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San Juan

$131+ Cheap flights from Seattle (SEA) to San Juan

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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SJU
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to San Juan are usually found in October or September, booked 47 days in advance, depart on a Tuesday or Monday and return on a Tuesday

Cheap flight deals from Seattle to San Juan

Cheapest flights from Seattle to San Juan
Explore the most affordable flight options available from Seattle to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

This American Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/316:00 amSEA - SJU
1 stop11h 51mAmerican Airlines
Wed 1/148:20 amSJU - SEA
1 stop14h 44mAmerican Airlines
Deal found 12/10$363
This United Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/3111:15 pmSEA - SJU
1 stop10h 02mUnited Airlines
Wed 1/147:45 amSJU - SEA
2 stops14h 42mUnited Airlines
Deal found 12/10$461
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:34 pmSEA - SJU
1 stop17h 39mMultiple Airlines
Wed 1/147:15 amSJU - SEA
2 stops31h 54mMultiple Airlines
Deal found 12/10$472
This Southwest deal was found by Cheapflights users on 12/11. 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.
Wed 12/315:15 amSEA - SJU
2 stops15h 20mSouthwest
Wed 1/1410:20 amSJU - SEA
2 stops15h 30mSouthwest
Deal found 12/11$508
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:34 pmSEA - SJU
1 stop17h 39mMultiple Airlines
Sun 1/117:05 pmSJU - SEA
2 stops28h 42mMultiple Airlines
Deal found 12/10$571
This American Airlines deal was found by Cheapflights users on 12/11. 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.
Wed 12/3110:16 amSEA - SJU
1 stop9h 11mAmerican Airlines
Sat 1/106:00 amSJU - SEA
2 stops15h 45mAmerican Airlines
Deal found 12/11$637
This Delta deal was found by Cheapflights users on 12/10. 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.
Mon 12/2912:55 amSEA - SJU
1 stop10h 34mDelta
Wed 1/143:20 pmSJU - SEA
1 stop10h 29mDelta
Deal found 12/10$647
This eDestinos deal was found by Cheapflights users on 12/10. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:46 pmSEA - SJU
2 stops37h 53mMultiple Airlines
Tue 12/303:14 pmSJU - SEA
2 stops45h 40mMultiple Airlines
Deal found 12/10$657
This American Airlines deal was found by Cheapflights users on 12/10. 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 12/302:52 pmSEA - SJU
1 stop10h 08mAmerican Airlines
Sun 1/117:07 amSJU - SEA
1 stop20h 44mAmerican Airlines
Deal found 12/10$674
This American Airlines deal was found by Cheapflights users on 12/10. 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 12/166:15 amSEA - SJU
1 stop11h 54mAmerican Airlines
Thu 12/257:00 amSJU - SEA
1 stop18h 11mAmerican Airlines
Deal found 12/10$678

Find flight deals from Seattle to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to San Juan (PR1). 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 December 12, 2025.

Round-trip from

$363
(Delta)

One-way from

$131
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$797
From Seattle/Tacoma Intl to San Juan
Search Deals
One-way flight from Seattle/Tacoma Intl to San Juan
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($28 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to San Juan 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 December 12, 2025.
Use the filters below to find and compare flights from Seattle to San Juan that are best for you.

Fly from

Seattle

Fly to

San Juan

Route

Depart

Return

Price

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 2/20

6:05 am-11:58 pm

1 stop13h 53m

San Juan Luis Munoz Marin Intl

Wed 2/25

7:00 am-8:46 pm

2 stops17h 46m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 4/25

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Tue 4/28

1:00 am-11:00 am

1 stop13h 00m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 2/22

11:15 pm-2:00 pm

1 stop10h 45m

San Juan Luis Munoz Marin Intl

Wed 2/25

6:15 am-2:18 pm

1 stop12h 03m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 5/1

11:00 pm-12:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Mon 5/4

1:00 am-11:39 am

2 stops13h 39m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 2/21

6:05 am-11:58 pm

1 stop13h 53m

San Juan Luis Munoz Marin Intl

Wed 2/25

7:00 am-8:46 pm

2 stops17h 46m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 1/24

7:00 pm-1:05 pm

2 stops14h 05m

San Juan Luis Munoz Marin Intl

Tue 2/3

7:00 am-8:46 pm

2 stops17h 46m

$373

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 1/25

11:10 pm-2:10 pm

1 stop11h 00m

San Juan Luis Munoz Marin Intl

Wed 2/4

7:00 am-8:46 pm

2 stops17h 46m

$373

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 1/27

6:15 am-8:58 pm

1 stop10h 43m

San Juan Luis Munoz Marin Intl

Wed 2/4

7:00 am-8:46 pm

2 stops17h 46m

$373

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 1/21

7:10 am-11:57 pm

1 stop12h 47m

San Juan Luis Munoz Marin Intl

Thu 2/5

3:55 pm-11:15 pm

1 stop11h 20m

$373

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 3/23

10:59 pm-12:07 pm

1 stop10h 08m

San Juan Luis Munoz Marin Intl

Tue 3/31

7:00 am-6:30 pm

2 stops14h 30m

$373

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 22 results
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Best time to book a flight from Seattle to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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

How far ahead should I book a flight from Seattle to San Juan?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to San Juan. Price data was last updated on December 5, 2025.

The best time to book flights from Seattle to San Juan is 47 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to San Juan?

Currently, March is the cheapest month in which you can book a flight from Seattle to San Juan (average of $309). Flying from Seattle to San Juan in July is currently the most expensive (average of $476). 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 San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 12, 2025.

It’s typically best to fly out from Seattle to San Juan at noon. Doing so could potentially save you 53% 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?

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

Travelers seeking maximum savings on their Seattle to San Juan flight should consider departing on Sunday 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.

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated December 12, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Seattle to San Juan have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,008 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,095 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,050 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
JetBlue
7.2
Good
2,899 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Seattle to San Juan. 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?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to San Juan from Seattle. Booking flights from Seattle/Tacoma Intl (SEA) to San Juan should be relatively easy as there are 0 daily outbound flights to San Juan from 9 different airlines.

  • How long is the flight from Seattle to San Juan?

    A quick flight from Seattle to San Juan can take about 10h 34m. Delta provides one of the quickest options available for as low as $363. Airlines will cover a distance of 3723 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to San Juan round-trip?

    Our cheapest airline available from Seattle to San Juan is Frontier. Our recent data shows that you can find tickets from as low as $175 on this airline. Additional options worth looking into are Spirit Airlines and JetBlue, starting at $214 and $282 round-trip. Frontier is currently priced 69% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Seattle to San Juan one-way?

    $168 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on JetBlue and United Airlines, with prices starting from $170 and $202, respectively.

  • Where are the most common layover locations when flying from Seattle to San Juan?

    Flights departing from Seattle and landing in San Juan layover in Dallas most frequently. Seattle to San Juan flights stop in Charlotte the next most.

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

    Most Dallas visitors opt to spend their time experiencing 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. Travelers can book a car rental at Dallas/Fort Worth for about $50 per day to make their sightseeing more efficient.

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

    Carowind, NASCAR Hall of Fame, and Mint Museum Uptown are currently the most popular points of interest in Charlotte at the moment. Those on a layover in Charlotte interested in visiting Carowind, NASCAR Hall of Fame, or Mint Museum Uptown can do so by traveling 8.2 mi, 5.7 mi, and 5.4 mi, respectively from Charlotte Douglas. Those looking to explore during their layover in Charlotte can rent a car from Charlotte Douglas for about $49 per day.

  • Where are the least popular layover locations for Seattle to San Juan flights?

    Of the flights from Seattle to San Juan that have layovers, the fewest flights stop in Atlanta. Seattle to San Juan flights stopping in Miami are the next rarest.

  • Can I find deals for flights from Seattle to San Juan that include hotel bookings?

    Yes. In addition to deals on Seattle to San Juan flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to San Juan?

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

  • Can I find deals for business class flights from Seattle to San Juan?

    Yes. Cheapflights offers flight deals from Seattle to San Juan 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?

    Currently, March is the cheapest month in which you can book a flight from Seattle to San Juan (average of $309). Flying from Seattle to San Juan in July is currently the most expensive (average of $476). 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

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Top 9 airlines flying from Seattle to San Juan

Discover the top 9 airlines that operate flights from Seattle to San Juan. 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$175Average$476FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$214Average$341FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$327Average$550FlexibilityNo cancel feeOn-time62%
DeltaCheapest$342Average$626FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$362Average$575FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$363Average$572FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$521Average$695FlexibilityNo cancel feeOn-time63%
Sun Country AirCheapest$544Average$828FlexibilityNo cancel feeOn-time83%
Alaska AirlinesCheapest$678Average$880FlexibilityNo cancel feeOn-time75%

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