IAD - SJU

$143 Find Cheap Flights from Washington Dulles Airport to San Juan - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to San Juan departing on 8/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$316
Typical prices: $257-$520
American Airlines
Tue 8/18Tue 8/25
IAD - SJU • 1 stop
Cheapest non-stop
$352
Typical prices: $333-$463
United Airlines
Tue 9/1Tue 9/1
IAD - SJU • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United Economy Plus adds up to six inches more legroom than standard economy.
Frontier Basic Fare can add carry-on and seat selection fees; bundles add value.
Expert advice
Expert advice
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Top airlines
Cheapest • from $316 (round-trip)
Best reviews • 7.8 score
Airline reviews
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Airline reviews
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Nonstop flights
You can fly direct with United Airlines. Average duration is 4h 00m
Direct flights
Direct flights
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+1
Direct flights
Direct flights
+1
Avoid delays
Most punctual • 83% on-time
Best time • Fewest delays
Insights
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Insights
Insights
Top layover airports
Cheapest • Avg $299 (round-trip)
Shortest trip • 6h 43m (one-way)
Insights
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When to travel
Cheapest • 22% price drop
Most popular
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Flight Deals

Cheap Flights from Dulles Intl to San Juan (IAD-SJU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to San Juan that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Dulles Intl to San Juan

Tue, Aug 18 - Tue, Aug 25
American Airlines Logo
7:57 am - 11:59 pm
IAD
-
SJU
16h 02m
1 stop
American Airlines Logo
7:30 am - 8:56 pm
SJU
-
IAD
13h 26m
1 stop
$316American Airlines
Mon, Aug 10 - Fri, Aug 14
Frontier Logo
6:09 pm - 4:11 pm
IAD
-
SJU
22h 02m
1 stop
Frontier Logo
5:20 pm - 4:34 pm
SJU
-
IAD
23h 14m
1 stop
$318Frontier
Sat, Aug 15 - Wed, Aug 19
Frontier Logo
5:29 pm - 4:11 pm
IAD
-
SJU
22h 42m
1 stop
Frontier Logo
12:11 pm - 10:52 pm
SJU
-
IAD
10h 41m
2 stops
$319Frontier
Sat, Jul 18 - Mon, Aug 3
Multiple Airlines Logo
5:29 pm - 4:05 pm
IAD
-
SJU
22h 36m
1 stop
Multiple Airlines Logo
6:45 am - 5:56 pm
SJU
-
IAD
11h 11m
1 stop
$320Multiple Airlines
Sat, Aug 29 - Tue, Sep 1
American Airlines Logo
7:57 am - 2:51 pm
IAD
-
SJU
6h 54m
1 stop
American Airlines Logo
7:30 am - 4:53 pm
SJU
-
IAD
9h 23m
1 stop
$321American Airlines
Thu, Jul 23 - Sat, Aug 1
Frontier Logo
8:33 pm - 2:00 pm
IAD
-
SJU
41h 27m
2 stops
Frontier Logo
6:00 am - 7:38 pm
SJU
-
IAD
13h 38m
1 stop
$322Frontier
Sat, Aug 1 - Tue, Aug 4
Frontier Logo
5:29 pm - 4:05 pm
IAD
-
SJU
22h 36m
1 stop
Frontier Logo
6:00 am - 7:38 pm
SJU
-
IAD
13h 38m
1 stop
$323Frontier
Tue, Jul 28 - Fri, Jul 31
Frontier Logo
5:40 pm - 4:05 pm
IAD
-
SJU
22h 25m
1 stop
Frontier Logo
6:00 am - 7:38 pm
SJU
-
IAD
13h 38m
1 stop
$324Frontier
Tue, Sep 1 - Wed, Sep 9
American Airlines Logo
1:23 pm - 11:59 pm
IAD
-
SJU
10h 36m
1 stop
American Airlines Logo
3:41 pm - 10:51 pm
SJU
-
IAD
7h 10m
1 stop
$325American Airlines
Fri, Jul 17 - Fri, Jul 24
Multiple Airlines Logo
6:46 pm - 1:55 pm
IAD
-
SJU
19h 09m
1 stop
Multiple Airlines Logo
6:45 am - 4:34 pm
SJU
-
IAD
33h 49m
2 stops
$326Multiple Airlines
Booking Insights

KAYAK's insights & trends for Dulles Intl to San Juan flights

Get data-powered insights and trends into flights from Dulles Intl to San Juan to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport departing in August.

What’s the cheapest day of the week to fly from Washington Dulles Airport to San Juan?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to San Juan on a Sunday, as we generally find the cheapest rates on that day for this route. On the other hand, Wednesday is the most expensive day to fly from Washington Dulles Airport to San Juan. For your return ticket, we recommend flying on a Thursday and avoiding Mondays for the best deals.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport is February, where tickets cost $327 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $493 and $492 respectively.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $497 on average.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Expert advice

Expert advice for your flight from Dulles Intl to San Juan

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines, Frontier and IAD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Gabriel Leigh

Gabriel Leigh

Expert on SJU

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Good to know

Low seasonSeptember
Cheapest flight$143
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 17% increase in price.
Flight from Washington Dulles Airport to San Juan

When to book flights from Dulles Intl to San Juan

Are your dates flexible? Find out the best times to travel from Dulles Intl to San Juan based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Washington Dulles Airport to San Juan flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport?

    In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport was $143 for a one-way ticket and $316 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and San Juan?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Washington Dulles Airport and on arrival in San Juan.

  • Which airports will I be using when flying from Washington Dulles Airport to San Juan?

    Washington Dulles Airport and San Juan are both served by 1 main airport. You will leave Washington Dulles Airport from Washington, D.C. Dulles Intl and will be arriving at San Juan Luis Munoz Marin Intl.

  • Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to San Juan?

    JetBlue, American Airlines, and Delta offer inflight Wi-Fi service on the Washington Dulles Airport to San Juan flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to San Juan?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Washington Dulles Airport to San Juan flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to San Juan?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Washington Dulles Airport and San Juan, with oneworld being the most commonly used for this route.

  • On which days can I fly direct from Washington Dulles Airport to San Juan?

    There are nonstop flights from Washington Dulles Airport to San Juan on a daily basis.

  • Which is the best airline for flights from Washington, D.C. to San Juan, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to San Juan are Delta and United Airlines. With an average price for the route of $323 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $489 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to San Juan?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington Dulles Airport to San Juan.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to San Juan?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Juan from Washington Dulles Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington Dulles Airport to San Juan?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Juan with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and SJU can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to San Juan?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Juan from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $194 or less one-way and $430 or less round-trip.

Prefer to fly direct from Washington Dulles Airport to San Juan?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Dulles Intl to San Juan Luis Munoz Marin Intl.
Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to San Juan Luis Munoz Marin Intl Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to San Juan Luis Munoz Marin Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

San Juan Luis Munoz Marin Intl to Washington, D.C. Dulles Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the top 5 airlines serving from Dulles Intl to San Juan

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to San Juan. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Dulles Intl to San Juan? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
DeltaOverall score based on 8451 reviews
7.8Entertainment
7.2Food
8.1Boarding
7.8Comfort
8.5Crew
Airline reviews

The gentleman at the gate I think his name is RIE was exceptional

10.0 ExcellentGireesh, Apr 2026
DCA - DTW
Read more Delta reviews

The gentleman at the gate I think his name is RIE was exceptional

It was good. The leg room was not great in Row 1.

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

2 of the seats in row 31 the entertainment system was not working, and one seat the tray table did not go all the way down. Flight arrived early and departed on time which was great.

Waited at the usual crowded gate at DCA where one ends up standing up because there aren't enough seats.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

Inexpensive, got an exit row aisle aeat with no middle passenger, bought a great breakfast sandwich, flight comfortable & arrived ahead of schedule.

When we checked in my friend and I were sitting seperate. By the time we got to boarding, they automatically switched our seats. I really liked that.

I wouldn't say I liked being forced to check my small roller bag at the gate; too many people had bags and were in a higher boarding group.

I trust Delta. I travel comfortable. The snacks could improve or could go to something as a little sandwich.

Staff could’ve been a little more cordial. The men were much more friendlier than the women. My daughter and I also missed the 2nd to last meal as we were sleeping but that is on us.

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

Did not like that we couldn't complete check in on-line without providing pictures of our passports. Worry about identity theft. We had no delays and boarding was handled In an efficient manner.

Excellent! I got to Munich and was transferred to my Lufthansa flight quickly, in 15 to 20 minutes, so I did not miss my flight. However, I had checked my overhead bag at the boarding gate in Tampa. That got to Tunis the next day. That is to be expected.

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

My flight was completely full. Making me very stressful with people walking around all the time. I believe airlines can do better for entertain people during the flight.

The United website was easy to use and had all the information I needed. I needed to change my flight and it was accomplished easily on line. I was also easily able to upgrade and for a reasonable price. Boarding went smoothly and the flight was in time. The service was good in board but the crew did not seem happy at all. Limited availability of meals - not much choice for purchase and in business class they ran out of one of the meal choices by row 4. .

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

As always, most AA flights that we fly are almost ALWAYS delayed and that too multiple times. Very frustrating

Delayed delayed. Poor professionalism. Our seats changed and we pay for them

The small flights with Valet Luggage has a poor service

Overall a good experience, however Wifi was not working on the flight.

Human interaction. Thought there would be more service-even a smile would have been nice.

The plane was broken so we had to change planes.

Uncomfortable seats and flight attendant was rude as she insisted on waking up my husband to ask him if he wanted a drink. When he said that he was sleeping, she replied “without an attitude “. He was seated at 8c

Airlines must do something with overweight people... Maybe reserve a business class seat for them, or you could pay the consequences if someone overweight seat side by side to you in economy.

Iberia didn’t let me check in online or select my seats, the experience overall was not very pleasant

Flight was delayed many times. The crew was friendly but you eleven had to buy headphones to access the movies in the plane. $8 is not a lot for one person but it is when you travel with all your family.

A nightmare. Scheduled flight delayed 2 hours then cancelled because pilot timed out . Unable to find another pilot. Really?! Weather certainly a factor, but JetBlue seemed totally unprepared for the chaos that ensued when flight routes were cancelled. More cancelled flights, finally many of us who had been bumped from other flights were allowed to board a Boston bound plane around 3:00am, delay after delay, sat on tarmac for another half hour while pilot dealt with weight distribution issues (?), arrived in Boston 4:30. Crew were wonderful- same attendants all day and night and they were exhausted. Fortunately for me and my son that Boston was our final destination, not so lucky for many who missed connecting flights.

The flight was delayed 14 hours and communication was very poor. No one seemed to know what was happening and the gate agent was trying to help people for several flights. She was by herself trying to help 100s of people.

JetBlue worker, Blythe, was so amazing at the DCA counter. If it wasn’t for her, I’m not sure we would’ve made it through. Please thank her!

JetBlue is always consistent and great, the food is limited in selection, but at least you can grab as much as you want on snacks and drinks at the Blue Locker.

at the time for boarding the lady just call Group A and no other goups and everybody from A to F go inside without the right turn,and when we get in theres no more spsce for carry on , the ones that get in at not correct group from the back occupy our space !!!!! a mess !!!!

The boarding and flight were ok, but there were several painful issues. The flight was 3:20 in the air and almost four hours door to door, but they only had snack packs on the plane. They really need to have food on longer flights or make it clear to everyone that they won’t have food. They also advertise free WiFi, but it did not work for 90% of this flight. Again, almost four hours door to door. If I had known I was flying spirit for JetBlue prices then I would have planned differently.

I think the food / snack service was very poor. tehy could have done better. Evrything else was great

No wifi, not even while close to the continental US or Puerto Rico, no entertainment whatsoever (TVs not working). Totally disappointing.

Wifi screens were great. Both flights were delayed, spending all day flying home and then getting home at 3am ruins the next day also.

First of all we hade waited 3 hours in the airplane waiting to leave. Second the return schedule was changed and it messed up my entire vaction. I won't buy never again another flight and recommend to nobody traveling with them.

The worst. They don’t follow procedure for boarding per group. Flight got delayed for no understandably reasons, they changed our destination from PR to Miami, left us inside a plane for more than 8 hours, then cancelled flight in Miami leaving us stranded. Poorly managed re-accommodation for a new flight and overnight stay so I have to spend in a new ticket and my own hotel room to been able to get to my office next day. Lost 2 days of work and as a doctor, patients loosing their appointments. to other flights and besides

I missed a flight because of a delay. I had to buy a new ticket through Southwest.

I liked the price of the flight and the chance to buy a seat with no person seated in the middle seat.. Also the flight was right on time.

Bag should not be so much money. This is how Frontier takes advantage of customers

The flight left over two hours late. They charged me $180 to bring a carry on. There was an error with the spelling of my name and Frontair agent lied that I would need to pay $200 for her to fix the spelling, and pressured me that if I don't do it quick I would lose the flight. I called back and another agent said it costs $75 to fix. All in all, this company is a complete scam.

I took my first and last flight with FRONTIER. The seats are not able to be reclined so it’s not a very comfortable experience when you take a flight of 3 hours or longer. You must pay for your luggage either carry on or check in, so taking all this in consideration at the end what you think you’re saving your paying in services that should be included. Not a beverage in sight. . You’re seriously better off getting on a proper airline such as Delta, AA, United, etc.

Horrible and worse flight ever. Was left at the airport in SJU by my flight to JFK after several delay at Santa Domingo. Will never recommend Frontier to any one. After leaving, frontier customer service ask me to rebook and pay for another flight to from SJU to JFK. Worse airline ever. You pay for everything with frontier airline.

Frontier notifying me earlier of flight delay of over 2 hours.

Excellent crew. WE all know Frontier its a low cost airline but the travel time was about 30 minutes and the crew was phenomenal. I was with a group of 10 more and we are enjoy our flight. The only issue was in SJU waiting for the luggage.

Everything you need to know for your flight from Dulles Intl to San Juan

Information on your arrival and departure airports