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$146+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SJU
Aug 10 — Aug 171
Mon 8/10
Mon 8/17
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 February or October, booked 57 days in advance, depart on a Sunday or Monday and return on a Thursday

Cheap 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 July 11, 2026.

This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/36:09 pm
IAD
-
SJU
1 stop21h 56m
Frontier
Thu 8/69:02 am
SJU
-
IAD
2 stops13h 50m
Frontier
Deal found 7/9$312
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/712:28 pm
IAD
-
SJU
1 stop12h 13m
Frontier
Sun 8/93:10 am
SJU
-
IAD
1 stop7h 15m
Frontier
Deal found 7/9$314
This Kiwi.com deal was found by Cheapflights users on 7/10. 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.
Thu 8/65:40 pm
IAD
-
SJU
1 stop22h 31m
Frontier
Mon 8/1010:48 pm
SJU
-
IAD
1 stop13h 59m
Frontier
Deal found 7/10$315
This American Airlines deal was found by Cheapflights users on 7/11. 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 7/316:14 am
IAD
-
SJU
1 stop17h 36m
American Airlines
Mon 8/312:58 am
SJU
-
IAD
1 stop10h 09m
American Airlines
Deal found 7/11$316
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:40 pm
IAD
-
SJU
1 stop22h 25m
Frontier
Sat 7/186:00 am
SJU
-
IAD
1 stop13h 38m
Frontier
Deal found 7/8$318
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/276:46 pm
IAD
-
SJU
1 stop19h 14m
Multiple Airlines
Wed 8/53:10 am
SJU
-
IAD
1 stop9h 37m
Multiple Airlines
Deal found 7/9$319
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:16 pm
IAD
-
SJU
2 stops27h 00m
Frontier
Wed 10/215:12 pm
SJU
-
IAD
1 stop27h 09m
Frontier
Deal found 7/7$320
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.
Sat 8/297:57 am
IAD
-
SJU
1 stop15h 46m
American Airlines
Wed 9/23:47 pm
SJU
-
IAD
1 stop7h 08m
American Airlines
Deal found 7/8$321
This Kiwi.com deal was found by Cheapflights users on 7/6. 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 7/115:29 pm
IAD
-
SJU
1 stop22h 36m
Frontier
Sat 7/186:00 am
SJU
-
IAD
1 stop13h 38m
Frontier
Deal found 7/6$322
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:40 pm
IAD
-
SJU
1 stop22h 25m
Frontier
Wed 7/296:00 am
SJU
-
IAD
1 stop13h 38m
Frontier
Deal found 7/7$323

Find 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 July 11, 2026.

Round-trip from

$312
(Kiwi.com)

One-way from

$146
(American Airlines)

Popular in

December

Cheapest in

February

Average price

$481
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. 1% potential increase in price ($5 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in July 2026
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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 July 11, 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sun 8/23

9:00 am-12:54 pm

Nonstop3h 54m

San Juan Luis Munoz Marin Intl

Fri 8/28

4:55 pm-8:47 pm

Nonstop3h 52m

$357

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Mon 8/24

6:16 am-1:45 pm

1 stop7h 29m

San Juan Luis Munoz Marin Intl

Mon 8/31

4:55 pm-8:47 pm

Nonstop3h 52m

$362

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Thu 9/10

9:00 am-12:54 pm

Nonstop3h 54m

San Juan Luis Munoz Marin Intl

Sun 9/13

1:00 am-7:19 am

1 stop6h 19m

$386

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Wed 9/30

6:15 am-3:42 pm

1 stop9h 27m

San Juan Luis Munoz Marin Intl

Sun 10/4

4:55 pm-8:47 pm

Nonstop3h 52m

$386

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Thu 8/27

9:00 am-12:54 pm

Nonstop3h 54m

San Juan Luis Munoz Marin Intl

Sun 8/30

1:00 am-7:19 am

1 stop6h 19m

$387

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sat 8/1

5:24 pm-9:24 pm

Nonstop4h 00m

San Juan Luis Munoz Marin Intl

Tue 8/4

7:20 am-11:21 am

Nonstop4h 01m

$415

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Mon 8/17

9:00 am-12:54 pm

Nonstop3h 54m

San Juan Luis Munoz Marin Intl

Tue 8/25

4:55 pm-8:47 pm

Nonstop3h 52m

$447

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Tue 7/28

8:34 am-12:34 pm

Nonstop4h 00m

San Juan Luis Munoz Marin Intl

Tue 8/4

4:55 pm-8:56 pm

Nonstop4h 01m

$447

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sun 8/23

9:00 am-12:54 pm

Nonstop3h 54m

San Juan Luis Munoz Marin Intl

Sat 8/29

1:00 am-7:19 am

1 stop6h 19m

$452

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Wed 8/26

12:49 pm-11:50 pm

2 stops11h 01m

San Juan Luis Munoz Marin Intl

Tue 9/1

1:25 pm-9:28 pm

1 stop8h 03m

$456

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/6

Showing 1-10 of 22 resultsSorted by cheapest first
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3

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

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Juan (average of $44). Flying from Washington, D.C. Dulles Intl Airport to San Juan in December is currently the most expensive (average of $1,230). 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 July 11, 2026.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to San Juan at noon. Doing so could potentially save you 44% on the flight price compared to flying in the afternoon, which is usually more expensive.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to San Juan

Explore weekly flight availability from Dulles Intl to San Juan. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 11, 2026.

The most flights from IAD to PR1 are scheduled on a Monday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 on average).

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

How often are flights from Washington, D.C. to San Juan delayed?

About 20% of weekly flights between Washington, D.C. and San Juan have experienced delays in the past year, with the average delay time being 126 minutes.

What is the most punctual flight time for Washington, D.C. to San Juan flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Wednesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Washington, D.C. to San Juan flights?

Over the last year, United Airlines have had the lowest number of delays on this route, with just 17% of flights being delayed.

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

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 56 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 July 11, 2026.
Read reviews from past customers who have flown Delta,United Airlines, andAmerican 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
7.8
Good
8,459 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Overall

7.8

Comfort

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
8,459 reviews
Delta
7.8
Good
8,459 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Overall

7.8

Comfort

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
9,976 reviews
Delta
7.8
Good
8,459 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Overall

7.8

Comfort

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
11,806 reviews
Delta
7.8
Good
8,459 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Overall

7.8

Comfort

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
JetBlue
7.1
Good
3,016 reviews
Delta
7.8
Good
8,459 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Overall

7.8

Comfort

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
Frontier
5.6
Fair
2,832 reviews
Delta
7.8
Good
8,459 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Overall

7.8

Comfort

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 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 3h 54m. Washington, D.C. Dulles Intl Airport and San Juan are separated by a distance of 1573 mi. Most flights are nonstop.

  • 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 $90 on this airline. Additional options worth looking into are Delta and JetBlue, starting at $136 and $161 round-trip. Frontier is priced at 78% lower than the current average price of a flight leaving 3 months from now.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $54. However, be on the lookout for offers from Delta and United Airlines, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to San Juan for a low price.

  • 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: Air Canada (91%), United Airlines (91%), Brussels Airlines (87%).

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

    On average you can expect to pay $732 for a flight from Washington, D.C. Dulles Intl Airport to San Juan. The cheapest flight overall is $178 while the most popular route, (Washington, D.C. Dulles Intl - San Juan Luis Munoz Marin Intl) is currently priced at $272.

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Juan (average of $44). Flying from Washington, D.C. Dulles Intl Airport to San Juan in December is currently the most expensive (average of $1,230). 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 San Juan

Discover the top 5 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 July 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$308FlexibilityNo cancel feeOn-time62%
DeltaCheapest$136Average$323FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$161Average$462FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$225Average$438FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$261Average$485FlexibilityNo cancel feeOn-time69%

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