$136 Find Cheap Flights from St. Louis to Costa Rica

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Costa Rica departing on 12/4. 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

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Cheap Flights from St. Louis to Costa Rica

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
San José
San José1 stop$312
Liberia
Liberia1 stop$349
San José
San José1 stop$312
Liberia
Liberia1 stop$349

Book Cheap St. Louis to Costa Rica Plane Tickets

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

Tue, Jan 20 - Thu, Feb 19
Multiple Airlines Logo
5:11 pm - 11:27 amSTL-SJO
18h 16m1 stop
Multiple Airlines Logo
12:22 pm - 10:33 pmSJO-STL
10h 11m1 stop
$312Multiple Airlines
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Thu, Jan 22 - Thu, Feb 19
Multiple Airlines Logo
12:20 pm - 12:21 amSTL-SJO
12h 01m1 stop
Multiple Airlines Logo
12:22 pm - 10:33 pmSJO-STL
10h 11m1 stop
$317Multiple Airlines
Find Deal
Fri, Jan 9 - Thu, Jan 15
Delta Logo
7:10 am - 1:50 pmSTL-LIR
6h 40m1 stop
Delta Logo
2:05 pm - 11:39 pmLIR-STL
9h 34m1 stop
$349Delta
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Fri, Jan 9 - Thu, Jan 15
American Airlines Logo
3:54 pm - 12:12 pmSTL-LIR
20h 18m2 stops
American Airlines Logo
3:13 pm - 10:22 amLIR-STL
19h 09m2 stops
$353American Airlines
Find Deal
Fri, Jan 9 - Thu, Jan 15
American Airlines Logo
3:37 pm - 2:20 pmSTL-LIR
22h 43m1 stop
American Airlines Logo
3:13 pm - 11:59 pmLIR-STL
8h 46m1 stop
$356American Airlines
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Tue, Nov 18 - Tue, Nov 25
Delta Logo
11:39 am - 10:07 pmSTL-SJO
10h 28m1 stop
Delta Logo
7:00 am - 4:07 pmSJO-STL
9h 07m1 stop
$360Delta
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Thu, Jan 8 - Sun, Jan 11
United Airlines Logo
8:05 am - 6:37 pmSTL-LIR
10h 32m2 stops
United Airlines Logo
2:01 pm - 10:58 pmLIR-STL
8h 57m1 stop
$373United Airlines
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Wed, Dec 17 - Tue, Dec 23
United Airlines Logo
11:10 am - 6:37 pmSTL-LIR
7h 27m1 stop
United Airlines Logo
12:30 pm - 10:43 pmLIR-STL
10h 13m1 stop
$468United Airlines
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Wed, Apr 1 - Mon, Apr 6
Southwest Logo
5:35 am - 1:05 pmSTL-LIR
8h 30m1 stop
Southwest Logo
2:05 pm - 12:05 amLIR-STL
9h 00m1 stop
$602Southwest
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Wed, Apr 1 - Mon, Apr 6
Southwest Logo
8:45 pm - 1:05 pmSTL-LIR
17h 20m2 stops
Southwest Logo
2:05 pm - 9:00 amLIR-STL
17h 55m2 stops
$620Southwest
Find Deal
Booking Insights

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

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

What is the cheapest month to fly from St. Louis to Costa Rica?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Costa Rica, 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 from St. Louis to Costa Rica is October, when tickets cost $427 (return) on average. On the other hand, the most expensive months are December and February, when the average cost of round-trip tickets is $1,100 and $661 respectively.

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

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

If you are looking for a flight deal from St. Louis to Costa Rica, look for departures on Tuesdays and avoid leaving on a Saturday, as it's usually the priciest day. When flying back from Costa Rica, Tuesday is the cheapest day to fly and Monday is the most expensive.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Costa Rica, 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 on the flight from St. Louis to Costa Rica, you should book around 2 weeks before departure, which saves you about 15% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Low seasonOctober
Cheapest flight$136
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly with an average 16% increase in price.
Flight from St. Louis to San José

FAQs - booking Costa Rica flights

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

    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 St. Louis to Costa Rica.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis to Costa Rica 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 St. Louis to Costa Rica?

    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 from St. Louis to Costa Rica 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 from St. Louis to Costa Rica?

    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 from St. Louis to Costa Rica 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 Costa Rica?

    The cheapest time of day to fly to Costa Rica is generally at night, when round-trip flights cost $427 on average. Morning departures are around 34% more expensive than evening flights, on average. The most expensive time of day to fly to Costa Rica is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $604.

Reviews of the top 5 airlines serving from St. Louis to Costa Rica

 
Need help choosing which airline to fly with from St. Louis to Costa Rica? 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.
8.0
SouthwestOverall score based on 4235 reviews
8.1Boarding
8.6Crew
8.0Comfort
7.0Food
7.5Entertainment
Airline reviews

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

10.0 ExcellentAnonymous, Oct 2025MDW - BWI
Read more Southwest reviews

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

mandatory demand customer to check their carry on because not enough people check bags.

Connecting flight is on time and boarding was a breeze!

Excellent. Would encourage Southwest to keep current boarding procedures with free style seating. Makes for a fantastic experience

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Old plane and old configuration/seats but still comfortable for a morning flight

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

Friendly and professional flight crew. Aside from departure delay after boarding, easy flight and smooth landing.

Great smooth flight. Had a seating change, but that was an improvement. Thanks United Airways Crew.

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

The flight attendant, a black woman with curly hair who sat near Row 21, was wonderful and kind.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

Flight delayed and missed connection. Rescheduled flight cancelled after 6 hrs wait. Rerouted thru ORD, flight cancelled, overnight stay in ORD. Still in the air on new flight!

We are too tired and frustrated to comment politely at this point

Terrible. Our luggage was delayed and couldn’t be delivered for several days. We got bad information from the airline agents at baggage claim. We had to pick up our car so we wouldn’t be charged for an extra day. We got lost in the maze of airport parking. The baggage claim agents didn’t offer us any compensation for our extra time and expense. We are tired, hungry and very frustrated.

The flight was flawless and we even arrived between 20 and 25 minutes early!

The only thing to like was that we eventually got to our destination

Delayed delayed delayed and no offer for food or vouchers

Disliked having to wait a little longer to disembark from the plan when we landed in London

Excessive fees for flight delays. What a Scam. I was not able to attend the wedding I needed to go.

Waited at the airport for over 4 hours to board this flight. Terrible airline

Was supposed to take off 8:00 last night. Got delayed till 8:00 this morning

It was terrible, we had to board and unboard the flight with a hour delay that caused me to miss an appointment and a surprise for my wife

When the flight ticket is expensive and you have to purchase check in luggage and there is no snacks, no entertainment, tight seats stuffed in the back of the plane not such good experience. I would like some to reach out to me . I paid for check luggage when I bought the ticket they made me pay again on the return flight extra $70. Very frustrating.

Excellent experience when I am looking for a budget airline where the main expectation is getting me from point A to point B with no frills.

Great! I intend to use Spirit for future flights. No complaints .

Seats are not very comfortable, maybe a little more padding for a 2hr plus flight

Very sad about what Spirit has become, because the flights I had with them were delayed between an hour and a half and two, terrible service

Vegas is such a quick flight that amenities aren’t the important part, in my opinion. Just get me there efficiently and safely, and that’s exactly what they did!

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

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