flights to St. Louis are there each week?

    Each week there are around 1,533 direct flights from within Costa Rica to St. Louis. The most common day for departures is Sunday, with 16% of flights taking off on this day.

Top tips for finding cheap flights to St. Louis

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest St. Louis flight deals.

Top airlines flying from Costa Rica to St. Louis

 
See real verified KAYAK customer reviews for airlines flying to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Costa Rica to St. Louis. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with 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 8696 reviews
6.6Food
7.1Entertainment
7.7Boarding
8.1Crew
7.3Comfort
Airline reviews

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

10.0 ExcellentMohammad Hassan Mirzai, May 2025HKG - SFO
Read more United Airlines reviews

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

A bit rush for transit. Food and entertainment are not available

So far so good but food and entertainment are not available for this flight

Multiple delays and not straight answer from the United team

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

The plane pushed back from the gate on time. However, it stopped on the ramp, and we waited for over 20 minutes before the aircraft pulled back to the gate. Apparently, something of importance had to be removed from the aircraft by the gate agent. I found this to be odd. The delay was not significant, but I felt that whatever was on the aircraft that had to be taken off, should’ve been done before we pushed back from the gate.

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

Pitch was very small. Knees were on the seat back in front of me.

Paid $35 and not able to access the internet at all.

Several delays. Next flight was worse. Did not arrive home until 2am PT

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

First world problems, but still… We were seated in first class and asked for a cocktail on a very short, 50 minute flight. After our drink order was taken, a half hour went by, and we noticed that every other person in the small plane had been served except for us. We got up to ask about it, the drinks finally came, then were taken away three minutes later since the flight was so short. Really strange situation, on the other hand, we were in Utah.

We missed our flight. The boarding pass had the wrong gate and by the time we received the text from Kayak, our flight was already gone. I’ll never use Kayak again and will go direct to the airlines in the future.

Boarding took forever, the plane was cramped and cold, and the seatbelt song came on constantly throughout the red eye flight with a loud pre-recorded message playing each time

Cabin felt crammed Snacks are lame But crew was super efficient getting us out on time despite delay

Flight was delayed bc of mechanical issue. New plane had different configuration so some seats had to be switched. They called all passengers who needed new boarding cards. They did not call us so we thought our seats were the same and fine. When we boarded they informed us our receipts had changed and we are now all sitting separate and in the back row. Both my daughters had meltdowns and started to cry and once we got on the flight, we figured out how we could sit closer to each other, but this was very upsetting.

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

Information on the airport you'll fly into in St. Louis

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