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San Juan

$129+ 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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SJU
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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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 January 29, 2026.

This American Airlines deal was found by Cheapflights users on 1/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:13 pm
SEA
-
SJU
2 stops11h 47m
American Airlines
Tue 3/33:39 pm
SJU
-
SEA
1 stop11h 25m
American Airlines
Deal found 1/28$379
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Wed 2/257:00 am
SEA
-
SJU
1 stop10h 00m
United Airlines
Tue 3/32:05 am
SJU
-
SEA
1 stop13h 09m
United Airlines
Deal found 1/28$384
This American Airlines deal was found by Cheapflights users on 1/27. 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.
Thu 9/245:40 pm
SEA
-
SJU
1 stop17h 23m
American Airlines
Wed 9/302:25 pm
SJU
-
SEA
1 stop11h 26m
American Airlines
Deal found 1/27$389
This United Airlines deal was found by Cheapflights users on 1/29. 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 4/17:00 am
SEA
-
SJU
1 stop10h 34m
United Airlines
Tue 4/141:00 am
SJU
-
SEA
2 stops13h 48m
United Airlines
Deal found 1/29$418
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Sat 2/287:00 am
SEA
-
SJU
2 stops11h 22m
United Airlines
Mon 3/91:05 am
SJU
-
SEA
1 stop13h 05m
United Airlines
Deal found 1/28$419
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/16:25 pm
SEA
-
SJU
2 stops12h 05m
Southwest
Tue 3/105:55 am
SJU
-
SEA
2 stops16h 40m
Southwest
Deal found 1/28$421
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:45 am
SEA
-
SJU
2 stops13h 50m
Southwest
Wed 3/410:20 am
SJU
-
SEA
2 stops15h 30m
Southwest
Deal found 1/28$424
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Sun 3/16:45 am
SEA
-
SJU
1 stop10h 41m
United Airlines
Tue 3/107:05 am
SJU
-
SEA
2 stops14h 58m
United Airlines
Deal found 1/28$432
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:00 am
SEA
-
SJU
2 stops13h 40m
Southwest
Tue 5/55:05 am
SJU
-
SEA
2 stops16h 25m
Southwest
Deal found 1/28$436
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Thu 4/97:00 am
SEA
-
SJU
1 stop10h 34m
United Airlines
Thu 4/161:40 pm
SJU
-
SEA
1 stop10h 26m
United Airlines
Deal found 1/28$438

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 January 29, 2026.

Round-trip from

$379
(American Airlines)

One-way from

$129
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$479
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. 3% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 29, 2026.
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 4/29

8:00 am-9:24 pm

1 stop10h 24m

San Juan Luis Munoz Marin Intl

Tue 5/5

7:20 am-7:00 pm

2 stops14h 40m

$384

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 2/18

7:00 am-9:00 pm

1 stop10h 00m

San Juan Luis Munoz Marin Intl

Wed 2/25

7:40 am-6:03 pm

2 stops14h 23m

$384

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 2/28

11:35 pm-2:40 pm

1 stop11h 05m

San Juan Luis Munoz Marin Intl

Tue 3/10

7:05 am-7:03 pm

2 stops14h 58m

$428

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Thu 4/9

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Thu 4/16

1:40 pm-9:06 pm

1 stop10h 26m

$438

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 5/17

7:00 am-8:34 pm

1 stop10h 34m

San Juan Luis Munoz Marin Intl

Sun 5/24

1:40 pm-10:59 pm

1 stop12h 19m

$449

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 4/18

5:55 pm-11:50 am

2 stops14h 55m

San Juan Luis Munoz Marin Intl

Sat 4/25

7:15 am-10:01 pm

2 stops17h 46m

$470

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 2/22

7:00 am-12:36 am

2 stops13h 36m

San Juan Luis Munoz Marin Intl

Fri 2/27

2:05 am-11:14 am

1 stop13h 09m

$470

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 2/23

6:45 am-9:26 pm

1 stop10h 41m

San Juan Luis Munoz Marin Intl

Wed 2/25

2:05 am-11:14 am

1 stop13h 09m

$474

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 2/21

1:16 pm-2:53 am

2 stops33h 37m

$129

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 2/22

12:00 pm-3:02 pm

2 stops23h 02m

$155

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 17 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 January 23, 2026.

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 $285). Flying from Seattle to San Juan in July is currently the most expensive (average of $477). 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.

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 January 29, 2026.
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
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
8.0
Very good
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
8,127 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
9,215 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
11,206 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
2,891 reviews
Southwest
8.0
Very good
4,267 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

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 24m. United Airlines provides one of the quickest options available for as low as $384. 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 $175 on this airline. Additional options worth looking into are Spirit Airlines and JetBlue, starting at $191 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?

    $170 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 $178 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 Miami 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 Reunion Tower. Travelers on a layover in Dallas can visit American Airlines Center, Dallas World Aquarium, and Reunion Tower, by traveling 15.0 mi, 15.5 mi, and 15.6 mi, respectively after landing at Dallas/Fort Worth. Travelers can book a car rental at Dallas/Fort Worth for about $51 per day to make their sightseeing more efficient.

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

    Kaseya Center, Bayfront Park, and Bayside Marketplace are currently the most popular points of interest in Miami at the moment. Those on a layover in Miami interested in visiting Kaseya Center, Bayfront Park, or Bayside Marketplace can do so by traveling 6.2 mi, 6.4 mi, and 6.4 mi, respectively from Miami. Those looking to explore during their layover in Miami can rent a car from Miami for about $32 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 Charlotte. Seattle to San Juan flights stopping in Atlanta 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 $285). Flying from Seattle to San Juan in July is currently the most expensive (average of $477). 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$175Average$344FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$191Average$341FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$282Average$553FlexibilityNo cancel feeOn-time62%
DeltaCheapest$342Average$605FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$363Average$574FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$363Average$576FlexibilityNo cancel feeOn-time71%
Sun Country AirCheapest$454Average$810FlexibilityNo cancel feeOn-time83%
SouthwestCheapest$521Average$695FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$626Average$880FlexibilityNo cancel feeOn-time75%

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