$155 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 12/24. 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 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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Everything you should know

Cheapest round-trip
$348
Overall average: $671
United Airlines
Fri 4/17Sun 4/26
SJO - STL • 2 stops
Cheapest one-way
$155
Typical prices: $186-$214
Frontier
Wed 12/24
SJO - STL • 1 stop
When to travel
October
Cheapest • 21% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Fri, Apr 17 - Sun, Apr 26
United Airlines Logo
7:55 am - 2:27 pm
SJO
-
STL
29h 32m2 stops
United Airlines Logo
6:00 am - 7:37 pm
STL
-
SJO
14h 37m1 stop
$348United Airlines
Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
6:30 am - 3:52 pm
SJO
-
STL
9h 22m1 stop
United Airlines Logo
10:07 am - 6:16 pm
STL
-
SJO
8h 09m1 stop
$357United Airlines
Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
6:30 am - 12:29 pm
SJO
-
STL
29h 59m2 stops
United Airlines Logo
10:07 am - 8:39 pm
STL
-
SJO
10h 32m1 stop
$361United Airlines
Wed, Feb 11 - Sat, Feb 14
United Airlines Logo
6:30 am - 9:13 pm
SJO
-
STL
14h 43m2 stops
United Airlines Logo
4:39 pm - 6:16 pm
STL
-
SJO
25h 37m1 stop
$369United Airlines
Wed, Dec 24 - Wed, Dec 31
United Airlines Logo
8:45 am - 10:43 pm
SJO
-
STL
13h 58m2 stops
United Airlines Logo
6:35 pm - 12:56 pm
STL
-
SJO
18h 21m1 stop
$377United Airlines
Sun, Mar 1 - Wed, Mar 11
American Airlines Logo
12:31 am - 5:05 pm
SJO
-
STL
16h 34m1 stop
American Airlines Logo
5:12 am - 9:43 pm
STL
-
SJO
17h 31m1 stop
$378American Airlines
Wed, Dec 24 - Tue, Mar 24
American Airlines Logo
12:34 am - 10:50 am
SJO
-
STL
10h 16m1 stop
American Airlines Logo
5:00 am - 11:26 am
STL
-
SJO
7h 26m1 stop
$386American Airlines
Fri, Apr 17 - Sun, Apr 26
United Airlines Logo
7:55 am - 12:25 pm
SJO
-
STL
27h 30m2 stops
United Airlines Logo
7:45 am - 12:21 pm
STL
-
SJO
29h 36m2 stops
$390United Airlines
Wed, Dec 24 - Tue, Mar 24
American Airlines Logo
12:34 am - 7:30 pm
SJO
-
STL
18h 56m2 stops
American Airlines Logo
10:20 am - 7:55 pm
STL
-
SJO
10h 35m2 stops
$391American Airlines
Fri, May 22 - Sat, May 30
United Airlines Logo
5:30 am - 10:06 pm
SJO
-
STL
15h 36m1 stop
United Airlines Logo
5:18 pm - 10:11 am
STL
-
SJO
17h 53m2 stops
$399United Airlines
Booking Insights

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 October, where tickets cost $362 on average for one-way flights. On the other hand, the most expensive months are April and February, where the average cost of tickets from Costa Rica is $671 and $491 respectively. For return trips, the best month to travel is October with an average price of $362.

Good to know

Low seasonJanuary
Cheapest flight$155
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly with an average 5% increase in price.
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 tickets can be as cheap as $420. On the other hand, the most expensive day to fly is Monday, where 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 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 2,451 direct flights from within Costa Rica to St. Louis. The most common day for departures is Monday, 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.

Reviews of the 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 9095 reviews
7.7Boarding
7.1Entertainment
8.1Crew
6.6Food
7.3Comfort
Airline reviews

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

10.0 ExcellentMichele, Dec 2025
RSW - ORD
Read more United Airlines reviews

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

For an expensive flight to another country, United has a lot of nerve serving pretzels and no meals (unless, of course, you want to buy something to eat). Unacceptable.

The food is terrible. The same pasta or chicken with bad taste and presentation

United have really come back. Airport and boarding process is clear and good, app and information also very good

The Sears in the 800s are not too good perfect Airbus why cant the new 737 fix that

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

It was probably one of the worst flights I’ve been on. The restrooms were never cleaned or stocked. The food was very subpar, and i usually enjoy airline food, so I was disappointed. It was just all around a bad experience. The only saving grace was the flight attendants.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

It was fine. No drinks nor snacks offered though. I thought that was unusual.

I liked the humor of the captain and crew on the flight from Flagstaff to Dallas. They were humorous.

AA delayed the flight for 3 hours and 50 minutes, but delayed the last 2 hours, 30 minutes at a time, so if we knew before, could have stayed at home and worked instead of being at the airport wasting time... The plane's crew was excellent, not their fault.

After arriving in Dallas, the aircraft taxied for an unusually long time and was unable to park at the gate, which caused a significant delay and made me miss my connecting flight. I then had to wait in a very long line to be rebooked, and I was told that no hotel or meal accommodations would be provided. What is even more unacceptable is that my luggage was mishandled and has still not been located. My suitcase contains important medications that I urgently need, and I have been unable to access them due to the airline’s mishandling. This situation has caused me considerable stress and inconvenience, and I need this issue to be resolved immediately.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Wentzville
Farmington
Eureka
Litchfield
Grafton
Shrewsbury
Glencoe

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

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