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Cheap flights from Seattle to Costa Rica from $166

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Costa Rica departing on 3/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:40 am - 11:15 pm
SEA
-
SJO
14h 35m
2 stops
Multiple Airlines Logo
5:45 am - 8:42 pm
SJO
-
SEA
15h 57m
2 stops
$369Multiple Airlines
Sat, Apr 11 - Thu, Apr 16
Multiple Airlines Logo
7:40 am - 11:15 pm
SEA
-
SJO
14h 35m
2 stops
Multiple Airlines Logo
5:45 am - 6:51 pm
SJO
-
SEA
14h 06m
2 stops
$378Multiple Airlines
Thu, Apr 9 - Tue, Apr 21
American Airlines Logo
8:04 am - 10:30 pm
SEA
-
SJO
12h 26m
1 stop
American Airlines Logo
8:00 am - 11:42 pm
SJO
-
SEA
17h 42m
1 stop
$379American Airlines
Sun, Feb 1 - Wed, Feb 4
American Airlines Logo
8:04 am - 10:30 pm
SEA
-
SJO
12h 26m
1 stop
American Airlines Logo
6:00 am - 8:45 pm
SJO
-
SEA
16h 45m
2 stops
$384American Airlines
Sun, Feb 1 - Wed, Feb 4
Multiple Airlines Logo
9:14 pm - 11:15 pm
SEA
-
SJO
24h 01m
2 stops
Multiple Airlines Logo
7:05 am - 5:09 pm
SJO
-
SEA
35h 04m
2 stops
$391Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
American Airlines Logo
6:00 am - 10:30 pm
SEA
-
SJO
14h 30m
2 stops
American Airlines Logo
6:00 am - 8:45 pm
SJO
-
SEA
16h 45m
2 stops
$407American Airlines
Tue, Feb 3 - Tue, Feb 10
American Airlines Logo
8:04 am - 10:30 pm
SEA
-
SJO
12h 26m
1 stop
American Airlines Logo
2:54 pm - 9:37 am
SJO
-
SEA
20h 43m
1 stop
$409American Airlines
Mon, Feb 2 - Mon, Feb 9
Alaska Airlines Logo
3:55 pm - 6:45 am
SEA
-
LIR
12h 50m
2 stops
Alaska Airlines Logo
7:08 pm - 11:03 am
LIR
-
SEA
17h 55m
2 stops
$432Alaska Airlines
Mon, Feb 23 - Mon, Mar 2
Alaska Airlines Logo
9:14 pm - 4:58 pm
SEA
-
LIR
17h 44m
1 stop
Alaska Airlines Logo
4:47 pm - 8:47 am
LIR
-
SEA
17h 00m
1 stop
$436Alaska Airlines
Sat, Mar 7 - Sat, Mar 14
Alaska Airlines Logo
11:30 am - 6:20 am
SEA
-
LIR
17h 50m
2 stops
Alaska Airlines Logo
6:12 pm - 2:38 pm
LIR
-
SEA
21h 26m
2 stops
$440Alaska Airlines
Tue, Apr 7 - Wed, Apr 15

American Airlines flights from Seattle to Costa Rica

Our best American Airlines deals on Seattle to Costa Rica flight tickets
American Airlines
Feb 1
SEA8:04 amSeattle/Tacoma Intl
12h 26m
1 stop
SJO10:30 pmSan José Juan Santamaria Intl
Feb 4
SJO8:00 amSan José Juan Santamaria Intl
17h 42m
1 stop
SEA11:42 pmSeattle/Tacoma Intl
$379
American Airlines
Feb 1
SEA8:04 amSeattle/Tacoma Intl
12h 26m
1 stop
SJO10:30 pmSan José Juan Santamaria Intl
Feb 4
SJO6:00 amSan José Juan Santamaria Intl
16h 45m
2 stops
SEA8:45 pmSeattle/Tacoma Intl
$384
American Airlines
Feb 3
SEA6:00 amSeattle/Tacoma Intl
14h 30m
2 stops
SJO10:30 pmSan José Juan Santamaria Intl
Feb 10
SJO6:00 amSan José Juan Santamaria Intl
16h 45m
2 stops
SEA8:45 pmSeattle/Tacoma Intl
$407

United Airlines flights from Seattle to Costa Rica

Our best United Airlines deals on Seattle to Costa Rica flight tickets
United Airlines
Feb 4
SEA5:10 pmSeattle/Tacoma Intl
13h 22m
1 stop
SJO8:32 amSan José Juan Santamaria Intl
Feb 11
SJO6:30 amSan José Juan Santamaria Intl
16h 42m
2 stops
SEA9:12 pmSeattle/Tacoma Intl
$444
United Airlines
Jan 21
SEA7:00 amSeattle/Tacoma Intl
11h 39m
1 stop
SJO8:39 pmSan José Juan Santamaria Intl
Jan 27
SJO9:40 amSan José Juan Santamaria Intl
13h 32m
1 stop
SEA9:12 pmSeattle/Tacoma Intl
$527
United Airlines
Jan 25
SEA7:00 amSeattle/Tacoma Intl
11h 39m
1 stop
SJO8:39 pmSan José Juan Santamaria Intl
Feb 1
SJO9:40 amSan José Juan Santamaria Intl
10h 47m
1 stop
SEA6:27 pmSeattle/Tacoma Intl
$531

momondo Fare Finder

 
Customize your flight search to find flights from Seattle 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 January 20, 2026.
Use the filters below to find and compare flights from Seattle to Costa Rica that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSan José

SEA - SJO

SEASJO

Seattle/Tacoma Intl

Sat 4/11

7:40 am-11:15 pm

2 stops14h 35m

San José Juan Santamaria Intl

Thu 4/16

5:45 am-8:42 pm

2 stops15h 57m

$369

SeattleSan José

SEA - SJO

SEASJO

Seattle/Tacoma Intl

Thu 4/9

7:40 am-11:15 pm

2 stops14h 35m

San José Juan Santamaria Intl

Tue 4/21

5:45 am-6:51 pm

2 stops14h 06m

$378

SeattleSan José

SEA - SJO

SEASJO

Seattle/Tacoma Intl

Sun 2/1

8:04 am-10:30 pm

1 stop12h 26m

San José Juan Santamaria Intl

Wed 2/4

8:00 am-11:42 pm

1 stop17h 42m

$379

SeattleSan José

SEA - SJO

SEASJO

Seattle/Tacoma Intl

Sun 2/1

8:04 am-10:30 pm

1 stop12h 26m

San José Juan Santamaria Intl

Wed 2/4

6:00 am-8:45 pm

2 stops16h 45m

$384

SeattleSan José

SEA - SJO

SEASJO

Seattle/Tacoma Intl

Mon 3/2

9:14 pm-11:15 pm

2 stops24h 01m

San José Juan Santamaria Intl

Mon 3/9

7:05 am-5:09 pm

2 stops35h 04m

$391

SeattleSan José

SEA - SJO

SEASJO

Seattle/Tacoma Intl

Tue 2/3

6:00 am-10:30 pm

2 stops14h 30m

San José Juan Santamaria Intl

Tue 2/10

6:00 am-8:45 pm

2 stops16h 45m

$407

SeattleSan José

SEA - SJO

SEASJO

Seattle/Tacoma Intl

Mon 2/2

8:04 am-10:30 pm

1 stop12h 26m

San José Juan Santamaria Intl

Mon 2/9

2:54 pm-9:37 am

1 stop20h 43m

$409

SeattleLiberia

SEA - LIR

SEALIR

Seattle/Tacoma Intl

Mon 2/23

3:55 pm-6:45 am

2 stops12h 50m

Liberia

Mon 3/2

7:08 pm-11:03 am

2 stops17h 55m

$432

SeattleLiberia

SEA - LIR

SEALIR

Seattle/Tacoma Intl

Sat 3/7

9:14 pm-4:58 pm

1 stop17h 44m

Liberia

Sat 3/14

4:47 pm-8:47 am

1 stop17h 00m

$436

SeattleLiberia

SEA - LIR

SEALIR

Seattle/Tacoma Intl

Tue 4/7

11:30 am-6:20 am

2 stops17h 50m

Liberia

Wed 4/15

6:12 pm-2:38 pm

2 stops21h 26m

$440

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Costa Rica from

How to get the cheapest flight ticket from Seattle to Costa Rica

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Costa Rica?

The cheapest month to fly to Costa Rica from Seattle is in October. Flight prices, which tend to average around $495, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in October, then September is your next best option. Flight prices from Seattle to Costa Rica during September average around $502.

What is the cheapest Seattle/Tacoma Intl to Costa Rica flight route?

Fly from Seattle/Tacoma Intl to Liberia for the best Seattle/Tacoma Intl - Costa Rica flight prices

How far in advance should I book a flight to Costa Rica?

You are more likely to see cheaper flights to Costa Rica from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Costa Rica for around $614 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Costa Rica from Seattle for as low as $536 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Costa Rica flights?

There are 3 cabin classes available to choose from on Seattle/Tacoma Intl to Costa Rica flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to Costa Rica flights?

You could potentially save up to 25% on your flight if you consider stops on a Seattle to Costa Rica flight.

Cheap Seattle to Costa Rica flight deals and tips

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

Fastest flight time

7h 02m

Direct flights

Sun

Airports in Costa Rica

40 airports
The fastest flight from Seattle to Costa Rica takes 7h 02m
Direct flights go from Seattle to Costa Rica on Sunday. There are no airlines offering direct flights.
There are 40 airports in Costa Rica. From Seattle there are direct flights to Liberia (LIR).
Search flight deals

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Costa Rica?

    Prices for flights from Seattle/Tacoma Intl Airport to Costa Rica refresh daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Costa Rica?

  • How old do you have to be to fly from Seattle/Tacoma Intl 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 Seattle/Tacoma Intl Airport to Costa Rica.

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

    The necessary travel and health documents for your Costa Rica trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Seattle to Costa Rica?

Best airlines flying from Seattle to Costa Rica

Compare and see reviews for airlines that fly from Seattle to Costa Rica with momondo
Airline
Rating
Free Cancellation
Price
AviancaPriceFrom $152Free CancellationRating
6.6
2,496 reviews
Search Avianca flights
DeltaPriceFrom $280Free CancellationRating
7.9
8,085 reviews
Search Delta flights
American AirlinesPriceFrom $346Free CancellationRating
7.2
11,169 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $366Free CancellationRating
8.0
11,764 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $390Free CancellationRating
7.4
9,189 reviews
Search United Airlines flights
SouthwestPriceFrom $572Free CancellationRating
8.0
4,266 reviews
Search Southwest flights
AeromexicoPriceFrom $809Free CancellationRating
7.4
1,596 reviews
Search Aeromexico flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Costa Rica for you.

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

All flight searches from Seattle to Costa Rica on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential Seattle to Costa Rica flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are not ready to book a flight from Seattle to Costa Rica now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Costa Rica and let you know when they change.

An easier way to manage your Costa Rica trip

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Find better results for your trip to Costa Rica

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Popular flights according to clicks in the last 7 days on momondo
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