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$102+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SJU
May 5 — May 121
Mon 5/5
Mon 5/12
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 76 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 April 30, 2025.

Round-trip from

$357
(American Airlines)

One-way from

$102
(eDestinos)

Popular in

December

Cheapest in

September

Average price

$590
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. 6% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 30, 2025.

This Delta deal was found by Cheapflights users on 4/27. 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.
Sat 11/19:20 pmSEA - SJU
1 stop12h 27mDelta
Sat 11/83:28 pmSJU - SEA
1 stop10h 57mDelta
Deal found 4/27$357
This FlightHub deal was found by Cheapflights users on 4/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/233:20 pmSEA - SJU
2 stops20h 10mSpirit Airlines
Thu 5/2912:36 pmSJU - SEA
2 stops14h 34mSpirit Airlines
Deal found 4/28$360
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:55 pmSEA - SJU
2 stops13h 25mAmerican Airlines
Tue 9/3011:55 amSJU - SEA
2 stops14h 01mAmerican Airlines
Deal found 4/29$367
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Tue 5/2710:15 pmSEA - SJU
1 stop11h 19mUnited Airlines
Tue 6/37:45 amSJU - SEA
1 stop11h 35mUnited Airlines
Deal found 4/29$376
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2311:59 pmSEA - SJU
1 stop10h 48mMultiple Airlines
Wed 5/281:33 amSJU - SEA
2 stops25h 37mMultiple Airlines
Deal found 4/28$403
This JetBlue deal was found by Cheapflights users on 4/29. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1311:10 pmSEA - SJU
1 stop12h 46mJetBlue
Fri 6/2011:00 amSJU - SEA
1 stop11h 58mJetBlue
Deal found 4/29$460
This Southwest deal was found by Cheapflights users on 4/28. 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.
Thu 7/38:05 amSEA - SJU
2 stops12h 00mSouthwest
Tue 7/86:30 amSJU - SEA
1 stop14h 10mSouthwest
Deal found 4/28$461
This Sun Country Air deal was found by Cheapflights users on 4/28. 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 6/277:15 pmSEA - SJU
1 stop17h 01mSun Country Air
Sat 7/54:20 pmSJU - SEA
1 stop18h 42mSun Country Air
Deal found 4/28$549

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 April 30, 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

Sat 9/20

5:50 pm-2:19 pm

1 stop17h 29m

San Juan Luis Munoz Marin Intl

Sat 9/27

3:58 pm-12:33 am

1 stop11h 35m

$357

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 5/23

3:20 pm-2:30 pm

2 stops20h 10m

San Juan Luis Munoz Marin Intl

Thu 5/29

12:36 pm-12:10 am

2 stops14h 34m

$360

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 5/27

10:15 pm-12:34 pm

1 stop11h 19m

San Juan Luis Munoz Marin Intl

Tue 6/3

7:45 am-4:20 pm

1 stop11h 35m

$376

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 5/23

11:59 pm-1:47 pm

1 stop10h 48m

San Juan Luis Munoz Marin Intl

Wed 5/28

1:33 am-12:10 am

2 stops25h 37m

$403

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 6/13

11:10 pm-2:56 pm

1 stop12h 46m

San Juan Luis Munoz Marin Intl

Fri 6/20

11:00 am-7:58 pm

1 stop11h 58m

$460

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Thu 7/3

9:10 pm-12:40 pm

1 stop12h 30m

San Juan Luis Munoz Marin Intl

Tue 7/8

6:30 am-5:40 pm

1 stop14h 10m

$461

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Thu 5/29

7:00 pm-1:16 pm

2 stops15h 16m

San Juan Luis Munoz Marin Intl

Thu 6/5

12:50 pm-11:49 pm

1 stop13h 59m

$476

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 6/27

7:15 pm-3:16 pm

1 stop17h 01m

San Juan Luis Munoz Marin Intl

Sat 7/5

4:20 pm-8:02 am

1 stop18h 42m

$549

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 5/18

6:00 am-11:31 am

2 stops26h 31m

$102

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 9/29

11:00 pm-2:47 pm

1 stop12h 47m

$184

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 16 results
1
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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 April 25, 2025.

The best time to book flights from Seattle to San Juan is 76 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 December is currently the most expensive (average of $336). 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 April 30, 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.

Rainfall in San Juan by month

Plan your trip to San Juan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit San Juan when rainfall is around 2.2 in.

Temperature in San Juan by month

Plan your trip to San Juan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

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 April 30, 2025.
To help decide which airline to fly from Seattle to San Juan, see what other customers have to say about Alaska Airlines, Southwest and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Southwest
8.0
Very good
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
JetBlue
7.3
Good
2,922 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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.

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

    Our cheapest airline available from Seattle to San Juan is American Airlines. Our recent data shows that you can find tickets from as low as $357 on this airline. Additional options worth looking into are Spirit Airlines and United Airlines, starting at $360 and $376 round-trip. American Airlines is currently priced 36% below the average price you’ll pay for this route.

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

    $102 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on Sun Country Air and American Airlines, with prices starting from $217 and $219, 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 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 $58 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 $55 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 December is currently the most expensive (average of $336). 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$233Average$346FlexibilityNo cancel feeOn-time65%
FrontierCheapest$250Average$584FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$286Average$521FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$327Average$553FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$340Average$568FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$425Average$815FlexibilityNo cancel feeOn-time75%
Sun Country AirCheapest$447Average$882FlexibilityNo cancel feeOn-time83%
DeltaCheapest$452Average$719FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$565Average$695FlexibilityNo cancel feeOn-time63%

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