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£187 Cheap Flights from Seattle (SEA) to San Juan (SJU)

View £187 flight on Mon, 21 Sept 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Luis Munoz Marin Intl. Airport (SJU)

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

Prices were available within the past 7 days and start at £187 for one-way flights and £373 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

JetBlue Airways
Mon, 21 Sept - Fri, 25 Sept
SEA
Seattle
SJU
San Juan
£373 Return, found 6 days ago
£373
Return
found 6 days ago
Select JetBlue Airways flight, departing Mon, 21 Sept from Seattle to San Juan, returning Fri, 25 Sept, priced at £373 found 6 days ago
JetBlue Airways
Mon, 21 Sept - Fri, 25 Sept
SEA
Seattle
SJU
San Juan
£374 Return, found 6 days ago
£374
Return
found 6 days ago
Select JetBlue Airways flight, departing Mon, 21 Sept from Seattle to San Juan, returning Fri, 25 Sept, priced at £374 found 6 days ago
JetBlue Airways
Mon, 21 Sept - Fri, 25 Sept
SEA
Seattle
SJU
San Juan
£421 Return, found 6 days ago
£421
Return
found 6 days ago
Select JetBlue Airways flight, departing Mon, 21 Sept from Seattle to San Juan, returning Fri, 25 Sept, priced at £421 found 6 days ago
JetBlue Airways
Wed, 16 Sept - Sat, 26 Sept
SEA
Seattle
SJU
San Juan
£502 Return, found 6 days ago
£502
Return
found 6 days ago
Select JetBlue Airways flight, departing Wed, 16 Sept from Seattle to San Juan, returning Sat, 26 Sept, priced at £502 found 6 days ago
JetBlue Airways
Wed, 16 Sept - Sat, 26 Sept
SEA
Seattle
SJU
San Juan
£527 Return, found 6 days ago
£527
Return
found 6 days ago
Select JetBlue Airways flight, departing Wed, 16 Sept from Seattle to San Juan, returning Sat, 26 Sept, priced at £527 found 6 days ago
JetBlue Airways
Mon, 21 Sept - Fri, 25 Sept
SEA
Seattle
SJU
San Juan
£553 Return, found 6 days ago
£553
Return
found 6 days ago
Select JetBlue Airways flight, departing Mon, 21 Sept from Seattle to San Juan, returning Fri, 25 Sept, priced at £553 found 6 days ago
JetBlue Airways
Mon, 21 Sept - Fri, 25 Sept
SEA
Seattle
SJU
San Juan
£554 Return, found 6 days ago
£554
Return
found 6 days ago
Select JetBlue Airways flight, departing Mon, 21 Sept from Seattle to San Juan, returning Fri, 25 Sept, priced at £554 found 6 days ago
JetBlue Airways
Wed, 16 Sept - Sat, 26 Sept
SEA
Seattle
SJU
San Juan
£573 Return, found 6 days ago
£573
Return
found 6 days ago
Select JetBlue Airways flight, departing Wed, 16 Sept from Seattle to San Juan, returning Sat, 26 Sept, priced at £573 found 6 days ago
JetBlue Airways
Wed, 16 Sept - Sat, 26 Sept
SEA
Seattle
SJU
San Juan
£579 Return, found 6 days ago
£579
Return
found 6 days ago
Select JetBlue Airways flight, departing Wed, 16 Sept from Seattle to San Juan, returning Sat, 26 Sept, priced at £579 found 6 days ago
Alaska Airlines
Wed, 23 Dec - Sat, 2 Jan
SEA
Seattle
SJU
San Juan
£1,556 Return, found 4 days ago
£1,556
Return
found 4 days ago
Select Alaska Airlines flight, departing Wed, 23 Dec from Seattle to San Juan, returning Sat, 2 Jan, priced at £1,556 found 4 days ago

Find the cheapest month to fly from Seattle (SEA) to San Juan (SJU)

September is typically the cheapest month to fly

From £319 - £344 per traveller.

Frequently asked questions

How much does a flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) cost?
You can find one-way and return flights from SEA to SJU with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when SEA to SJU ticket fares go up or down.
What is the cheapest month to fly from Seattle, WA (SEA) to San Juan (SJU)?
The cheapest months to fly from Seattle, WA (SEA) to San Juan (SJU) are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
Enter SEA to SJU and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Seattle, WA (SEA) to San Juan (SJU)?
To find a cheap flight from Seattle, WA (SEA) to San Juan (SJU), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
The cheapest months to fly from Seattle - Tacoma Intl. (SEA) to San Juan (SJU) are typically September and January, with average return flights costing around £353. These months are often ideal for finding good value as they fall outside peak holiday travel periods, allowing you to enjoy San Juan without the highest prices.
What is the earliest flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
The earliest flight from Seattle - Tacoma Intl. (SEA) to Luis Munoz Marin Intl. (SJU) typically departs around 12:05 AM local time. This service is operated by American Airlines. Please note that this is a seasonal service, active in February and March. An early departure like this can be great for maximising your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
There are no nonstop flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.). The distance between these two cities is approximately 5,995 kilometers. Flights with one stop typically take around 10 hours 30 minutes. If you opt for a flight with two or more stops, your travel time will be longer, usually around 13 hours 48 minutes. Keep in mind that actual flight times can vary due to factors like routing, weather, and wind patterns.
Can you fly business or first class from Seattle, WA (SEA) to San Juan (SJU)?
Select the "Business class" and "First class" filters when looking for Seattle, WA (SEA) to San Juan (SJU) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) flight with Expedia?
It's easy to earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for San Juan (SJU) from Seattle, WA (SEA)?
If you're planning to travel to San Juan from Seattle - Tacoma Intl. (SEA), you can fly directly into Luis Munoz Marin Intl. (SJU). Some flights may connect through major hubs like Denver Intl. (DEN), Midway Intl. (MDW), or Sky Harbor Intl. (PHX) before reaching San Juan. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) at the last minute?
Typically, booking a last minute flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) flight and hotel package?
Securing a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle, WA (SEA) to San Juan (SJU)?
If you booked your Seattle, WA (SEA) to San Juan (SJU) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Luis Munoz Marin Intl.
Return price
£373
Distance
5959 km

Book with confidence

Compare flights from Seattle to San Juan easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Seattle to San Juan. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Luis Munoz Marin Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Seattle - Tacoma Intl. to Luis Munoz Marin Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Seattle - Tacoma Intl. (SEA) to Luis Munoz Marin Intl. (SJU)

The easiest way to view the best deals on flights from Seattle to San Juan today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Seattle - Tacoma Intl. to Luis Munoz Marin Intl. start at just £373 and range up to £1,556.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Seattle and San Juan
  • booking your flight during September, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Seattle to San Juan flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Seattle - Tacoma Intl. to Luis Munoz Marin Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Seattle to San Juan easily and book with confidence

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*Available to Expedia members.