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San Juan

$138+ 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
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to San Juan are usually found in September or October, booked 88 days in advance, depart on a Tuesday or Monday and return on a Tuesday

Cheap 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 October 28, 2025.

Round-trip from

$396
(American Airlines)

One-way from

$138
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$459
From Seattle/Tacoma Intl to San Juan
Search Deals
One-way flight from Seattle/Tacoma Intl to San Juan
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Highest demand for flights based on searches. 5% potential increase in price ($34 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 October 28, 2025.

This United Airlines deal was found by Cheapflights users on 10/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/611:50 pmSEA - SJU
1 stop10h 50mUnited Airlines
Tue 12/92:05 amSJU - SEA
1 stop13h 11mUnited Airlines
Deal found 10/26$396
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/162:22 pmSEA - SJU
2 stops21h 48mFrontier
Sun 11/2310:22 pmSJU - SEA
2 stops17h 34mFrontier
Deal found 10/28$403
This Frontier deal was found by Cheapflights users on 10/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1011:43 amSEA - SJU
2 stops26h 11mFrontier
Wed 11/123:59 amSJU - SEA
2 stops18h 33mFrontier
Deal found 10/26$412
This Frontier deal was found by Cheapflights users on 10/27. 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.
Wed 12/311:25 pmSEA - SJU
2 stops21h 36mFrontier
Sat 1/107:01 pmSJU - SEA
2 stops21h 29mFrontier
Deal found 10/27$413
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/162:22 pmSEA - SJU
2 stops21h 48mFrontier
Tue 11/2510:22 pmSJU - SEA
2 stops17h 34mFrontier
Deal found 10/28$423
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1711:43 amSEA - SJU
2 stops26h 11mFrontier
Mon 11/2410:22 pmSJU - SEA
2 stops17h 34mFrontier
Deal found 10/28$425
This Frontier deal was found by Cheapflights users on 10/27. 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.
Tue 11/111:37 pmSEA - SJU
2 stops17h 42mFrontier
Fri 11/143:59 amSJU - SEA
2 stops18h 33mFrontier
Deal found 10/27$426
This Frontier deal was found by Cheapflights users on 10/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/53:40 pmSEA - SJU
2 stops19h 54mFrontier
Thu 12/114:31 pmSJU - SEA
2 stops20h 15mFrontier
Deal found 10/26$427
This United Airlines deal was found by Cheapflights users on 10/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/58:10 amSEA - SJU
1 stop10h 12mUnited Airlines
Wed 12/102:05 amSJU - SEA
1 stop13h 11mUnited Airlines
Deal found 10/26$429
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/59:45 amSEA - SJU
1 stop10h 50mMultiple Airlines
Wed 12/109:15 amSJU - SEA
2 stops30h 38mMultiple Airlines
Deal found 10/26$431
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/72:25 pmSEA - SJU
2 stops20h 46mMultiple Airlines
Thu 12/111:27 pmSJU - SEA
1 stop23h 19mMultiple Airlines
Deal found 10/26$432
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/201:01 pmSEA - SJU
2 stops18h 26mMultiple Airlines
Sun 11/236:00 amSJU - SEA
1 stop30h 27mMultiple Airlines
Deal found 10/28$440

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 October 28, 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

Sun 12/7

11:00 pm-2:14 pm

1 stop11h 14m

San Juan Luis Munoz Marin Intl

Tue 12/9

3:32 pm-11:58 pm

1 stop12h 26m

$396

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 12/5

8:10 am-10:22 pm

1 stop10h 12m

San Juan Luis Munoz Marin Intl

Wed 12/10

2:05 am-11:16 am

1 stop13h 11m

$429

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 12/6

7:00 am-12:36 am

2 stops13h 36m

San Juan Luis Munoz Marin Intl

Mon 12/8

2:05 am-11:16 am

1 stop13h 11m

$453

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Thu 11/13

6:35 am-10:20 pm

2 stops11h 45m

San Juan Luis Munoz Marin Intl

Wed 11/19

2:05 pm-10:55 pm

2 stops12h 50m

$510

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 12/7

5:00 am-6:25 pm

1 stop9h 25m

San Juan Luis Munoz Marin Intl

Mon 12/15

2:05 am-11:16 am

1 stop13h 11m

$533

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 11/11

9:35 am-12:35 am

2 stops11h 00m

San Juan Luis Munoz Marin Intl

Tue 11/18

11:20 am-10:55 pm

2 stops15h 35m

$543

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 11/14

6:35 am-10:20 pm

2 stops11h 45m

San Juan Luis Munoz Marin Intl

Tue 11/18

11:20 am-9:50 pm

2 stops14h 30m

$557

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 1/12

12:25 pm-1:17 pm

2 stops20h 52m

San Juan Luis Munoz Marin Intl

Tue 1/27

2:05 am-4:01 pm

2 stops17h 56m

$565

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 11/12

9:35 am-12:35 am

2 stops11h 00m

San Juan Luis Munoz Marin Intl

Sat 11/15

11:25 am-9:00 pm

2 stops13h 35m

$591

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 1/9

7:00 am-9:00 pm

1 stop10h 00m

San Juan Luis Munoz Marin Intl

Sun 1/18

2:05 am-11:07 am

1 stop13h 02m

$595

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 19 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 October 24, 2025.

The best time to book flights from Seattle to San Juan is 88 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 $321). Flying from Seattle to San Juan in July is currently the most expensive (average of $479). 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 October 28, 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 October 28, 2025.
See what other customers who have flown with Delta, United Airlines, and American 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.
Delta
7.9
Good
7,994 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,994 reviews
Delta
7.9
Good
7,994 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
9,001 reviews
Delta
7.9
Good
7,994 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
American Airlines
7.2
Good
11,032 reviews
Delta
7.9
Good
7,994 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
JetBlue
7.2
Good
2,908 reviews
Delta
7.9
Good
7,994 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Spirit Airlines
6.3
Okay
8,116 reviews
Delta
7.9
Good
7,994 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 12m. Delta provides one of the quickest options available for as low as $429. 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 $218 and $327 round-trip. Frontier is currently priced 70% below the average price you’ll pay for this route.

  • 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 Charlotte most frequently. Seattle to San Juan flights stop in Dallas the next most.

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

    Most Charlotte visitors opt to spend their time experiencing Carowind, NASCAR Hall of Fame, and Mint Museum Uptown. Travelers on a layover in Charlotte can visit Carowind, NASCAR Hall of Fame, and Mint Museum Uptown, by traveling 8.2 mi, 5.7 mi, and 5.4 mi, respectively after landing at Charlotte Douglas. Travelers can book a car rental at Charlotte Douglas for about $46 per day to make their sightseeing more efficient.

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

    American Airlines Center, Dallas World Aquarium, and Dos Equis Pavilion are currently the most popular points of interest in Dallas at the moment. Those on a layover in Dallas interested in visiting American Airlines Center, Dallas World Aquarium, or Dos Equis Pavilion can do so by traveling 15.0 mi, 15.5 mi, and 18.3 mi, respectively from Dallas/Fort Worth. Those looking to explore during their layover in Dallas can rent a car from Dallas/Fort Worth for about $58 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 $321). Flying from Seattle to San Juan in July is currently the most expensive (average of $479). 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$175Average$698FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$218Average$341FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$327Average$556FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$351Average$575FlexibilityNo cancel feeOn-time71%
DeltaCheapest$357Average$664FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$367Average$586FlexibilityNo cancel feeOn-time69%
Sun Country AirCheapest$447Average$810FlexibilityNo cancel feeOn-time83%
SouthwestCheapest$521Average$695FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$678Average$880FlexibilityNo cancel feeOn-time75%

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