SEA - SJU

$141 Find Cheap Flights from Seattle to San Juan

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 4/25. 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
$394
Typical prices: $463-$759
Southwest
Tue 4/28Wed 5/6
SEA - SJU • 2 stops
Cheapest one-way
$141
Typical prices: $225-$327
Frontier
Sat 4/25
SEA - SJU • 2 stops
Top airlines
Southwest
Cheapest • from $394 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
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
Baltimore (BWI)
Cheapest • Avg $541 (round-trip)
Denver (DEN)
Shortest trip • 9h 24m (one-way)
Insights
Insights
Insights
Insights
When to book
4 weeks
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
October
Cheapest • 26% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Tue, Apr 28 - Wed, May 6
Southwest Logo
9:20 am - 11:40 pm
SEA
-
SJU
11h 20m
2 stops
Southwest Logo
5:05 am - 6:30 pm
SJU
-
SEA
16h 25m
2 stops
$394Southwest
Tue, Apr 28 - Wed, May 6
United Airlines Logo
8:00 am - 9:24 pm
SEA
-
SJU
10h 24m
1 stop
United Airlines Logo
7:00 am - 6:32 pm
SJU
-
SEA
14h 32m
2 stops
$395United Airlines
Tue, Apr 28 - Thu, May 14
Southwest Logo
6:00 am - 10:40 pm
SEA
-
SJU
13h 40m
2 stops
Southwest Logo
2:00 pm - 12:05 am
SJU
-
SEA
13h 05m
2 stops
$404Southwest
Wed, Apr 29 - Thu, May 14
American Airlines Logo
6:00 am - 11:02 pm
SEA
-
SJU
14h 02m
1 stop
American Airlines Logo
3:08 pm - 12:36 am
SJU
-
SEA
12h 28m
1 stop
$405American Airlines
Mon, Apr 13 - Wed, Apr 15
American Airlines Logo
10:16 pm - 6:10 pm
SEA
-
SJU
16h 54m
1 stop
American Airlines Logo
6:00 am - 9:23 pm
SJU
-
SEA
18h 23m
1 stop
$409American Airlines
Mon, Aug 17 - Tue, Aug 25
American Airlines Logo
12:34 am - 3:59 pm
SEA
-
SJU
12h 25m
2 stops
American Airlines Logo
6:00 am - 11:42 pm
SJU
-
SEA
20h 42m
1 stop
$414American Airlines
Tue, Apr 28 - Thu, May 14
American Airlines Logo
10:25 am - 11:02 pm
SEA
-
SJU
9h 37m
1 stop
American Airlines Logo
11:59 pm - 9:35 am
SJU
-
SEA
12h 36m
1 stop
$415American Airlines
Wed, Apr 29 - Thu, May 14
American Airlines Logo
10:16 pm - 6:10 pm
SEA
-
SJU
16h 54m
1 stop
American Airlines Logo
11:59 pm - 9:35 am
SJU
-
SEA
12h 36m
1 stop
$423American Airlines
Sat, Apr 18 - Sat, Apr 25
United Airlines Logo
8:00 am - 9:24 pm
SEA
-
SJU
10h 24m
1 stop
United Airlines Logo
7:00 am - 6:35 pm
SJU
-
SEA
14h 35m
2 stops
$427United Airlines
Fri, Apr 10 - Wed, Apr 22
American Airlines Logo
6:00 am - 11:02 pm
SEA
-
SJU
14h 02m
1 stop
American Airlines Logo
11:59 pm - 1:15 pm
SJU
-
SEA
16h 16m
1 stop
$445American Airlines
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 April.

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 $431 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is $810 and $695 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 24 weeks before departure.

Good to know

Low seasonSeptember
Cheapest flight$141
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly and prices are also 7% lower on average.
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 3 days, the lowest price for a flight from Seattle to San Juan Luis Munoz Marin Intl Airport was $141 for a one-way ticket and $394 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 $618 and an overall rating of 8.0, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $880 and an overall rating of 8.0.

  • 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.
8.0
SouthwestOverall score based on 4301 reviews
8.6Crew
8.1Boarding
8.0Comfort
7.5Entertainment
7.0Food
Airline reviews

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

2.0 MediocreAnonymous, Feb 2026
BWI - PBI
Read more Southwest reviews

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

The WiFi and crew on the plane were good, however, the boarding experience was awful. I paid for the Choice Preferred and was boarded in group 5 so all overhead storage was full. They found room for our luggage, but further back making getting off the plane a nightmare. Also, we were in row 6 and the seats were extremely uncomfortable. Both my daughter and I had no leg room and couldn’t wait to get off the plane.

The charges were ridiculous for an hour flight and the turbulence was very scary.

Still need to work out the kinks on the new assigned seating boarding process. Otherwise, a very good flight.

WiFi did not work. Boarding with the new seating assignments took too long. The temperature in the terminal was obnoxious. +/- 80°

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

Everything was good except wifi and a leaking drink chiller. The floor was all wet and my bag was soaked. Did not notice until debarking. Have not heard back from Delta. Even though this was leg one of an international flight in first class, they denied access to their Sky Club - very disappointing!

The staff was fine. The plane was extremely tight, and I paid for the wifi and it did not work at all. I was actually going to ask for a refund.

two hour delay and the Delta representative on the PA system was unable to understand

An awesome flight crew. FC seat cushion just doesn’t cut it for a 3+ hour flight.

2+hrs delay without any reason provided and a cramped flight

We waited an hour on the runway to get a gate in Orlando

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

Flight was delayed due to crew being not on time

Flight crew issues delayed my flight by 2 1/2 hours. Causing me to miss my connection.

The staff on board and gate was nice - a welcome change from the usual. We also arrived early, which was a great benefit, given that it takes 30 minutes plus to get bags at SRQ.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

We got delayed three hours and nobody thought to have the bathroom fixed while we were sitting waiting to board? took a full hour to have maintenance come and check it off. Had to shut the bathroom down twice so that the pilots could go to the bathroom. Everyone missed their connections.

Flight left on time and we arrived 25 minutes early! There was a gate available when we arrived so early on a busy Sunday afternoon! Flight attendants came around twice with the drinks cart.

Wonderful. Quick boarding. Early departure and we arrived 30 minutes early at our destination. Unfortunately, when you arrive early, there is still a departing aircraft at our gate. We had to park for 30 minutes until the gate was clear. So our early arrival was not really early at the gate. Otherwise it was a quick and smooth flight. Appreciated the efficiency.

Flight on time. Excellent service in Premium Economy. Great food served and cleaned up promptly. Unfortunately the climate control was malfunctioning and it was very cold and felt a bit like camping. Cold helps with sleep though so not complaining too much. Slept well. It asks to rate "entertainment". I do not like any IFE, don't shove a big screen in my face—I have my own phone if I want it. So this will always get low ratings.

We had turbulence ever 1/2 hr or so and the captains announcements were SOOOO LOUD

Everything was great except for the boarding process. Everyone is lining up all at the same time and it’s hard to tell between the groups as they are way too large.

Women boarding passengers at the gate was absolutely rude and disrespectful of passengers. The flight attendant was absolutely delightful! Smiling and connected with the passengers. So happy. The seats are cramped and uncomfortable but I guess that’s just the way it is Communication regarding flight was excellent

Overall we had a good experience during our flight from San Francisco to Houston.

Airport terminal was outdated, flight was on a small jet with no wifi

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

Lack of gluten free options in food service. I have Celiac disease and it appears you no longer offer special meals for people with dietary restrictions. I am a frequent flyer traveling into and out of Omaha airport. I have noticed over the course of several months that although our flight typically arrives ahead of schedule (awesome job AA!) - we typically sit on the runway for several minutes waiting for the ground crew to get in place. Not sure if it is a ground crew issue or a gate availability issue (due to construction at this airport). Seems to be more of a ground crew being on time issue.

Arrived early picked up my bag in a few minutes- great trip - thank you

Flight boarded, departed and landed on time. Excellent service from flight attendant in FIRST

Boarding is always an ordeal. Less dogs on flights. I am highly allergic to dogs and cats. Why are there so many animals these days?

Flight to Tampa was delayed taking off due to plane arriving late but no other issues

There was a delay with the plan which cause the flight to leave later and once arrived in Chicago there was another delay and some passengers missed their connecting flights

Massimo, flight attendant was very authentic, attentive - wonderful. Food/wrap was just okay.

Worst experience ever. Flight could not land in Charlotte for what we were told was a ground stop. Had to be diverted to Raleigh to refuel. Strangely during ground stop, our connecting flight had no issue taking off on time causing us to miss our flight. We were told there were no other flights that day to our final destination and that two days out was the next one. The only flights to get us there were from Chicago the next morning. Completely opposite direction but it was a direct flight. So we get flown to Chicago and have to find a hotel in our own dime. The flight in the morning was also delayed. Thankfully only a short time. The non too of all this, our luggage did not arrive by the time we were there. Communication was terrible, through the entire trip. Complete incompetence. Will never fly American again.

We were made to wait in the airport for six hours for a flight that was ultimately canceled.

Both flights were significantly delayed. The flight experience itself was great.

My flight got delayed and eventually canceled, then rescheduled. I and several others had a connection from Boston to Paris and asked several times if we would make it. They assured us we would and then rebooked us mid flight without our consent and closed doors early even though they said they communicated we were a bit delayed. We got stranded in Boston and I opted with being rebooked for a different connection to France since they refused to pay for a Hotel. I've now been in Europe for 5 days and still haven't recieved my bags. There was absolutely no urgency for the fact that I'm in a foreign country with absolutely no change of clothes or any of my medication. Such an overwhelming and frustrating experience.

Automated scanning was slow and somewhat haphazard. Too many people were unfamiliar with the tech and were forced to learn on the fly. The hands off approach of the gate staff made it more uncomfortable. This needs work. Overall the flight and cabin crew were excellent.

The crew for the flight was A+ top notch. They were friendly and professional and made the flight a very relaxing and enjoable.

Rude crew member. She seemed annoyed at me without me saying a single word. Also loudly admonished me for having my bag next to my seat instead of tucked away before landing. Just telling me to put it away and guiding me without giving me a lecture would have been enough.

No included food for a 5 hour flight and the entertainment was only accessible if you had wired headphones (not provided). Otherwise though, great and smooth flying and customer service.

Crew were fantastic and so catering and wonderful! Full score for the entire crew!

Because of weather and mechanical issues our flight was 4 hours late. The only compensation offered to us was a meal voucher to be used only at Boston Airport and only on the day issued. But by the time it was offered to us all the restaurants were closed, so there was no way to use that offer.

Friendly crew, efficient boarding and flight arrived early. Couldn’t ask for a better experience

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

Information on your arrival and departure airports