SEA - SJU

$223 Find Cheap Flights from Seattle 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 Seattle to San Juan departing on 7/9. 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

KAYAK searches hundreds of travel sites at once for deals on flights to San Juan Luis Munoz Marin Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to San Juan.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to San Juan.
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Everything you should know

Cheapest round-trip
$460
Typical prices: $390-$552
JetBlue
Fri 9/18Sat 10/3
SEA - SJU • 1 stop
Cheapest one-way
$223
Typical prices: $263-$406
Frontier
Thu 7/9
SEA - SJU • 2 stops
Top airlines
Cheapest • from $460 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Seattle and San Juan. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $535 (round-trip)
Shortest trip • 9h 31m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 31% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 21% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Juan!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to San Juan (SEA-SJU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle 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 Seattle to San Juan

Fri, Sep 18 - Sat, Oct 3
JetBlue Logo
9:40 pm - 1:34 pm
SEA
-
SJU
12h 54m
1 stop
JetBlue Logo
10:30 am - 8:42 pm
SJU
-
SEA
13h 12m
1 stop
$460JetBlue
Sat, Dec 5 - Sat, Dec 12
Delta Logo
9:55 pm - 1:05 pm
SEA
-
SJU
11h 10m
1 stop
Delta Logo
7:15 am - 6:30 pm
SJU
-
SEA
15h 15m
2 stops
$464Delta
Wed, Sep 2 - Mon, Sep 7
American Airlines Logo
3:47 pm - 2:54 pm
SEA
-
SJU
20h 07m
1 stop
American Airlines Logo
7:00 am - 10:56 pm
SJU
-
SEA
18h 56m
1 stop
$469American Airlines
Fri, Oct 9 - Tue, Oct 13
JetBlue Logo
10:15 pm - 11:28 am
SEA
-
SJU
10h 13m
1 stop
JetBlue Logo
1:00 pm - 9:15 pm
SJU
-
SEA
11h 15m
1 stop
$470JetBlue
Tue, Aug 18 - Sun, Aug 23
American Airlines Logo
11:56 pm - 4:11 pm
SEA
-
SJU
13h 15m
2 stops
American Airlines Logo
12:55 am - 9:29 am
SJU
-
SEA
11h 34m
1 stop
$474American Airlines
Wed, Sep 2 - Sun, Sep 6
American Airlines Logo
3:47 pm - 2:54 pm
SEA
-
SJU
20h 07m
1 stop
American Airlines Logo
12:55 am - 9:29 am
SJU
-
SEA
11h 34m
1 stop
$479American Airlines
Wed, Sep 23 - Wed, Sep 30
Southwest Logo
6:40 am - 10:00 pm
SEA
-
SJU
12h 20m
2 stops
Southwest Logo
1:45 pm - 11:05 pm
SJU
-
SEA
12h 20m
2 stops
$480Southwest
Mon, Sep 7 - Mon, Sep 14
United Airlines Logo
11:59 pm - 3:12 pm
SEA
-
SJU
12h 13m
1 stop
United Airlines Logo
1:00 am - 12:48 pm
SJU
-
SEA
14h 48m
2 stops
$483United Airlines
Tue, Nov 10 - Tue, Nov 24
American Airlines Logo
3:51 pm - 5:30 am
SEA
-
SJU
9h 39m
1 stop
American Airlines Logo
7:40 am - 11:40 pm
SJU
-
SEA
20h 00m
1 stop
$485American Airlines
Mon, Aug 10 - Tue, Aug 18
Southwest Logo
6:15 pm - 11:00 am
SEA
-
SJU
13h 45m
2 stops
Southwest Logo
1:20 pm - 11:05 pm
SJU
-
SEA
12h 45m
2 stops
$495Southwest
Booking Insights

KAYAK's insights & trends for Seattle to San Juan flights

Get data-powered insights and trends into flights from Seattle 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 Seattle 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 Seattle to San Juan Luis Munoz Marin Intl Airport departing in September.

What is the cheapest month to fly from Seattle 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 Seattle 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 Seattle to San Juan Luis Munoz Marin Intl Airport is October, where tickets cost $462 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is $809 and $656 respectively.

How far in advance should I book a flight from Seattle 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 Seattle 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 Seattle to San Juan Luis Munoz Marin Intl Airport, you should book around 4 weeks before departure, which saves you about 31% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Good to know

Low seasonSeptember
Cheapest flight$223
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Seattle to San Juan

When to book flights from Seattle to San Juan

Are your dates flexible? Find out the best times to travel from Seattle 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 Seattle to San Juan flights

  • What is the cheapest flight from Seattle to San Juan Luis Munoz Marin Intl Airport?

    In the last 5 days, the lowest price for a flight from Seattle to San Juan Luis Munoz Marin Intl Airport was $223 for a one-way ticket and $460 for a round-trip.

  • Do I need a passport to fly between Seattle and San Juan?

    Yes

  • Which airports will I be using when flying from Seattle to San Juan?

    On your way to San Juan, you’ll fly out from Seattle/Tacoma Intl. You’ll be landing at San Juan Luis Munoz Marin Intl.

  • Which aircraft models fly most regularly from Seattle to San Juan?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to San Juan?

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

  • What is the most popular layover when flying to San Juan from Seattle?

    Dallas is the most popular layover city among KAYAK users traveling from Seattle to San Juan.

  • Which is the best airline for flights from Seattle to San Juan, Southwest or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from Seattle to San Juan are Southwest and Alaska Airlines. With an average price for the route of $625 and an overall rating of 7.9, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $727 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Seattle 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 Seattle to San Juan.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Juan from Seattle 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 Seattle 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 Seattle with another airline. Booking your flights between Seattle 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 Seattle 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 Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Seattle to San Juan

 
See real verified KAYAK customer reviews for airlines flying from Seattle 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 Seattle 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.
7.9
SouthwestOverall score based on 4242 reviews
8.0Comfort
8.1Boarding
7.5Entertainment
7.0Food
8.6Crew
Airline reviews

Over a 3 hour flight. The turbulence was almost imperceptible except for 2 short periods which were not bad and over quickly. The attendants claimed "Safety first" and sat looking at their phones for 3 hours with no drink or snack service. This isn't the first time with Southwest. I thinkit may be there new plan of operation. Oh, and it was June 18, Southwest's Birthday which offered free drinks. NOT.

4.0 OkayJeff, Jun 2026
MCI - FLL
Read more Southwest reviews

Over a 3 hour flight. The turbulence was almost imperceptible except for 2 short periods which were not bad and over quickly. The attendants claimed "Safety first" and sat looking at their phones for 3 hours with no drink or snack service. This isn't the first time with Southwest. I thinkit may be there new plan of operation. Oh, and it was June 18, Southwest's Birthday which offered free drinks. NOT.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

It was great. The gate staff were very helpful in Portland when my son forgot his rolling bag and had to go back to get it just in time to make it on the plane. We really appreciate that. Great job!

Airline is not very senior friendly. Flights are late, forcing us to run to the connecting flight. Food is awful. Wish they would go back to pretzels and peanuts. During flight, pressurization isn’t quite right and all of our ears get plugged. Everything is nickel and dime, charging for boarding, seat selection and legroom. While a screen at the desk in the gate area says check your roll on bag now for free due to space limitation, the employee at the desk will not check the bag without a $100 fee. Insane.

Kayak could’ve posted the correct gate number. Almost missed my flight.

Slow boarding, limited food and drink portions. Bad delays and turbulence

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

OKay. I sat in the back of the plane and it was really loud between babies and little kids, and adults who.like to talk a lot and loudly most of the flight.

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Third flight in two months where the crew was not there. Comfort seating does not guarantee overhead bin space. Passengers with children are allowed on the plane first - if you are flying to and from Orlando, this means half the plane has boarded before you get on. And somehow all the bin space is taken up. 3 out of 5 flights have had issues with equipment or procedure. Some of these instances caused the flight to be delayed because of a "nuisance" light. One time it was a bag that had been brought on board but did not belong to anyone so we had to return to the gate. Last night we were told the "AC" on the plane doesn't work well and we're 10th for take off- because the crew was late - and that it will get cool when we're in the air. Not sure if this is usual, but I didn't think flight crew could jump seat in first class. Movie and TV selection has not been refreshed for several months- flying one to two round trips each month easily exhausts the list of content.

Great experience nice pilot very soft and easy landing and take off

We sat on the runway for over an hour before departure. That was unwelcome.

Horrible. Faucet in sink not working, wifi not working. Didn’t bring food or snacks

Flight was delayed before take off and at landing. Baggage took 20 minutes. Flight crew would not serve full soft drink and had to ask multiple times before receiving water.

From checking to boarding, it was a seamless experience. The service agents were so helpful. The flight crew was so pleasant.

Gate agent showed up 20 minutes before boarding and was not at all friendly. Had to take this flight due to the one on the day before being cancelled and any later options were already full with long standby lists. Despite having paid for Delta Comfort seats, Delta did not allow me (or anyone) to choose their seat. The agent assigned them for everyone just prior to boarding. Self seat selection was allowed on the original flight. Flight staff was great - very friendly.

Flight attendants were great. Cheerful, upbeat and friendly. Jet, in particular, was fantastic.

I have Precheck. Flew HPN to DEN and return this past weekend. Delta didn't attach my Precheck number to this trip. So it was waiting in general line especially in Denver. Unavailable.

The Boarding process was great. Particularly since my wife and I require assistance. The flight attendants were amazing. We travel frequently; they honestly were a cut above. 😀

They delayed the flight 3 hours because it wasn't full they moved us to 5 different gates probably the worst airline ever not even spirit is this bad.

Very easy ! Use the kiosk and bag drop and right to security within 10 min

Checking bag at terminal was horrible. No agents to check us in and only 1 kiosk working. Boarding went ok. Crew onboard was very scattered rained. Missed our row while serving and then didn’t see them hardly again.

Crew was amazing, takeoff wonderful. The bathroom was disgusting from before takeoff the odor made the flight uncomfortable as you could smell the bathroom from the center of the plane where we were sitting. Smelled like raw sewage. My daughter was throwing up as we landed due to the smell and horrible turbulence as we approached Newark.

Airline tickets are not cheap. You expect reliable competent service. Thanks to canceled flights and botched transfers we arrived at our destination two days late. This is not acceptable

Horrible! Several delays and then was cancelled! I spent over 24 hours in the airport and was unable to get a hotel or food voucher.

The entertainment they offer could use some games, and maybe they could add some cookies to the snack menu. And the automated messages are a bit repetitive. But it was comfortable temperature wise and the seats were comfortable. The crew is very polite and helpful

The entertainment is a bit limited, it would be better if they added some games to play besides the movies and tv shows. But the seats are comfortable and the crew is polite

This planes staff was top tier. Everything went great and had a great flight home.

Food was great. Staff was phenomenal. Seats were a bit hard and could use a lot more entertainment options as far as movies to choose from. WiFi was good. Overall great trip.

They did not offer coffee on a 7am flight…awful!!

Plane temperature was so hot that everyone on the plane was sweating. Departure gates changed 3 times in the hour before the flight. Internet service was so poor in the terminal that updates weren't always being received.

We had a mechanical delay which made us 90 minutes late (9:30 PM) then land and put into the penalty box because a plane was in our gate? What the hell! We should get priority.Damn American.

Check in for 5am flight at RDU was hampered by American check in counters being seriously understaffed , was told even supervisor called out. Took so long in line for special services check in that we missed our 5am departure even after arriving at 3:30am. Had to be rescheduled to later flight from Charlotte to St Thomas.

Delayed flight due to maintenance and I have had multiple delayed flights due to maintenance in the last month plus

Excellent service. Flight attendance like Jessica,, on our flight, is a reason I wouldn’t mind flying through British Airways again. Jessica,, was very courteous and helpful.

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.

Significant delays on my trip to Chicago and my trip back to NY

Terrible boarding and first class experience. Nice staff but overall disorganized, dirty plane.

Delayed by 5 hours and I had to wit in the airport for more than 6+ hours.

The aircraft was fine, it’s was just the service. The flight got canceled several times and that was very inconvenient for my 69 years old mom.

My checked in luggage cost was $59, almost ticket price. The first 13 rows were empty, but fly attendant did not alow women with little boy change her middle sit, sweet boy was crying, I am so sorry for mother and passengers. At the end of the flight the cabin became impossible cold. Only good was timing of departure and early landing, but it suppose to be normal.

Seamless flight, didn’t feel like five hours at all very smooth ride. Watched two good movies didn’t even realize I was on a plane. The staff were extremely nice and helpful.

I tried to book a flight with Jet Blue. Your third party company hijacked my attempt with a website that looked like I was booking with Jet Blue. I realized it when I paid. I tried to cancel and was told by a man in India that there were no refunds. $735 stolen, Thanks Kayak!

It was inexplicably canceled and we are stuck in LA, haven't gotten home and it has been an inconvenience having lost work (on unpaid leave for my husband).

I like everything. Blythe at DCA is the absolute best!

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!

They lost my luggage and refuse to help. Terrible airline. I've never experienced worse customer service in my life. Pretty much just told me too bad that I lost all my luggage, not caring that I am stuck in Europe for 2 weeks with absolutely nothing.

You should have had Wifi to make it much enjoyable.

The flight out was delayed from 3:40pm to 5pm and again to 8pm. We boarded after 5pm, had to disembark because they could not get the Engine started, then we switched gates and got a new plane and did not board until after 8pm.

Everything you need to know for your flight from Seattle to San Juan

Information on your arrival and departure airports