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$83+ Cheap flights from Dulles Intl (IAD) to San Juan

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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SJU
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to San Juan are usually found in June or October, booked 90 days in advance, depart on a Tuesday or Sunday and return on a Thursday

Find flight deals from Dulles Intl to San Juan

Cheapest flights from Dulles Intl to San Juan
Explore the most affordable flight options available from Dulles Intl to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2025.

This Frontier deal was found by Cheapflights users on 10/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/36:00 amIAD - SJU
1 stop8h 19mFrontier
Thu 11/133:45 pmSJU - IAD
Nonstop3h 56mFrontier
Deal found 10/20$184
This Frontier deal was found by Cheapflights users on 10/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/242:11 pmIAD - SJU
1 stop7h 58mFrontier
Thu 12/46:30 amSJU - IAD
Nonstop4h 13mFrontier
Deal found 10/20$187
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/710:38 amIAD - SJU
Nonstop3h 54mFrontier
Thu 12/1110:42 amSJU - IAD
1 stop29h 23mFrontier
Deal found 10/21$189
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/238:06 pmIAD - SJU
Nonstop3h 47mFrontier
Thu 12/46:30 amSJU - IAD
Nonstop4h 13mFrontier
Deal found 10/20$191
This Frontier deal was found by Cheapflights users on 10/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/24:04 pmIAD - SJU
1 stop8h 28mFrontier
Thu 11/63:45 pmSJU - IAD
Nonstop3h 56mFrontier
Deal found 10/22$192
This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/18:06 pmIAD - SJU
Nonstop3h 47mFrontier
Thu 12/46:30 amSJU - IAD
Nonstop4h 13mFrontier
Deal found 10/23$195
This Frontier deal was found by Cheapflights users on 10/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:26 pmIAD - SJU
Nonstop3h 52mFrontier
Thu 11/133:45 pmSJU - IAD
Nonstop3h 56mFrontier
Deal found 10/21$197
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/85:58 amIAD - SJU
2 stops25h 47mFrontier
Thu 11/133:45 pmSJU - IAD
Nonstop3h 56mFrontier
Deal found 10/21$198
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/118:40 amIAD - SJU
2 stops41h 53mFrontier
Thu 11/133:45 pmSJU - IAD
Nonstop3h 56mFrontier
Deal found 10/21$201
This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/176:00 amIAD - SJU
1 stop8h 19mFrontier
Mon 11/244:08 pmSJU - IAD
Nonstop4h 03mFrontier
Deal found 10/23$203
This Frontier deal was found by Cheapflights users on 10/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/134:00 pmIAD - SJU
1 stop8h 32mFrontier
Sun 11/234:08 pmSJU - IAD
Nonstop4h 03mFrontier
Deal found 10/21$204

Cheap flight deals from Dulles Intl to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to San Juan (PR1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 23, 2025.

Round-trip from

$184
(Frontier)

One-way from

$83
(Kiwi.com)

Popular in

April

Cheapest in

June

Average price

$330
From Washington, D.C. Dulles Intl to San Juan
Search Deals
One-way flight from Washington, D.C. Dulles Intl to San Juan
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($55 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to San Juan 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 October 23, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to San Juan that are best for you.

Fly from

Dulles Intl

Fly to

San Juan

Route

Depart

Return

Price

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Tue 11/11

12:11 pm-11:56 pm

1 stop10h 45m

San Juan Luis Munoz Marin Intl

Sat 12/6

7:00 am-2:40 pm

1 stop8h 40m

$247

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sun 11/2

7:05 am-5:33 pm

1 stop9h 28m

San Juan Luis Munoz Marin Intl

Tue 11/11

3:32 pm-9:32 pm

1 stop7h 00m

$295

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sat 11/1

6:00 am-4:33 pm

1 stop10h 33m

San Juan Luis Munoz Marin Intl

Wed 11/12

6:36 pm-12:16 am

1 stop6h 40m

$304

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Tue 11/4

6:00 am-4:36 pm

1 stop9h 36m

San Juan Luis Munoz Marin Intl

Wed 11/12

5:50 pm-8:55 pm

Nonstop4h 05m

$305

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Tue 11/11

5:32 pm-10:22 pm

Nonstop3h 50m

San Juan Luis Munoz Marin Intl

Sat 12/6

8:10 am-4:00 pm

1 stop8h 50m

$305

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sat 11/1

6:00 am-4:33 pm

1 stop10h 33m

San Juan Luis Munoz Marin Intl

Wed 11/5

7:15 am-4:57 pm

1 stop10h 42m

$305

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Mon 11/3

8:27 am-1:17 pm

Nonstop3h 50m

San Juan Luis Munoz Marin Intl

Thu 11/6

5:50 pm-8:55 pm

Nonstop4h 05m

$315

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Tue 10/28

6:30 am-2:40 pm

1 stop8h 10m

San Juan Luis Munoz Marin Intl

Thu 10/30

4:50 pm-8:55 pm

Nonstop4h 05m

$360

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sun 1/18

5:32 pm-10:22 pm

Nonstop3h 50m

San Juan Luis Munoz Marin Intl

Tue 1/20

5:50 pm-8:55 pm

Nonstop4h 05m

$380

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sat 11/8

5:32 pm-10:22 pm

Nonstop3h 50m

San Juan Luis Munoz Marin Intl

Wed 11/12

8:30 am-11:35 am

Nonstop4h 05m

$380

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/22

Showing 1-10 of 20 results
1
2

Best time to book a flight from Dulles Intl to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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 San Juan

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

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to San Juan. Price data was last updated on October 17, 2025.

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to San Juan may vary depending on when you book. For the best chance of a lower fare, look to book 90 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, June is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Juan (average of $86). Flying from Washington, D.C. Dulles Intl Airport to San Juan in September is currently the most expensive (average of $272). 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 SJU?

Find hourly flight availability from Dulles Intl to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 23, 2025.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to San Juan in the evening. Doing so could potentially save you 31% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to San Juan?

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to San Juan. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to San Juan flight should consider departing on Wednesday at noon when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to San Juan?

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated October 23, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from Washington, D.C. Dulles Intl Airport to San Juan. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,982 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

7.9

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,982 reviews
Delta
7.9
Good
7,982 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

7.9

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,995 reviews
Delta
7.9
Good
7,982 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

7.9

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
American Airlines
7.2
Good
11,033 reviews
Delta
7.9
Good
7,982 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

7.9

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Spirit Airlines
6.3
Okay
8,103 reviews
Delta
7.9
Good
7,982 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

7.9

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Frontier
5.8
Fair
3,128 reviews
Delta
7.9
Good
7,982 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Boarding

8.2

Overall

7.9

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to San Juan. 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 San Juan?

    Departing from Washington, D.C. Dulles Intl Airport to San Juan will take you 9h 36m. Washington, D.C. Dulles Intl Airport and San Juan are separated by a distance of 1573 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to San Juan round-trip?

    Our cheapest airline available from Washington, D.C. Dulles Intl Airport to San Juan is Frontier. Our recent data shows that you can find tickets from as low as $115 on this airline. Additional options worth looking into are Spirit Airlines and American Airlines, starting at $135 and $145 round-trip. Frontier is priced at 72% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to San Juan?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to San Juan on time: Brussels Airlines (100%), Air Canada (92%), United Airlines (92%).

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

    On average you can expect to pay $1,030 for a flight from Washington, D.C. Dulles Intl Airport to San Juan. The cheapest flight overall is $69 while the most popular route, (Washington, D.C. Dulles Intl - San Juan Luis Munoz Marin Intl) is currently priced at $165.

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

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

  • How can I find direct flights from Dulles Intl to San Juan?

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

  • Can I find deals for business class flights from Dulles Intl to San Juan?

    Yes. Cheapflights offers flight deals from Dulles Intl to San Juan 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 San Juan?

    Currently, June is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Juan (average of $86). Flying from Washington, D.C. Dulles Intl Airport to San Juan in September is currently the most expensive (average of $272). 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

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Top 6 airlines flying from Dulles Intl to San Juan

Discover the top 6 airlines that operate flights from Dulles Intl to San Juan. 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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$115Average$258FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$135Average$288FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$145Average$489FlexibilityNo cancel feeOn-time71%
DeltaCheapest$158Average$356FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$161Average$386FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$275Average$500FlexibilityNo cancel feeOn-time69%

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