$68 Cheap Flights from Washington (IAD) to San Juan (SJU)

View $68 flight on Mon, Oct 20, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)

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Cheap Flights from Washington to San Juan (IAD-SJU)

Prices were available within the past 7 days and start at $68 for one-way flights and $136 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Oct 14 - Sat, Oct 18
IAD
Washington
SJU
San Juan
$136 Roundtrip, just found
$136
Roundtrip
just found
Select United flight, departing Tue, Oct 14 from Washington to San Juan, returning Sat, Oct 18, priced at $136 just found
Frontier Airlines
Sat, Aug 23 - Sat, Aug 30
IAD
Washington
SJU
San Juan
$138 Roundtrip, just found
$138
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 23 from Washington to San Juan, returning Sat, Aug 30, priced at $138 just found
Frontier Airlines
Sat, Aug 23 - Thu, Aug 28
IAD
Washington
SJU
San Juan
$141 Roundtrip, just found
$141
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 23 from Washington to San Juan, returning Thu, Aug 28, priced at $141 just found
American Airlines
Wed, Oct 8 - Thu, Oct 16
IAD
Washington
SJU
San Juan
$142 Roundtrip, found 3 hours ago
$142
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Oct 8 from Washington to San Juan, returning Thu, Oct 16, priced at $142 found 3 hours ago
Frontier Airlines
Sat, Aug 23 - Sat, Aug 30
IAD
Washington
SJU
San Juan
$143 Roundtrip, just found
$143
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 23 from Washington to San Juan, returning Sat, Aug 30, priced at $143 just found
American Airlines
Mon, Aug 25 - Fri, Aug 29
IAD
Washington
SJU
San Juan
$145 Roundtrip, found 2 hours ago
$145
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Mon, Aug 25 from Washington to San Juan, returning Fri, Aug 29, priced at $145 found 2 hours ago
Frontier Airlines
Sun, Aug 24 - Sat, Aug 30
IAD
Washington
SJU
San Juan
$148 Roundtrip, just found
$148
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Aug 24 from Washington to San Juan, returning Sat, Aug 30, priced at $148 just found
United
Sun, Nov 9 - Mon, Nov 10
IAD
Washington
SJU
San Juan
$151 Roundtrip, found 5 days ago
$151
Roundtrip
found 5 days ago
Select United flight, departing Sun, Nov 9 from Washington to San Juan, returning Mon, Nov 10, priced at $151 found 5 days ago
United
Sun, Oct 19 - Sat, Oct 25
IAD
Washington
SJU
San Juan
$152 Roundtrip, just found
$152
Roundtrip
just found
Select United flight, departing Sun, Oct 19 from Washington to San Juan, returning Sat, Oct 25, priced at $152 just found
Delta
Tue, Oct 14 - Sat, Oct 18
IAD
Washington
SJU
San Juan
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Delta flight, departing Tue, Oct 14 from Washington to San Juan, returning Sat, Oct 18, priced at $177 just found

Find the cheapest month to fly from Washington (IAD) to San Juan (SJU)

February is typically the cheapest month to fly

From $128 - $559 per traveler.

Graph displaying average flight prices per month

Alternative airports near San Juan

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Luis Munoz Marin Intl. SJU. Cheapest option available. Average driving time to city center is 16 minutes. Flights from $226
SJU
Luis Munoz Marin Intl.
Cheapest
Average driving time to city center16 min
Flights from $226
Flights from Washington (IAD) to San Juan (SJU)
Origin airport
Washington Dulles Intl.
Destination airport
Luis Munoz Marin Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, United
Roundtrip price
$136
Distance
1574 mi
Average flight time
3 hours 55 mins

Washington to San Juan Flights

The cheapest times to fly from Washington to San Juan

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to San Juan are during the month of October. You can find some of the cheapest flights from Washington to San Juan with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to San Juan

Sunday is one of the best days to book for cheap flights from Washington to San Juan: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to San Juan

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to San Juan in 2025. You can also book with separate airlines for your outbound and return journeys, from $68 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to San Juan flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to San Juan airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU) cost?
Cheap return flights from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU) start at $136. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United flight leaving IAD on August 3 2025 and touching down at SJU. The price was last updated on July 11 2025 and has not changed since.
What is the cheapest month to fly from IAD to SJU?
The cheapest flights from IAD to SJU are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
When flying out of Washington Dulles Intl. Airport (IAD), you can jump on a nonstop flight to Luis Munoz Marin Intl. Airport (SJU) with United Airlines.
What is the cheapest airline that flies from IAD to SJU?
With prices as low as $68 for a one-way flight from IAD to SJU, United is currently the cheapest carrier for this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from IAD on October 5 2025. Prices were last updated on July 11 2025 and have not changed since.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
Each day, an average of 2 nonstop flights operate from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU). Choose the departure time that best suits your plans.
What are the most popular departure times for flights from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
Flights between IAD and SJU are their busiest at 8 AM. If you'd like a quieter trip and possibly cheaper prices, look for a time when demand is lower.
What day of the week has the most flights from IAD to SJU?
Jet off on a Friday if you're looking for the best selection of flights from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU).
What is the earliest flight from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
The first flight of the day leaving Washington Dulles Intl. Airport (IAD) is at around 8:30AM UTC-5. Board this plane and you'll land at Luis Munoz Marin Intl. Airport (SJU) at approximately 1:17PM UTC-4. The total flight duration is 3h 47m.
How long does it take to fly from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
Flights from IAD to SJU have an average travel time of 3 hours and 47 minutes. The distance between the two is 1,600 mi.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
To reach Luis Munoz Marin Intl. Airport (SJU) on time, opt for a flight that leaves from Washington Dulles Intl. Airport (IAD) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for San Juan from Washington Dulles Intl. Airport (IAD)?
Explore your flight options from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU). This is the only San Juan airport you can fly into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU) last-minute?
Last-minute bookings from IAD to SJU are generally more expensive. For the cheapest rates, start looking for flights as soon as possible. That said, if your travel plans are flexible, you may find a cheap ticket right before your trip.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
In most cases, you can cancel or modify your IAD to SJU flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need further details, visit our Customer Service portal.

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