HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Costa Rica

$154+ Cheap flights from Dulles Intl (IAD) to Costa Rica

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SJO
ago. 16 — ago. 231
dom. 8/16
dom. 8/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to Costa Rica with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Dulles Intl to Costa Rica

Cheapest flights from Dulles Intl to Costa Rica
Explore the most affordable flight options available from Dulles Intl to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 17, 2026.

This United Airlines deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/710:10 pm
IAD
-
LIR
1 stop14h 34m
United Airlines
jue. 12/105:15 pm
LIR
-
IAD
1 stop13h 04m
United Airlines
Deal found 7/13$340
This American Airlines deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/148:22 pm
IAD
-
LIR
2 stops18h 53m
American Airlines
vie. 7/172:47 pm
LIR
-
IAD
2 stops16h 02m
American Airlines
Deal found 7/13$345
This American Airlines deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/74:58 pm
IAD
-
LIR
2 stops21h 52m
American Airlines
jue. 12/103:10 pm
LIR
-
IAD
1 stop30h 33m
American Airlines
Deal found 7/13$353
This United Airlines deal was found by Cheapflights users on 7/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/256:00 am
IAD
-
LIR
1 stop8h 10m
United Airlines
dom. 11/18:45 am
LIR
-
IAD
1 stop12h 58m
United Airlines
Deal found 7/17$356
This Delta deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/256:00 am
IAD
-
LIR
1 stop8h 00m
Delta
vie. 9/41:25 pm
LIR
-
IAD
1 stop9h 09m
Delta
Deal found 7/16$360
This United Airlines deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/810:10 pm
IAD
-
LIR
1 stop14h 34m
United Airlines
mié. 12/165:15 pm
LIR
-
IAD
1 stop13h 04m
United Airlines
Deal found 7/13$364
This United Airlines deal was found by Cheapflights users on 7/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/76:00 am
IAD
-
LIR
1 stop13h 37m
United Airlines
jue. 12/172:00 pm
LIR
-
IAD
Nonstop4h 35m
United Airlines
Deal found 7/14$366
This American Airlines deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/24:40 pm
IAD
-
LIR
2 stops20h 45m
American Airlines
mié. 12/93:10 pm
LIR
-
IAD
2 stops21h 10m
American Airlines
Deal found 7/13$371
This American Airlines deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/66:38 pm
IAD
-
LIR
1 stop21h 00m
American Airlines
mar. 9/152:47 pm
LIR
-
IAD
2 stops21h 31m
American Airlines
Deal found 7/16$373
This United Airlines deal was found by Cheapflights users on 7/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/110:18 pm
IAD
-
LIR
1 stop15h 52m
United Airlines
sáb. 10/311:20 pm
LIR
-
IAD
1 stop9h 12m
United Airlines
Deal found 7/17$375
This Delta deal was found by Cheapflights users on 7/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/296:00 am
IAD
-
LIR
1 stop8h 00m
Delta
jue. 9/31:25 pm
LIR
-
IAD
1 stop9h 09m
Delta
Deal found 7/14$376
This American Airlines deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/252:53 pm
IAD
-
SJO
2 stops23h 10m
American Airlines
sáb. 8/296:00 am
SJO
-
IAD
2 stops24h 41m
American Airlines
Deal found 7/13$381

Find flight deals from Dulles Intl to Costa Rica

Keep the following information in mind while searching for Dulles Intl to Costa Rica flight deals. Data was last updated julio 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$340
(United Airlines)

One-way from

$154
(American Airlines)

Popular in

December

Cheapest in

October

Average price

$499

Good round-trip deal

$652 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-San José Juan Santamaria Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-San José Juan Santamaria Intl flights.
Search Deals
From Washington, D.C. Dulles Intl to Costa Rica
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Costa Rica
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Costa Rica.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl 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, Cheapflights users made 2,558,603 searches. Data last updated julio 17, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Costa Rica that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

jue. 10/1

10:18 pm-12:10 pm

1 stop15h 52m

Liberia

sáb. 10/31

1:20 pm-12:32 am

1 stop9h 12m

$375

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

jue. 7/23

6:30 am-2:25 pm

1 stop9h 55m

Liberia

mié. 7/29

4:30 pm-7:22 am

1 stop12h 52m

$390
Quickest round-trip

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

lun. 8/3

2:25 am-9:04 am

1 stop8h 39m

San José Juan Santamaria Intl

lun. 8/10

5:55 pm-4:21 am

1 stop8h 26m

$419

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

vie. 7/31

4:26 pm-7:10 am

1 stop16h 44m

San José Juan Santamaria Intl

lun. 8/3

5:55 pm-4:21 am

1 stop8h 26m

$425

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

jue. 7/23

4:26 pm-7:12 am

1 stop16h 46m

San José Juan Santamaria Intl

sáb. 8/1

5:55 pm-4:21 am

1 stop8h 26m

$440

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

jue. 7/23

4:26 pm-7:12 am

1 stop16h 46m

San José Juan Santamaria Intl

mié. 7/29

8:45 am-4:21 am

1 stop17h 36m

$440

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

jue. 10/1

10:18 pm-12:10 pm

1 stop15h 52m

Liberia

jue. 10/8

1:20 pm-12:30 am

1 stop9h 10m

$573

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

jue. 9/24

10:18 pm-12:10 pm

1 stop15h 52m

Liberia

lun. 9/28

1:20 pm-12:30 am

1 stop9h 10m

$591

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

mié. 9/2

10:29 pm-12:10 pm

1 stop15h 41m

Liberia

dom. 9/6

1:20 pm-12:30 am

1 stop9h 10m

$642

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

vie. 7/31

6:30 am-12:10 pm

1 stop7h 40m

Liberia

mié. 8/5

11:49 am-5:27 am

1 stop15h 38m

$694

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/12

Showing 1-10 of 41 resultsSorted by cheapest first
1
2
3
...
5

Best time to book a flight from Dulles Intl to Costa Rica

Have a flexible travel schedule? Discover the best time to fly to Costa Rica from Dulles Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Costa Rica

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Costa Rica?

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Costa Rica (average of $109). Flying from Washington, D.C. Dulles Intl Airport to Costa Rica in June is currently the most expensive (average of $286). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to CR?

Find hourly flight availability from Dulles Intl to Costa Rica. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 17, 2026.

When flying from Washington, D.C. Dulles Intl Airport to Costa Rica, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Costa Rica?

Booking 4 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. Dulles Intl Airport to Costa Rica. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing Costa Rica

Get insights into the airlines that provide service to Costa Rica. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Costa Rica. Reviews last updated julio 17, 2026.
See what other customers who have flown with Delta,Copa Airlines, andUnited Airlines from Washington, D.C. Dulles Intl Airport to Costa Rica have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,476 reviews

Crew

8.5

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.8

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.8
Good
8,476 reviews
Delta
7.8
Good
8,476 reviews

Crew

8.5

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.8

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Copa Airlines
7.6
Good
1,564 reviews
Delta
7.8
Good
8,476 reviews

Crew

8.5

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.8

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
10,006 reviews
Delta
7.8
Good
8,476 reviews

Crew

8.5

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.8

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
American Airlines
7.1
Good
11,829 reviews
Delta
7.8
Good
8,476 reviews

Crew

8.5

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.8

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Avianca
6.5
Okay
2,526 reviews
Delta
7.8
Good
8,476 reviews

Crew

8.5

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.8

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Costa Rica. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Costa Rica?

    For as low as $419, United Airlines can have you in Costa Rica from Washington, D.C. Dulles Intl Airport in 8h 39m. There are 2042 mi between Washington, D.C. Dulles Intl Airport and Costa Rica. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Costa Rica one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $101. Users have also found prices from $107 and $109 on Avianca and Copa Airlines, respectively.

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Costa Rica?

    On average you can expect to pay $1,421 for a flight from Washington, D.C. Dulles Intl Airport to Costa Rica. The cheapest flight overall is $351 while the most popular route, (Washington, D.C. Dulles Intl - San José Juan Santamaria Intl) is currently priced at $346.

  • Can I find deals for flights from Dulles Intl to Costa Rica that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Costa Rica flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Costa Rica?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Costa Rica.

  • Can I find deals for business class flights from Dulles Intl to Costa Rica?

    Yes. Cheapflights offers flight deals from Dulles Intl to Costa Rica by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Costa Rica?

    Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Costa Rica (average of $109). Flying from Washington, D.C. Dulles Intl Airport to Costa Rica in June is currently the most expensive (average of $286). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 5 airlines flying from Dulles Intl to Costa Rica

Discover the top 5 airlines that operate flights from Dulles Intl to Costa Rica. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$186Average$490FlexibilityNo cancel feeOn-timeN/A
Copa AirlinesCheapest$201Average$370FlexibilityNo cancel feeOn-time70%
AviancaCheapest$236Average$394FlexibilityNo cancel feeOn-time71%
American AirlinesCheapest$240Average$507FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$248Average$545FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.