$74 Cheap Flights from Washington (IAD) to San Juan (SJU)

View $74 flight on Thu, Nov 13, 2025Opens in a new window

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

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

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

Prices were available within the past 7 days and start at $74 for one-way flights and $144 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sun, Oct 19 - Thu, Oct 23
IAD
Washington
SJU
San Juan
$144 Roundtrip, found 7 hours ago
$144
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Sun, Oct 19 from Washington to San Juan, returning Thu, Oct 23, priced at $144 found 7 hours ago
Frontier Airlines
Sun, Oct 19 - Sun, Oct 26
IAD
Washington
SJU
San Juan
$145 Roundtrip, found 7 hours ago
$145
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Sun, Oct 19 from Washington to San Juan, returning Sun, Oct 26, priced at $145 found 7 hours ago
Frontier Airlines
Sun, Oct 26 - Thu, Oct 30
IAD
Washington
SJU
San Juan
$149 Roundtrip, found 2 hours ago
$149
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sun, Oct 26 from Washington to San Juan, returning Thu, Oct 30, priced at $149 found 2 hours ago
Frontier Airlines
Thu, Nov 13 - Fri, Nov 21
IAD
Washington
SJU
San Juan
$152 Roundtrip, found 6 hours ago
$152
Roundtrip
found 6 hours ago
Select Frontier Airlines flight, departing Thu, Nov 13 from Washington to San Juan, returning Fri, Nov 21, priced at $152 found 6 hours ago
Frontier Airlines
Sun, Nov 16 - Thu, Dec 4
IAD
Washington
SJU
San Juan
$159 Roundtrip, found 14 hours ago
$159
Roundtrip
found 14 hours ago
Select Frontier Airlines flight, departing Sun, Nov 16 from Washington to San Juan, returning Thu, Dec 4, priced at $159 found 14 hours ago
Frontier Airlines
Sun, Oct 26 - Fri, Nov 21
IAD
Washington
SJU
San Juan
$161 Roundtrip, found 1 day ago
$161
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, Oct 26 from Washington to San Juan, returning Fri, Nov 21, priced at $161 found 1 day ago
Frontier Airlines
Sun, Oct 19 - Thu, Oct 23
IAD
Washington
SJU
San Juan
$166 Roundtrip, found 17 hours ago
$166
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Sun, Oct 19 from Washington to San Juan, returning Thu, Oct 23, priced at $166 found 17 hours ago
American Airlines
Mon, Dec 8 - Thu, Dec 11
IAD
Washington
SJU
San Juan
$192 Roundtrip, found 2 hours ago
$192
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Mon, Dec 8 from Washington to San Juan, returning Thu, Dec 11, priced at $192 found 2 hours ago
United
Mon, Dec 8 - Thu, Dec 18
IAD
Washington
SJU
San Juan
$236 Roundtrip, found 4 hours ago
$236
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Dec 8 from Washington to San Juan, returning Thu, Dec 18, priced at $236 found 4 hours ago
Delta
Tue, Nov 11 - Thu, Nov 13
IAD
Washington
SJU
San Juan
$245 Roundtrip, found 21 hours ago
$245
Roundtrip
found 21 hours ago
Select Delta flight, departing Tue, Nov 11 from Washington to San Juan, returning Thu, Nov 13, priced at $245 found 21 hours ago

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

September is typically the cheapest month to fly

From $136 - $296 per traveler.

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 $309
SJU
Luis Munoz Marin Intl.
Cheapest
Average driving time to city center16 min
Flights from $309
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
$144
Distance
1574 mi
Average flight time
3 hours 53 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 $74 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?
Grab a cheap one-way flight from $74 or cheap return flight from $144 from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
Planning your trip for October is a good way to save, as it's the cheapest month for flights between IAD and SJU. You'll often find the lowest prices during the off-season.
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 Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest IAD to SJU flight.
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.

Explore a world of travel with Expedia

*Available to One Key members.