$138 Find Cheap Flights from Seattle 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 Seattle to Costa Rica departing on 10/20. 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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Best Costa Rica Flight Deals from Seattle

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
San José
San José2 stops$318
Liberia
Liberia1 stop$445
San José
San José2 stops$318
Liberia
Liberia1 stop$445

Cheap Flights from Seattle to Costa Rica

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

Mon, Sep 1 - Mon, Sep 8
 Logo
4:20 pm - 7:40 amSEA-SJO
14h 20m2 stops
 Logo
4:20 pm - 9:40 amSJO-SEA
18h 20m2 stops
Thu, Sep 4 - Mon, Sep 22
 Logo
4:20 pm - 7:40 amSEA-SJO
14h 20m2 stops
 Logo
4:20 pm - 9:40 amSJO-SEA
18h 20m2 stops
Tue, Oct 7 - Sat, Oct 11
Alaska Airlines Logo
7:30 pm - 7:04 pmSEA-SJO
22h 34m2 stops
Alaska Airlines Logo
6:30 am - 8:35 pmSJO-SEA
15h 05m2 stops
$419Alaska Airlines
Find Deal
Mon, Oct 6 - Sat, Oct 11
Alaska Airlines Logo
8:52 pm - 7:04 pmSEA-SJO
45h 12m2 stops
Alaska Airlines Logo
6:30 am - 8:35 pmSJO-SEA
15h 05m2 stops
$434Alaska Airlines
Find Deal
Mon, Oct 6 - Wed, Oct 15
Delta Logo
11:35 pm - 12:00 pmSEA-LIR
11h 25m1 stop
Delta Logo
1:25 pm - 12:11 amLIR-SEA
11h 46m1 stop
$445Delta
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Sun, Oct 26 - Thu, Nov 6
American Airlines Logo
5:43 pm - 12:59 pmSEA-LIR
18h 16m1 stop
American Airlines Logo
3:00 pm - 9:36 amLIR-SEA
20h 36m1 stop
$449American Airlines
Find Deal
Sun, Oct 26 - Thu, Nov 6
American Airlines Logo
11:20 pm - 11:45 amSEA-LIR
11h 25m2 stops
American Airlines Logo
3:25 pm - 9:36 amLIR-SEA
20h 11m2 stops
$453American Airlines
Find Deal
Sat, Nov 1 - Sun, Nov 16
Delta Logo
3:55 pm - 12:48 pmSEA-SJO
19h 53m1 stop
Delta Logo
7:00 am - 12:14 amSJO-SEA
19h 14m1 stop
$456Delta
Find Deal
Mon, Aug 11 - Mon, Aug 18
United Airlines Logo
11:58 pm - 10:11 amSEA-SJO
9h 13m1 stop
United Airlines Logo
8:45 am - 6:58 pmSJO-SEA
11h 13m1 stop
$473United Airlines
Find Deal
Tue, Jul 22 - Mon, Jul 28
United Airlines Logo
11:58 pm - 10:11 amSEA-SJO
9h 13m1 stop
United Airlines Logo
8:45 am - 8:56 pmSJO-SEA
13h 11m1 stop
$494United Airlines
Find Deal
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KAYAK's insights & trends for Seattle to Costa Rica flights

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

What is the cheapest Seattle to Costa Rica flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Seattle to Costa Rica.

The cheapest ticket to Costa Rica from Seattle found in the last 72 hours was to Liberia, at $758 round-trip. The most popular route is from Seattle (SEA) to Liberia (LIR), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $758.

What is the cheapest month to fly from Seattle to Costa Rica?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle 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 Seattle to Costa Rica is May, when tickets cost $547 (return) on average. On the other hand, the most expensive months are December and April, when the average cost of round-trip tickets is $854 and $730 respectively.

What’s the cheapest day of the week to fly from Seattle to Costa Rica?

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

For Seattle to Costa Rica, Tuesday is the cheapest day to fly on average and Friday is the most expensive. Flying from Costa Rica back to Seattle, the best deals are generally found on Wednesday, with Monday being the most expensive.

How far in advance should I book a flight from Seattle 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 Seattle 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 Seattle to Costa Rica, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.


Good to know

Low seasonSeptember
High seasonFebruary
Cheapest flight$138
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Seattle to San José

FAQs - booking Costa Rica flights

  • What type of travel documents will I need to fly from Seattle to Costa Rica?

    Citizens of the United States traveling from Seattle to Costa Rica need a valid passport for the trip, and the passport must be valid for the entire length of their stay. There is no need to have a visa when you travel as a tourist so long as you do not plan on staying for more than 90 days, but you do need to provide a return plane ticket to customs authorities.

  • When renting a car in Costa Rica, what child car seat laws do I need to know about?

    Car seats are mandatory for any children 12 years old and under or for those that are 57 inches or shorter. Any child up to one year of age must be in a rear-facing car seat in the middle seat in the rear of the vehicle. Children from one year to four years old need to be in a front-facing car seat in the middle seat. Children from four to six years old must be in a booster seat with a back, and children from six years old to 12 years old need to be in a booster seat without a back.

  • Are there any good public transportation options to get me from San José Juan Santamaria International Airport to downtown San Jose?

    A quick and convenient way to get from the airport to the downtown area is aboard TUASA bus line 200 Alajuela, which makes the trip from the airport to downtown in around 30min.

  • If I am traveling to the seaside community of Golfito in Costa Rica, what is a good airport to use?

    Your best bet is to fly to the San José Juan Santamaria International Airport and then travel aboard the bus service offered by the Grupo Blanco number 699 bus that can make the trip in around 3h.

  • How does KAYAK find such low prices on flights from Seattle 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 Seattle to Costa Rica.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle 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 Seattle 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 Seattle 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 Seattle 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 Seattle 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 in the afternoon, when round-trip flights cost $658 on average. Morning departures are around 2% more expensive than evening flights, on average. The most expensive time of day to fly to Costa Rica is generally in the morning, which is peak travel time and where the average cost of a ticket is $693.

Top tips for finding cheap flights to Costa Rica

  • One of the most common trips for people traveling from Seattle-Tacoma International Airport (SEA) to Costa Rica is to fly to Liberia Airport (LIR). On this route, you will find one-stop service aboard both United Airlines and American Airlines. If you are looking for a cheaper option on this route, consider one of the two-stop options aboard American Airlines.
  • Another popular destination for travelers making the trip from Seattle to Costa Rica is to fly to the San José Juan Santamaria International Airport (SJO). On this route, you will find one-stop service aboard Delta Airlines, United Airlines, American Airlines, and Spirit Airlines.
  • If you're looking for a way to get to the Seattle-Tacoma International Airport without having to drive your car, a good choice would be to take the King County Metro bus line 124, which makes the trip from downtown Seattle to the airport in around 45min.
  • A very quiet and comfortable place to wait for your flight to Costa Rica at the Seattle-Tacoma International Airport is at one of The Club SEA locations at the airport. There are also airline lounges available from United Airlines, Delta Airlines, and Alaska Airlines, as well as a Centurion Lounge at this airport.
  • If you are looking for a great way to get refreshed after a long flight from Seattle to Costa Rica, the San José Juan Santamaria International Airport offers showers in the terminal building for use by travelers after long trips.

Reviews of the top 5 airlines serving from Seattle to Costa Rica

 
Need help choosing which airline to fly with from Seattle 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
Alaska AirlinesOverall score based on 10000 reviews
8.5Crew
7.8Comfort
7.1Food
7.1Entertainment
8.1Boarding
Airline reviews

Flight attendant was excellent, pleasant and attentive. Announcements were clear and pleasant.

10.0 ExcellentAnonymous, Jul 2025SEA - JAC
Read more Alaska Airlines reviews

Flight attendant was excellent, pleasant and attentive. Announcements were clear and pleasant.

seats good, foot space comfortable not good, waiting on tormack at Las Vegas

6 hour flight from Seattle to Dulles airport without any WiFi and movies, as well as now snacks is crazy. We were told no WiFi and entertainment 5 hours before departure.

Wifi would be nice. Unfortunately the particular airplane was not equipped with wifi.

I'm so glad that Alaska still keeps this little "puddle-jumper" route going between SEA>ALW; my daughter lives on Walla Walla, and it's so much quicker to be able to fly right in to Walla Walla than to have to fly into Tri-Cities and then make her drive 40 minutes each way. This flight is usually only 50%-75% full when I fly it, but that's because it doesn't get in to ALW until MIDNIGHT! But thanks for continuing to service the Walla Walla area, Alaska!

Seats very comfortable and legroom appreciated. All in all, it was a great experience.

Original flight was canceled, and the automatically booked second flight was immediately delayed. I arrived about 4 hours later than planned with only a $12 meal voucher that didn't fully cover a sandwich at airport prices.

I was expecting better service from Alaska Airlines. I registered for assistance since I have a disability. The terminal in Seattle, WA was very unprofessional and at times rude. The BWI location was the exact opposite. I will NOT consider Alaska Airlines for future flights.

It was very good and comfortable, Crew was also great

The flight was delayed almost an hour. No wifi on flight.

Very late arrival at PWM. Late jet getting to ATL. Equipment problem with aircraft - could not get enough water onto plane., Another delay getting FAA approval for flight with bottled H2O. Not the crew’s problem.

Everything was fine except the entertainment was not working for half of the flight.

Easy boarding with an extremely kind attendant. Seats were spacious and we had 3 seats for 2 people so we could stretch out. Comfortable air flow and very attentive and hospital attendants. Bathrooms and food were the only negative. Bathrooms were so small you could hardly get in and close the door. I don’t think an obese person would fit or a person with a movement disability. Food was the trending food for flights, nonexistent. We spent $40 getting sandwich and snack at airport for our 6 hour flught.

At first, we were on the runway for about an hour, literally. The Captain did explain that the Control Tower just had a change shift (sounds like an unrealistic excuse) and then that we had to change a runway. A regular economy seat is made for 12 yo twiggy. I understand Delta wants to push for an upgrade, but after sitting in a Comfort seat and in First class. I would say First class is not worthy of my money. The landing was delayed because of the weather in NYC, I don't hold that against Delta, of course. The Captain did alert us to that upon takeoff in Vegas and again as we reached NY.

No one fussed at me about my pap machine as a 3rd pice on the plane. Boarding was pleasant and smooth. The boarding agent in Anchorage was a fun character- he could be in a movie. :~) The on-board crew were downright pleasant. No militant attitudes on Delta. Like all planes these days the seats are too narrow for standard Americans and at 5’2” there is barely enough leg room. I don’t know how tall people fold themselves into the seats. But that’s nothing specific to Delta

Great. Very smooth. Plenty of information. However, wish they would give out a menu in advance of making a dinner choice like other international airlines. The flight attendant says chicken or pasta and there are details about ingredients or spices requiring the passenger to ask which requires the flight attendant to answer many times. So easy to solve this problem. P

I'm a tall guy and even the seats with more leg room were not as comfortable as I had hoped.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.

After all the weather issues at least they got me to my destination the next day

It was good in general. The Crew during the flight were very nice at all times.

The ground staff were not as friendly and nice to the passengers as the air crew. Flight attendants, cockpit crew were great and very nice to everyone on board.

My wife's entertainment system did not work. Payed for flight upgrade but did not receive advertised "free WiFi".

the guy in front of me put his seat back immediately...and then left it back including thru landing and taxiing to the runway. attendants did not check/ask him to put it up for landing.

Lousy No wheelchair. As normal at Atlanta Cheap airline Cheap aero plane. - Neither entertainment nor food on a 5 hour saga

The airplane was an old airplane, seats were very uncomfortable and very little space, they changed my seat and that was no option to get back into my seat even when I was traveling a senior who required assistance.

Ok. But we arrived to a remote terminal which meant that a bus had to take us to the terminal building

Terrible. The flight arrives 2 hr later, no AC. One of the worst flights ever

The plane was so outdated, that it made it uncomfortable. The temperature was hot during the whole flight

Happy attentive flight crew. All in all good flight the night flight works well. Getting into Mexico City early so you don't get caught up it all the immigration and custom ques, additionally, this helps when exiting the airport and crossing the city to your final destination. All works very well and would do it again

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

The food should improve! And The flight should leave on time and not make the traveler wait.

It was great, I’m very grateful for the pilots and crew flight attendants for everything.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

A little bit more leg room in premium economy. I am 6’4”.

Overall it was good. I missed my connection but I was put on another flight.

The attendant were friendly. I suggest you have a medical attendant on board every flight so that in case someone is sick , he/she will help them.

The woman gate agent in Phoenix was none too sympathetic about my check-in process as I am relatively new with using apps. I almost did not get on because she said I did not check-in. I thought I had via Kayak where I purchased a very expensive ticket. Lesson learned but to be told I may not get on as a matter of factly was difficult to hear.

Overall a very poor experience - booked premium economy tickets but due to last minute flight delays , all my itinery went for a toss and had to fly economy class with no access to lounge or any compensation by united airlines to make up for the flight delays . i had expected better experience than that from united.

We love united ! We would like to acknowledge Aimee in the lounge near gate 130

After a two hour delay, my flight was CANCELLED! No pilot available. Such BS.

Overall very good, only complaint I have is the crew from CLT to SAT could have collected trash sooner.

The AA app really sucks ... Every flight & connecting flights were delayed over 30 mins. One connecting flight on American Eagle said it was delayed in its arrival ... when it was actually parked across from the gate for over 1 hr before they pulled it to the gate. Seats in the economy/ main cabin are packed together like sardines ... no leg room.

Initial flight was cancelled at the time of arrival to the airport, flight alternative requires switching from direct to flight with a layover, and the plane felt like it would split apart, it was so rattle-y.

Amazing food, great staff, with one noticable detail missing ...but no seat entertainment in any of aircraft ...I am not a fan

Flight was delayed again and again ultimately almost three hours getting us to our location at close to midnight by the time we got in and out of airport to destination. I had taken time off work to enjoy an evening at destination and that was now wasted

AA re-routed flight from HNL to LAX due to delay. My group of 3 with reserved seats in row 9 was broken up, with one assigned to a middle seat, another in the last row of the plane. Not happy. No explanation to the delay. No apologies. No compensation. Would have been nice to be offered an Admiral Club admission or a voucher for the extra 3 hours of layover in LAX. Could not hear the boarding gate announcements in LAX. Adjacent gate was boarding at the same time. Loud speakers were competing against each other. Barely made my boarding group.

Boarding gate in Honolulu was staffed with a great clerk with a soothing voice despite the flight delay of over an hour. Flight attendants in the plane were all grumpy, not pleasant looking bunch. Their sour attitude showed throughout the flight. Inly able to get a select few movies started. Most of the movie links in the “free entertainment” did not work.

Above and beyond effort from this crew in a tough situation. So helpful and understanding. Thank you!

The flight delay in Dallas created a domino effect that impacted all of the connecting flights. It also increased the number of connections. I missed my flight from Casablanca to Marrakech because of the tight turnaround when landing in Casablanca. . CMN airport was understaffed. Only one person could help while other employees were just watching him. It was an extremely frustrating situation. People were crying and slamming their palms on the counter when speaking to the customer service provider, Allabough (man’s name?). Allabough couldn’t change my flight in the system. simultaneously, I was on the call with America. Airlines customer service rep named Solomon that said he couldn’t change it either. So, I took a ONYA voyages train to from Casablanca to Marrakech to get there on Friday June 26. This was unpredictable trip.

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