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San Juan

$166+ 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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SJU
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 January, booked 55 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 September 11, 2025.

Round-trip from

$363
(American Airlines)

One-way from

$166
(Trip.com)

Popular in

December

Cheapest in

October

Average price

$474
From Seattle/Tacoma Intl to San Juan
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One-way flight from Seattle/Tacoma Intl to San Juan
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Highest demand for flights based on searches. 3% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/9. 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 10/207:37 pmSEA - SJU
2 stops13h 57mUnited Airlines
Wed 10/221:30 pmSJU - SEA
1 stop11h 47mUnited Airlines
Deal found 9/9$363
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Tue 9/307:37 pmSEA - SJU
2 stops13h 57mUnited Airlines
Thu 10/21:05 amSJU - SEA
2 stops13h 26mUnited Airlines
Deal found 9/9$368
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/211:59 pmSEA - SJU
1 stop18h 25mJetBlue
Tue 10/76:00 amSJU - SEA
1 stop19h 36mJetBlue
Deal found 9/10$370
This American Airlines deal was found by Cheapflights users on 9/9. 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.
Mon 10/138:49 pmSEA - SJU
1 stop12h 55mAmerican Airlines
Sun 10/197:00 amSJU - SEA
1 stop19h 35mAmerican Airlines
Deal found 9/9$371
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Tue 9/305:00 amSEA - SJU
1 stop9h 30mUnited Airlines
Tue 10/287:30 amSJU - SEA
2 stops17h 03mUnited Airlines
Deal found 9/9$373
This JetBlue deal was found by Cheapflights users on 9/9. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:59 pmSEA - SJU
1 stop13h 44mJetBlue
Sat 10/41:29 pmSJU - SEA
1 stop11h 55mJetBlue
Deal found 9/9$374
This American Airlines deal was found by Cheapflights users on 9/9. 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 10/18:51 pmSEA - SJU
1 stop18h 24mAmerican Airlines
Tue 10/77:00 amSJU - SEA
2 stops12h 54mAmerican Airlines
Deal found 9/9$380
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1011:40 pmSEA - SJU
1 stop22h 17mJetBlue
Wed 10/156:00 amSJU - SEA
1 stop19h 21mJetBlue
Deal found 9/10$382
This JetBlue deal was found by Cheapflights users on 9/9. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:59 pmSEA - SJU
1 stop13h 44mJetBlue
Fri 10/31:29 pmSJU - SEA
1 stop11h 55mJetBlue
Deal found 9/9$385
This JetBlue deal was found by Cheapflights users on 9/9. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/411:59 pmSEA - SJU
1 stop11h 55mJetBlue
Sat 10/111:25 pmSJU - SEA
1 stop12h 11mJetBlue
Deal found 9/9$391

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 September 11, 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

Wed 10/15

5:00 am-5:30 pm

1 stop9h 30m

San Juan Luis Munoz Marin Intl

Tue 11/11

2:05 am-1:54 pm

2 stops15h 49m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 9/30

5:31 pm-12:00 pm

2 stops15h 29m

San Juan Luis Munoz Marin Intl

Fri 10/3

2:00 pm-9:34 pm

1 stop10h 34m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 11/1

11:59 pm-3:40 pm

1 stop12h 41m

San Juan Luis Munoz Marin Intl

Fri 11/7

2:05 am-11:11 am

1 stop13h 06m

$380

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 10/3

6:55 pm-12:00 pm

2 stops14h 05m

San Juan Luis Munoz Marin Intl

Wed 10/8

1:05 am-10:47 am

1 stop12h 42m

$453

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 10/4

10:54 pm-1:45 pm

1 stop11h 51m

San Juan Luis Munoz Marin Intl

Fri 10/10

1:05 am-10:27 am

1 stop12h 22m

$453

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 10/7

10:45 pm-1:45 pm

1 stop12h 00m

San Juan Luis Munoz Marin Intl

Tue 10/14

1:05 am-2:24 pm

2 stops16h 19m

$453

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 10/25

10:54 pm-1:40 pm

1 stop11h 46m

San Juan Luis Munoz Marin Intl

Tue 11/4

2:05 am-11:11 am

1 stop13h 06m

$453

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 10/6

11:40 pm-4:42 pm

1 stop14h 02m

$171

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 10/19

7:28 pm-1:44 am

3 stops51h 16m

$172

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 10/6

11:56 pm-10:10 pm

1 stop19h 14m

$182

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 13 results
1
2

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 August 29, 2025.

The best time to book flights from Seattle to San Juan is 55 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, September is the cheapest month in which you can book a flight from Seattle to San Juan (average of $254). Flying from Seattle to San Juan 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 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 September 11, 2025.

It’s typically best to fly out from Seattle to San Juan 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?

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 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.

How much does it cost to fly round-trip from Seattle to San Juan?

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 September 11, 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
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
JetBlue
7.2
Good
2,913 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Spirit Airlines
6.3
Okay
8,023 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 9h 30m. United Airlines provides one of the quickest options available for as low as $363. Airlines will cover a distance of 3723 mi.

  • 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 $194 on this airline. Additional options worth looking into are Spirit Airlines and JetBlue, starting at $233 and $326 round-trip. Frontier is currently priced 67% below the average price you’ll pay for this route.

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

    $171 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on American Airlines and Delta, with prices starting from $182 and $182, 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, Mint Museum Uptown, and NASCAR Hall of Fame are currently the most popular points of interest in Charlotte at the moment. Those on a layover in Charlotte interested in visiting Carowind, Mint Museum Uptown, or NASCAR Hall of Fame can do so by traveling 8.2 mi, 5.4 mi, and 5.7 mi, respectively from Charlotte Douglas. Those looking to explore during their layover in Charlotte can rent a car from Charlotte Douglas for about $44 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, September is the cheapest month in which you can book a flight from Seattle to San Juan (average of $254). Flying from Seattle to San Juan 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

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$194Average$796FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$233Average$341FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$326Average$565FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$352Average$586FlexibilityNo cancel feeOn-time71%
DeltaCheapest$360Average$732FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$364Average$578FlexibilityNo cancel feeOn-time69%
Sun Country AirCheapest$447Average$818FlexibilityNo cancel feeOn-time83%
SouthwestCheapest$521Average$695FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$678Average$880FlexibilityNo cancel feeOn-time75%

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