HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Juan

$125+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SJU
Jan 27 — Feb 31
Mon 1/27
Mon 2/3
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to San Juan 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.

The best prices from Washington, D.C. Dulles Intl to San Juan are usually found in September or October, booked 37 days in advance, depart on a Tuesday or Monday and return on a Friday

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 January 22, 2025.

Round-trip from

$178
(Mytrip)

One-way from

$125
(United Airlines)

Popular in

December

Cheapest in

September

Average price

$415
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. 4% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2025
Search Deals

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 January 22, 2025.

This Mytrip deal was found by Cheapflights users on 1/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/237:31 pmIAD - SJU
1 stop6h 23mFrontier
Wed 2/269:30 pmSJU - IAD
1 stop20h 33mFrontier
Deal found 1/21$178
This United Airlines deal was found by Cheapflights users on 1/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/38:30 amIAD - SJU
Nonstop3h 47mUnited Airlines
Wed 3/58:10 amSJU - IAD
Nonstop4h 00mUnited Airlines
Deal found 1/21$184
This American Airlines deal was found by Cheapflights users on 1/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/289:11 amIAD - SJU
1 stop11h 56mAmerican Airlines
Thu 2/612:35 pmSJU - IAD
1 stop12h 23mAmerican Airlines
Deal found 1/21$214
This Delta deal was found by Cheapflights users on 1/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/112:05 pmIAD - SJU
1 stop10h 54mDelta
Wed 2/53:23 pmSJU - IAD
1 stop8h 50mDelta
Deal found 1/22$259

Find flights from Dulles Intl to San Juan within your budget

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 January 22, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sun 2/23

7:31 pm-2:54 am

1 stop6h 23m

San Juan Luis Munoz Marin Intl

Wed 2/26

9:30 pm-5:03 pm

1 stop20h 33m

$178

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sat 3/1

5:35 pm-10:22 pm

Nonstop3h 47m

San Juan Luis Munoz Marin Intl

Thu 3/6

3:46 pm-11:48 pm

1 stop9h 02m

$189

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Mon 2/3

6:22 am-9:38 pm

1 stop14h 16m

San Juan Luis Munoz Marin Intl

Fri 2/7

8:05 am-11:58 pm

1 stop16h 53m

$214

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Mon 2/17

6:00 am-5:07 pm

1 stop10h 07m

San Juan Luis Munoz Marin Intl

Wed 2/19

6:15 am-12:45 pm

1 stop7h 30m

$297

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Mon 3/3

5:40 pm-4:27 pm

3 stops21h 47m

San Juan Luis Munoz Marin Intl

Wed 3/12

5:45 pm-11:26 am

3 stops17h 41m

$318

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Tue 3/4

8:30 am-1:17 pm

Nonstop3h 47m

$125

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Wed 2/19

6:03 pm-12:22 am

2 stops29h 19m

$126

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sat 2/1

12:05 pm-11:59 pm

1 stop10h 54m

$130

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Mon 3/3

5:40 pm-4:27 pm

3 stops21h 47m

$143

Washington, D.C.San Juan

IAD - SJU

IADSJU

Washington, D.C. Dulles Intl

Sun 3/16

5:28 pm-10:45 am

1 stop17h 17m

$155

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/22

Showing 1-10 of 13 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.

Travel insights for flights from Dulles Intl to San Juan

Get recent, data-driven insights about flights from Dulles Intl to San Juan including ideal travel times, pricing trends, and more.

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 January 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 37 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, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Juan (average of $254). Flying from Washington, D.C. Dulles Intl Airport to San Juan in March is currently the most expensive (average of $375). 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 January 22, 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 56% on the flight price compared to flying in the morning, 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 September 29, 2024.

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

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 January 22, 2025.

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).

Rainfall in San Juan by month

Plan your trip to San Juan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit San Juan when rainfall is around 2.2 in.

Temperature in San Juan by month

Plan your trip to San Juan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

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 January 22, 2025.
Read reviews from past customers who have flown Frontier, United Airlines and American Airlines from Washington, D.C. to San Juan. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,654 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,654 reviews
Southwest
8.1
Very good
4,654 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,707 reviews
Southwest
8.1
Very good
4,654 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,512 reviews
Southwest
8.1
Very good
4,654 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,975 reviews
Southwest
8.1
Very good
4,654 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,654 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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.

  • 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 $178 on this airline. Additional options worth looking into are United Airlines and American Airlines, starting at $205 and $214 round-trip. Frontier is priced at 63% 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 United Airlines, with whom users have recently found tickets for as low as $125. However, be on the lookout for offers from Frontier and Delta, 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 (70%), United Airlines (70%), Brussels Airlines (59%).

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

    On average you can expect to pay $1,001 for a flight from Washington, D.C. Dulles Intl Airport to San Juan. The cheapest flight overall is $149 while the most popular route, (Washington, D.C. Dulles Intl - San Juan Luis Munoz Marin Intl) is currently priced at $128.

  • 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, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to San Juan (average of $254). Flying from Washington, D.C. Dulles Intl Airport to San Juan in March is currently the most expensive (average of $375). 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 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 January 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$115Average$211FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$124Average$264FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$203Average$386FlexibilityNo cancel feeOn-time62%
DeltaCheapest$238Average$387FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$266Average$844FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$301Average$518FlexibilityNo 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.