HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Luis Munoz Marin Intl

$171+ Cheap flights from Seattle (SEA) to Luis Munoz Marin Intl (SJU)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SJU
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Luis Munoz Marin Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to San Juan Luis Munoz Marin Intl are usually found in January or October, booked 55 days in advance, depart on a Tuesday or Monday and return on a Tuesday

Cheap flight deals from Seattle to Luis Munoz Marin Intl

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Luis Munoz Marin Intl (SJU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 28, 2025.

Round-trip from

$362
(Trip.com)

One-way from

$171
(Trip.com)

Popular in

December

Cheapest in

January

Average price

$705
From Seattle/Tacoma Intl to San Juan Luis Munoz Marin Intl
Search Deals
One-way flight from Seattle/Tacoma Intl to San Juan Luis Munoz Marin Intl
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Seattle to Luis Munoz Marin Intl

Cheapest flights from Seattle to Luis Munoz Marin Intl
Explore the most affordable flight options available from Seattle to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2025.

This Trip.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2011:59 pmSEA - SJU
1 stop13h 44mJetBlue
Sat 9/271:25 pmSJU - SEA
1 stop11h 55mJetBlue
Deal found 7/26$362
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:51 pmSEA - SJU
1 stop12h 56mAmerican Airlines
Tue 9/301:37 pmSJU - SEA
1 stop13h 22mAmerican Airlines
Deal found 7/27$377
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2211:54 pmSEA - SJU
1 stop11h 50mUnited Airlines
Sun 9/281:05 amSJU - SEA
1 stop12h 42mUnited Airlines
Deal found 7/28$398
This Frontier deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/83:11 pmSEA - SJU
2 stops16h 02mFrontier
Sat 8/168:15 amSJU - SEA
2 stops18h 27mFrontier
Deal found 7/27$445
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/199:10 pmSEA - SJU
1 stop12h 35mSouthwest
Fri 9/2611:10 amSJU - SEA
2 stops11h 45mSouthwest
Deal found 7/26$451
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:00 amSEA - SJU
2 stops13h 00mDelta
Thu 10/912:51 pmSJU - SEA
2 stops14h 08mDelta
Deal found 7/27$483
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/115:30 pmSEA - SJU
2 stops23h 51mMultiple Airlines
Thu 8/142:11 amSJU - SEA
3 stops23h 39mMultiple Airlines
Deal found 7/27$493
This Sun Country Air deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:31 pmSEA - SJU
1 stop15h 36mSun Country Air
Thu 12/185:14 pmSJU - SEA
1 stop33h 34mSun Country Air
Deal found 7/28$529

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Luis Munoz Marin Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2025.
Use the filters below to find and compare flights from Seattle to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Seattle

Fly to

Luis Munoz Marin Intl

Route

Depart

Return

Price

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 9/20

11:59 pm-4:43 pm

1 stop13h 44m

San Juan Luis Munoz Marin Intl

Sat 9/27

1:25 pm-10:20 pm

1 stop11h 55m

$362

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 9/23

8:51 pm-12:47 pm

1 stop12h 56m

San Juan Luis Munoz Marin Intl

Tue 9/30

1:37 pm-11:59 pm

1 stop13h 22m

$377

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 9/22

7:34 pm-1:45 pm

2 stops15h 11m

San Juan Luis Munoz Marin Intl

Sun 9/28

1:05 am-10:47 am

1 stop12h 42m

$398

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 8/8

3:11 pm-10:13 am

2 stops16h 02m

San Juan Luis Munoz Marin Intl

Sat 8/16

8:15 am-11:42 pm

2 stops18h 27m

$445

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 9/19

9:10 pm-12:45 pm

1 stop12h 35m

San Juan Luis Munoz Marin Intl

Fri 9/26

11:10 am-7:55 pm

2 stops11h 45m

$451

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 10/3

6:00 am-10:00 pm

2 stops13h 00m

San Juan Luis Munoz Marin Intl

Thu 10/9

12:51 pm-11:59 pm

2 stops14h 08m

$483

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 8/11

5:30 pm-8:21 pm

2 stops23h 51m

San Juan Luis Munoz Marin Intl

Thu 8/14

2:11 am-10:50 pm

3 stops23h 39m

$493

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 10/3

11:59 pm-1:47 pm

1 stop10h 48m

$171

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Thu 9/25

7:50 am-11:37 pm

2 stops12h 47m

$189

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 8/15

8:01 pm-3:54 pm

2 stops16h 53m

$215

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 16 results
1
2

Best time to book a flight from Seattle to Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to San Juan Luis Munoz Marin Intl Airport

How far ahead should I book a flight from Seattle to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Luis Munoz Marin Intl. Price data was last updated on July 25, 2025.

Booking 55 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to San Juan Luis Munoz Marin Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, September is the cheapest month in which you can book a flight from Seattle to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from Seattle to San Juan Luis Munoz Marin Intl Airport in June is currently the most expensive (average of $339). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to SJU?

Find hourly flight availability from Seattle to Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 28, 2025.

It’s typically best to fly out from Seattle to San Juan Luis Munoz Marin Intl Airport at noon. Doing so could potentially save you 20% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from Seattle to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Luis Munoz Marin Intl. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to San Juan Luis Munoz Marin Intl Airport flight should consider departing on Thursday at noon when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

What’s the top layover airport for flights from Seattle to San Juan Luis Munoz Marin Intl Airport?

Share of 1-stop round-trip flights from Seattle to San Juan Luis Munoz Marin Intl Airport chosen by Cheapflights users in the past 12 months, using the same layover each way.

Houston (IAH) – chosen by Cheapflights users on 50% of 1-stop itineraries from Seattle to San Juan Luis Munoz Marin Intl Airport on Cheapflights.

What’s the cheapest layover airport for flights from Seattle to San Juan Luis Munoz Marin Intl Airport?

Average round-trip fare for 1-stop flights from Seattle to San Juan Luis Munoz Marin Intl Airport, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $597.

What’s the fastest layover option from Seattle to San Juan Luis Munoz Marin Intl Airport?

Shortest average travel time for 1-stop one-way flights from Seattle to San Juan Luis Munoz Marin Intl Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Houston (IAH) have the shortest average one-way travel time for 1-stop routes: 5h 59m.

Which airport typically offers the quickest layover for flights from Seattle to San Juan Luis Munoz Marin Intl Airport?

Average layover duration for 1-stop one-way flights from Seattle to San Juan Luis Munoz Marin Intl Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 1h 00m.

Reviews of airlines servicing Luis Munoz Marin Intl

Get insights into the airlines that provide service to Luis Munoz Marin Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Luis Munoz Marin Intl. Reviews last updated July 28, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Seattle to San Juan Luis Munoz Marin Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,237 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,971 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,893 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Luis Munoz Marin Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to San Juan Luis Munoz Marin Intl?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to San Juan Luis Munoz Marin Intl. On average, Seattle/Tacoma Intl has 0 outbound flights to San Juan Luis Munoz Marin Intl per day from 9 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • What are the cheapest airlines flying from Seattle to San Juan Luis Munoz Marin Intl Airport round-trip?

    Flying on JetBlue is currently your cheapest option to San Juan Luis Munoz Marin Intl Airport, with prices starting at $362. Additional round-trip tickets that might be worth considering are offered by American Airlines and United Airlines, with the lowest prices starting at $377 and $398, respectively. JetBlue is 38% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Seattle to San Juan Luis Munoz Marin Intl Airport one-way?

    The cheapest airlines for a one-way flight from Seattle to San Juan Luis Munoz Marin Intl Airport are JetBlue ($171), American Airlines ($189), and Frontier ($215).

  • Where are the most common layover locations when flying from Seattle to San Juan Luis Munoz Marin Intl Airport?

    Of the flights from Seattle to San Juan Luis Munoz Marin Intl Airport that have layovers, most of them stop in Dallas. Charlotte follows Dallas in terms of the most common layover location on Seattle to San Juan Luis Munoz Marin Intl Airport flights.

  • What are some popular things to do or see while on a layover in Dallas?

    The majority of Dallas visitors spend their time at American Airlines Center, Dallas World Aquarium, and Dos Equis Pavilion. Travelers on a layover in Dallas can visit American Airlines Center, Dallas World Aquarium, and Dos Equis Pavilion, by traveling 15.0 mi, 15.5 mi, and 18.3 mi, respectively after landing at Dallas/Fort Worth. Those looking to explore during their layover in Dallas can rent a car from Dallas/Fort Worth for about $51 per day.

  • What are some popular points of interest to see during a layover in Charlotte?

    Charlotte travelers tend to visit Carowind, Mint Museum Uptown, and NASCAR Hall of Fame more than any other notable places. Travelers on a layover in Charlotte can visit Carowind, Mint Museum Uptown, and NASCAR Hall of Fame, by traveling 8.2 mi, 5.4 mi, and 5.7 mi, respectively after landing at Charlotte Douglas. Travelers can book a car rental at Charlotte Douglas for about $49 per day to make their sightseeing more efficient.

  • Where are the least popular layover locations for Seattle to San Juan Luis Munoz Marin Intl Airport flights?

    Of the flights from Seattle to San Juan Luis Munoz Marin Intl Airport that have layovers, the fewest flights stop in Atlanta. Atlanta is followed by Miami in terms of the least popular layover location on flights from Seattle to San Juan Luis Munoz Marin Intl Airport.

  • Can I find deals for flights from Seattle to Luis Munoz Marin Intl that include hotel bookings?

    Yes. In addition to deals on Seattle to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Luis Munoz Marin Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Luis Munoz Marin Intl.

  • Can I find deals for business class flights from Seattle to Luis Munoz Marin Intl?

    Yes. Cheapflights offers flight deals from Seattle to Luis Munoz Marin Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, September is the cheapest month in which you can book a flight from Seattle to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from Seattle to San Juan Luis Munoz Marin Intl Airport in June is currently the most expensive (average of $339). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Juan Luis Munoz Marin Intl Airport?

Book flights to San Juan Luis Munoz Marin Intl Airport if you plan to visit one of these locations
Dorado
Fajardo
Luquillo
Rio Grande
Humacao

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Luis Munoz Marin Intl

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Luis Munoz Marin Intl flights
Spokane to Luis Munoz Marin Intl flights
Pasco to Luis Munoz Marin Intl flights

Top 9 airlines flying from Seattle to Luis Munoz Marin Intl

Discover the top 9 airlines that operate flights from Seattle to Luis Munoz Marin Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$175Average$803FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$233Average$341FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$286Average$594FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$336Average$575FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$340Average$564FlexibilityNo cancel feeOn-time69%
DeltaCheapest$368Average$742FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$447Average$885FlexibilityNo cancel feeOn-time83%
Alaska AirlinesCheapest$490Average$851FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$521Average$670FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights