$227 Cheap Flights from Seattle (SEA) to San Juan (SJU)

View $227 flight on Fri, Sep 25, 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 to San Juan (SEA-SJU)

Prices were available within the past 7 days and start at $227 for one-way flights and $449 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Oct 27 - Wed, Oct 28
SEA
Seattle
SJU
San Juan
$449 Roundtrip, found 4 hours ago
$449
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Tue, Oct 27 from Seattle to San Juan, returning Wed, Oct 28, priced at $449 found 4 hours ago
United
Tue, May 12 - Wed, May 13
SEA
Seattle
SJU
San Juan
$451 Roundtrip, found 5 hours ago
$451
Roundtrip
found 5 hours ago
Select United flight, departing Tue, May 12 from Seattle to San Juan, returning Wed, May 13, priced at $451 found 5 hours ago
Southwest Airlines
Tue, Jul 21 - Thu, Jul 23
SEA
Seattle
SJU
San Juan
$454 Roundtrip, just found
$454
Roundtrip
just found
Select Southwest Airlines flight, departing Tue, Jul 21 from Seattle to San Juan, returning Thu, Jul 23, priced at $454 just found
JetBlue Airways
Tue, Sep 15 - Wed, Sep 30
SEA
Seattle
SJU
San Juan
$455 Roundtrip, found 3 days ago
$455
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Tue, Sep 15 from Seattle to San Juan, returning Wed, Sep 30, priced at $455 found 3 days ago
United
Tue, May 12 - Thu, May 14
SEA
Seattle
SJU
San Juan
$456 Roundtrip, just found
$456
Roundtrip
just found
Select United flight, departing Tue, May 12 from Seattle to San Juan, returning Thu, May 14, priced at $456 just found
Southwest Airlines
Fri, Sep 11 - Sat, Sep 19
SEA
Seattle
SJU
San Juan
$460 Roundtrip, found 13 hours ago
$460
Roundtrip
found 13 hours ago
Select Southwest Airlines flight, departing Fri, Sep 11 from Seattle to San Juan, returning Sat, Sep 19, priced at $460 found 13 hours ago
Southwest Airlines
Tue, Oct 27 - Wed, Oct 28
SEA
Seattle
SJU
San Juan
$469 Roundtrip, found 4 hours ago
$469
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Tue, Oct 27 from Seattle to San Juan, returning Wed, Oct 28, priced at $469 found 4 hours ago
Southwest Airlines
Mon, Jul 27 - Wed, Jul 29
SEA
Seattle
SJU
San Juan
$474 Roundtrip, just found
$474
Roundtrip
just found
Select Southwest Airlines flight, departing Mon, Jul 27 from Seattle to San Juan, returning Wed, Jul 29, priced at $474 just found
American Airlines
Wed, Sep 9 - Tue, Sep 15
SEA
Seattle
SJU
San Juan
$479 Roundtrip, found 1 hour ago
$479
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Wed, Sep 9 from Seattle to San Juan, returning Tue, Sep 15, priced at $479 found 1 hour ago
Delta
Tue, Oct 27 - Wed, Oct 28
SEA
Seattle
SJU
San Juan
$489 Roundtrip, found 4 hours ago
$489
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Oct 27 from Seattle to San Juan, returning Wed, Oct 28, priced at $489 found 4 hours ago

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 $680
SJU
Luis Munoz Marin Intl.
Cheapest
Average driving time to city center16 min
Flights from $680

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

April is typically the cheapest month to fly

From $376 - $770 per traveler.

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 cheap one-way flights and cheap return flights from $449 Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) with Expedia. One-way flights typically cost between $182 and $1322, and return flights often range between $484 and $2896. 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 the cheapest fares first, and use the Price Tracking tool to receive alerts when Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
September is the cheapest month to fly from Seattle (SEA) to San Juan (SJU), with average return fares around $473. This is about 21% lower than the average price throughout the year, likely due to reduced travel demand after the summer. Other affordable months to consider are January and October.*Averages based on flights available on Expedia in the last year.
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.
What is the cheapest airline that flies from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
Frontier Airlines is one of the cheapest airlines offering connecting flights from Seattle - Tacoma Intl. (SEA) to Luis Munoz Marin Intl. (SJU) with a layover in Denver Intl. (DEN), starting from around $564. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
To find a cheap flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.), 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.)?
When flying from Seattle, WA (SEA) to San Juan (SJU), the best months are typically September and January. September offers an average price of around $473, making it a great time to visit as summer crowds dissipate. January is also a good option, providing a chance to escape the winter chill with favorable prices.*Prices based on flights available on Expedia in the last year.
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, WA (SEA) to San Juan (SJU) usually departs at around 12:05 AM, operated by American Airlines. This seasonal service is available in February and March, allowing you to maximize your time in Puerto Rico. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
The most popular departure times for flights from Seattle (SEA) to San Juan (SJU) are in the late evening, from 9pm to midnight. About 32% of passengers prefer this time window. Many major carriers, including American Airlines, United Airlines, and Delta Air Lines, offer flights during this window. This timing works well because it allows you to enjoy a full day in Seattle before your flight.
How long does it take to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
A flight from SEA to SJU with a layover takes around 10 hours 50 minutes, with the route covering approximately 3,725 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
First class seats are offered on the SEA to SJU route with Delta Air Lines and United Airlines.
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 from Seattle - Tacoma Intl. (SEA)?
From Seattle - Tacoma Intl. (SEA), you can fly into Luis Munoz Marin Intl. (SJU) to reach San Juan. Some flights may connect through major hubs like Denver Intl. (DEN), Midway Intl. (MDW), 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-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.)?
If you booked your Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Juan (SJU-Luis Munoz Marin Intl.) 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.
Airlines serving
Alaska Airlines, American Airlines, Delta, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$448
Distance
3724 mi

Book with confidence

Seattle to San Juan Flights

The cheapest times to fly from Seattle 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 Seattle to San Juan are during the month of October. You can find some of the cheapest flights from Seattle to San Juan with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to San Juan

Sunday is one of the best days to book for cheap flights from Seattle 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 Seattle 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 Seattle to San Juan in 2026. You can also book with separate airlines for your outbound and return journeys, from $227 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 Seattle 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 Seattle 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.

 

Seattle to San Juan Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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