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$130+ 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SJO
Aug 11 — Aug 181
Tue 8/11
Tue 8/18
1 adult, Economy
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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 July 12, 2026.

This United Airlines deal was found by Cheapflights users on 7/8. 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.
Tue 10/276:30 am
IAD
-
LIR
1 stop10h 40m
United Airlines
Tue 11/35:20 pm
LIR
-
IAD
1 stop13h 15m
United Airlines
Deal found 7/8$276
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Sat 9/510:29 pm
IAD
-
LIR
1 stop15h 41m
United Airlines
Thu 9/101:20 pm
LIR
-
IAD
1 stop9h 10m
United Airlines
Deal found 7/7$288
This American Airlines deal was found by Cheapflights users on 7/8. 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.
Fri 9/114:56 pm
IAD
-
LIR
2 stops22h 22m
American Airlines
Mon 9/142:18 pm
LIR
-
IAD
2 stops26h 41m
American Airlines
Deal found 7/8$305
This American Airlines deal was found by Cheapflights users on 7/8. 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.
Thu 9/106:41 pm
IAD
-
LIR
2 stops20h 37m
American Airlines
Sun 9/132:18 pm
LIR
-
IAD
2 stops26h 41m
American Airlines
Deal found 7/8$310
This American Airlines deal was found by Cheapflights users on 7/7. 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.
Sun 12/64:58 pm
IAD
-
LIR
2 stops21h 52m
American Airlines
Sat 12/123:28 pm
LIR
-
IAD
2 stops20h 52m
American Airlines
Deal found 7/7$311
This American Airlines deal was found by Cheapflights users on 7/8. 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.
Thu 9/106:41 pm
IAD
-
LIR
1 stop21h 06m
American Airlines
Mon 9/142:18 pm
LIR
-
IAD
2 stops26h 41m
American Airlines
Deal found 7/8$312
This American Airlines deal was found by Cheapflights users on 7/9. 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.
Tue 10/277:13 pm
IAD
-
LIR
2 stops20h 05m
American Airlines
Tue 11/31:21 pm
LIR
-
IAD
2 stops18h 20m
American Airlines
Deal found 7/9$334
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Fri 10/1610:40 pm
IAD
-
LIR
1 stop14h 04m
United Airlines
Mon 10/191:20 pm
LIR
-
IAD
1 stop9h 10m
United Airlines
Deal found 7/7$336
This United Airlines deal was found by Cheapflights users on 7/8. 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.
Wed 11/46:00 am
IAD
-
LIR
1 stop8h 10m
United Airlines
Mon 11/98:45 am
LIR
-
IAD
1 stop8h 48m
United Airlines
Deal found 7/8$338
This American Airlines deal was found by Cheapflights users on 7/9. 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.
Tue 7/288:22 pm
IAD
-
SJO
2 stops18h 49m
American Airlines
Tue 8/42:11 pm
SJO
-
IAD
2 stops20h 37m
American Airlines
Deal found 7/9$384
This American Airlines deal was found by Cheapflights users on 7/9. 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.
Thu 7/98:22 pm
IAD
-
SJO
2 stops28h 16m
American Airlines
Tue 7/1412:50 pm
SJO
-
IAD
2 stops20h 17m
American Airlines
Deal found 7/9$385
This Justfly.com deal was found by Cheapflights users on 7/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/163:40 am
IAD
-
SJO
1 stop6h 50m
Avianca
Thu 8/274:35 pm
SJO
-
IAD
1 stop7h 40m
Avianca
Deal found 7/9$386

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 July 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$276
(United Airlines)

One-way from

$130
(American Airlines)

Popular in

December

Cheapest in

October

Average price

$477

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. 10% potential increase in price ($50 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 July 12, 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

Sun 9/6

6:30 am-12:10 pm

1 stop7h 40m

Liberia

Tue 9/15

1:20 pm-11:55 pm

1 stop8h 35m

$340

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

Sat 8/29

6:30 am-12:10 pm

1 stop7h 40m

Liberia

Thu 9/3

1:20 pm-11:28 am

1 stop20h 08m

$378

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

Mon 12/7

7:00 am-1:05 pm

1 stop7h 05m

San José Juan Santamaria Intl

Sat 12/19

3:55 pm-9:49 am

1 stop16h 54m

$451

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

Sat 12/5

6:50 pm-6:25 am

1 stop12h 35m

San José Juan Santamaria Intl

Wed 12/23

12:35 pm-11:51 pm

1 stop10h 16m

$476

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

Sat 7/18

6:20 am-12:10 pm

1 stop7h 50m

Liberia

Thu 7/23

3:27 pm-10:43 pm

1 stop29h 16m

$480

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

Sun 12/6

1:18 am-4:53 pm

1 stop16h 35m

San José Juan Santamaria Intl

Sun 12/13

4:00 am-3:19 am

1 stop22h 19m

$512

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

Tue 12/1

6:00 am-10:15 pm

1 stop17h 15m

San José Juan Santamaria Intl

Mon 12/21

7:00 am-3:11 pm

1 stop7h 11m

$512

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

Sat 12/5

1:00 pm-10:15 pm

1 stop10h 15m

San José Juan Santamaria Intl

Sun 12/20

7:00 am-3:11 pm

1 stop7h 11m

$564

Washington, D.C.Liberia

IAD - LIR

IADLIR

Washington, D.C. Dulles Intl

Sun 8/23

10:29 pm-12:10 pm

1 stop15h 41m

Liberia

Sun 8/30

1:20 pm-12:30 am

1 stop9h 10m

$596

Washington, D.C.San José

IAD - SJO

IADSJO

Washington, D.C. Dulles Intl

Mon 7/27

10:20 pm-10:11 am

1 stop13h 51m

San José Juan Santamaria Intl

Fri 7/31

12:44 pm-11:55 pm

1 stop9h 11m

$620

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/7

Showing 1-10 of 44 resultsSorted by cheapest first
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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 July 12, 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 July 12, 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
8,457 reviews

Food

7.2

Comfort

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

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
8,457 reviews
Delta
7.8
Good
8,457 reviews

Food

7.2

Comfort

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

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
1,561 reviews
Delta
7.8
Good
8,457 reviews

Food

7.2

Comfort

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

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
9,981 reviews
Delta
7.8
Good
8,457 reviews

Food

7.2

Comfort

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

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
11,805 reviews
Delta
7.8
Good
8,457 reviews

Food

7.2

Comfort

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

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
2,521 reviews
Delta
7.8
Good
8,457 reviews

Food

7.2

Comfort

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

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 $451, United Airlines can have you in Costa Rica from Washington, D.C. Dulles Intl Airport in 7h 05m. 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 $523 while the most popular route, (Washington, D.C. Dulles Intl - San José Juan Santamaria Intl) is currently priced at $330.

  • 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

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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 July 12, 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%

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