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Cheap flights from Key West to Costa Rica from $618

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Key West to Costa Rica departing on 8/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Key West to Costa Rica

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
1:40 pm - 7:52 pm
EYW
-
SJO
8h 12m
1 stop
American Airlines Logo
6:00 am - 7:39 pm
SJO
-
EYW
11h 39m
1 stop
$618American Airlines
Tue, Aug 18 - Wed, Aug 26
American Airlines Logo
4:50 pm - 12:03 pm
EYW
-
SJO
21h 13m
2 stops
American Airlines Logo
2:56 pm - 12:55 pm
SJO
-
EYW
19h 59m
2 stops
$623American Airlines
Tue, Aug 18 - Wed, Aug 26
Multiple Airlines Logo
12:59 pm - 8:55 am
EYW
-
SJO
20h 56m
1 stop
Multiple Airlines Logo
7:00 am - 10:19 am
SJO
-
EYW
26h 19m
1 stop
$633Multiple Airlines
Fri, Dec 11 - Mon, Dec 14
American Airlines Logo
12:00 pm - 8:49 pm
EYW
-
SJO
9h 49m
1 stop
American Airlines Logo
3:38 pm - 2:15 pm
SJO
-
EYW
21h 37m
2 stops
$752American Airlines
Fri, Dec 11 - Mon, Dec 14

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American Airlines flights from Key West to Costa Rica

Our best American Airlines deals on Key West to Costa Rica flight tickets
American Airlines
Aug 18
EYW1:40 pmKey West
8h 12m
1 stop
SJO7:52 pmSan José Juan Santamaria Intl
Aug 26
SJO6:00 amSan José Juan Santamaria Intl
11h 39m
1 stop
EYW7:39 pmKey West
$618
American Airlines
Aug 18
EYW4:50 pmKey West
21h 13m
2 stops
SJO12:03 pmSan José Juan Santamaria Intl
Aug 26
SJO2:56 pmSan José Juan Santamaria Intl
19h 59m
2 stops
EYW12:55 pmKey West
$623
American Airlines
Dec 11
EYW12:00 pmKey West
9h 49m
1 stop
SJO8:49 pmSan José Juan Santamaria Intl
Dec 14
SJO3:38 pmSan José Juan Santamaria Intl
21h 37m
2 stops
EYW2:15 pmKey West
$752

momondo Fare Finder

 
Customize your flight search to find flights from Key West to Costa Rica that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 24, 2026.
Use the filters below to find and compare flights from Key West to Costa Rica that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Key WestSan José

EYW - SJO

EYWSJO

Key West

Tue 8/18

1:40 pm-7:52 pm

1 stop8h 12m

San José Juan Santamaria Intl

Wed 8/26

6:00 am-7:39 pm

1 stop11h 39m

$618

Key WestSan José

EYW - SJO

EYWSJO

Key West

Tue 8/18

4:50 pm-12:03 pm

2 stops21h 13m

San José Juan Santamaria Intl

Wed 8/26

2:56 pm-12:55 pm

2 stops19h 59m

$623

Key WestSan José

EYW - SJO

EYWSJO

Key West

Fri 12/11

12:59 pm-8:55 am

1 stop20h 56m

San José Juan Santamaria Intl

Mon 12/14

7:00 am-10:19 am

1 stop26h 19m

$633

Key WestSan José

EYW - SJO

EYWSJO

Key West

Fri 12/11

12:00 pm-8:49 pm

1 stop9h 49m

San José Juan Santamaria Intl

Mon 12/14

3:38 pm-2:15 pm

2 stops21h 37m

$752

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Cheap Key West to Costa Rica flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Key West to Costa Rica

Fastest flight time

20h 56m

Direct flights

None
The fastest flight from Key West to Costa Rica takes 20h 56m
There are no direct flights from Key West to Costa Rica. There are no popular flight routes from Key West to Costa Rica.
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Frequently asked questions about flying from Key West to Costa Rica

  • When did momondo last update prices for flights from Key West Airport to Costa Rica?

    Prices for flights from Key West Airport to Costa Rica refresh daily.

  • How many operators does momondo search for flights from Key West Airport to Costa Rica?

  • How old do you have to be to fly from Key West Airport to Costa Rica?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Key West Airport to Costa Rica.

  • What documentation or ID do you need to fly to Costa Rica?

    The travel and health documents you'll need for your trip to Costa Rica may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Costa Rica. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Key West to Costa Rica

Compare and see reviews for airlines that fly from Key West to Costa Rica with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $523Free CancellationRating
7.1
11,751 reviews
Search American Airlines flights

Frequently asked questions about flying from Key West to Costa Rica

  • How do I get Price Alerts for flights from Key West to Costa Rica?

    Confirm your travel details to search for the latest offers for flights from Key West to Costa Rica. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Key West to Costa Rica with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Why use momondo?

Why should I use momondo to find a flight deal from Key West to Costa Rica?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Costa Rica from Key West.

Can I find flights from Key West to Costa Rica with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Key West to Costa Rica flights to just show those with flexible booking policies.

How can momondo help me find flights from Key West to Costa Rica?

momondo helps you find the best flight between Key West and Costa Rica by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Key West to Costa Rica right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Costa Rica, momondo offers a useful price alert feature which will track prices for flights to Costa Rica from Key West and alert you when they change.

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Fri 7/24
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