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Cheap flights from Seattle to San Juan from $163

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to San Juan departing on 1/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to San Juan

Cheap round-trip flights

United Airlines Logo
7:30 pm - 12:55 pmSEA-SJU
13h 25m2 stops
United Airlines Logo
2:05 am - 11:07 amSJU-SEA
13h 02m1 stop
$363United Airlines
Find Deal
Mon, Jan 12 - Tue, Jan 27
United Airlines Logo
7:37 pm - 12:34 pmSEA-SJU
13h 57m2 stops
United Airlines Logo
1:05 am - 11:31 amSJU-SEA
13h 26m2 stops
$368United Airlines
Find Deal
Tue, Sep 30 - Thu, Oct 2
JetBlue Logo
11:59 pm - 9:24 pmSEA-SJU
18h 25m1 stop
JetBlue Logo
6:00 am - 10:36 pmSJU-SEA
19h 36m1 stop
$370JetBlue
Find Deal
Thu, Oct 2 - Tue, Oct 7
American Airlines Logo
11:24 pm - 3:54 pmSEA-SJU
13h 30m2 stops
American Airlines Logo
7:00 am - 11:35 pmSJU-SEA
19h 35m1 stop
$371American Airlines
Find Deal
Mon, Oct 13 - Sun, Oct 19
American Airlines Logo
8:49 pm - 3:54 pmSEA-SJU
16h 05m1 stop
American Airlines Logo
7:00 am - 11:35 pmSJU-SEA
19h 35m1 stop
$372American Airlines
Find Deal
Mon, Oct 13 - Sun, Oct 19
United Airlines Logo
5:00 am - 5:30 pmSEA-SJU
9h 30m1 stop
United Airlines Logo
7:30 am - 9:33 pmSJU-SEA
17h 03m2 stops
$373United Airlines
Find Deal
Tue, Sep 30 - Tue, Oct 28
JetBlue Logo
11:59 pm - 4:43 pmSEA-SJU
13h 44m1 stop
JetBlue Logo
1:29 pm - 10:24 pmSJU-SEA
11h 55m1 stop
$374JetBlue
Find Deal
Tue, Sep 23 - Sat, Oct 4
American Airlines Logo
3:57 pm - 4:55 amSEA-SJU
8h 58m1 stop
American Airlines Logo
4:15 pm - 11:07 pmSJU-SEA
10h 52m1 stop
$375American Airlines
Find Deal
Mon, Mar 2 - Tue, Mar 3
Frontier Logo
7:00 am - 11:01 amSEA-SJU
25h 01m2 stops
Frontier Logo
8:00 am - 12:30 amSJU-SEA
19h 30m2 stops
$409Frontier
Find Deal
Wed, Sep 24 - Thu, Oct 2
Southwest Logo
6:35 am - 12:05 amSEA-SJU
13h 30m2 stops
Southwest Logo
7:00 am - 6:40 pmSJU-SEA
15h 40m2 stops
$424Southwest
Find Deal
Mon, Feb 9 - Thu, Feb 19

JetBlue flights from Seattle to San Juan

Our best JetBlue deals on Seattle to San Juan flight tickets
JetBlue
Oct 2
SEA11:59 pmSeattle/Tacoma Intl
18h 25m
1 stop
SJU9:24 pmSan Juan Luis Munoz Marin Intl
Oct 7
SJU6:00 amSan Juan Luis Munoz Marin Intl
19h 36m
1 stop
SEA10:36 pmSeattle/Tacoma Intl
$370
Find similar
JetBlue
Sep 23
SEA11:59 pmSeattle/Tacoma Intl
13h 44m
1 stop
SJU4:43 pmSan Juan Luis Munoz Marin Intl
Oct 4
SJU1:29 pmSan Juan Luis Munoz Marin Intl
11h 55m
1 stop
SEA10:24 pmSeattle/Tacoma Intl
$374
Find similar
JetBlue
Oct 10
SEA11:40 pmSeattle/Tacoma Intl
22h 17m
1 stop
SJU12:57 amSan Juan Luis Munoz Marin Intl
Oct 15
SJU6:00 amSan Juan Luis Munoz Marin Intl
19h 21m
1 stop
SEA10:21 pmSeattle/Tacoma Intl
$382
Find similar

American Airlines flights from Seattle to San Juan

Our best American Airlines deals on Seattle to San Juan flight tickets
American Airlines
Oct 13
SEA11:24 pmSeattle/Tacoma Intl
13h 30m
2 stops
SJU3:54 pmSan Juan Luis Munoz Marin Intl
Oct 19
SJU7:00 amSan Juan Luis Munoz Marin Intl
19h 35m
1 stop
SEA11:35 pmSeattle/Tacoma Intl
$371
Find similar
American Airlines
Oct 13
SEA8:49 pmSeattle/Tacoma Intl
16h 05m
1 stop
SJU3:54 pmSan Juan Luis Munoz Marin Intl
Oct 19
SJU7:00 amSan Juan Luis Munoz Marin Intl
19h 35m
1 stop
SEA11:35 pmSeattle/Tacoma Intl
$372
Find similar
American Airlines
Mar 2
SEA3:57 pmSeattle/Tacoma Intl
8h 58m
1 stop
SJU4:55 amSan Juan Luis Munoz Marin Intl
Mar 3
SJU4:15 pmSan Juan Luis Munoz Marin Intl
10h 52m
1 stop
SEA11:07 pmSeattle/Tacoma Intl
$375
Find similar

momondo 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, momondo users made 832,500 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

Fly to

Route

Depart

Return

Price

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 1/12

7:30 pm-12:55 pm

2 stops13h 25m

San Juan Luis Munoz Marin Intl

Tue 1/27

2:05 am-11:07 am

1 stop13h 02m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 9/30

7:37 pm-12:34 pm

2 stops13h 57m

San Juan Luis Munoz Marin Intl

Thu 10/2

1:05 am-11:31 am

2 stops13h 26m

$368

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Thu 10/2

11:59 pm-9:24 pm

1 stop18h 25m

San Juan Luis Munoz Marin Intl

Tue 10/7

6:00 am-10:36 pm

1 stop19h 36m

$370

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 10/13

11:24 pm-3:54 pm

2 stops13h 30m

San Juan Luis Munoz Marin Intl

Sun 10/19

7:00 am-11:35 pm

1 stop19h 35m

$371

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 10/13

8:49 pm-3:54 pm

1 stop16h 05m

San Juan Luis Munoz Marin Intl

Sun 10/19

7:00 am-11:35 pm

1 stop19h 35m

$372

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 9/30

5:00 am-5:30 pm

1 stop9h 30m

San Juan Luis Munoz Marin Intl

Tue 10/28

7:30 am-9:33 pm

2 stops17h 03m

$373

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 9/23

11:59 pm-4:43 pm

1 stop13h 44m

San Juan Luis Munoz Marin Intl

Sat 10/4

1:29 pm-10:24 pm

1 stop11h 55m

$374

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 3/2

3:57 pm-4:55 am

1 stop8h 58m

San Juan Luis Munoz Marin Intl

Tue 3/3

4:15 pm-11:07 pm

1 stop10h 52m

$375

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 9/24

7:00 am-11:01 am

2 stops25h 01m

San Juan Luis Munoz Marin Intl

Thu 10/2

8:00 am-12:30 am

2 stops19h 30m

$409

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 2/9

6:35 am-12:05 am

2 stops13h 30m

San Juan Luis Munoz Marin Intl

Thu 2/19

7:00 am-6:40 pm

2 stops15h 40m

$424

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Juan from

How to get the cheapest flight ticket from Seattle to San Juan

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Seattle and San Juan?

What is the cheapest month to fly to San Juan?

If you’re not able to fly to San Juan in October, then January is your next best option. Flight prices from Seattle to San Juan during January average around $471.

What is the cheapest day to depart on your flight to San Juan?

The cheapest day to depart from Seattle to San Juan is on a Tuesday when prices can be found for as low as $504. The most expensive day to fly to San Juan is Friday, with ticket prices averaging around $693.

What is the cheapest time of day to depart on your flight to San Juan?

The cheapest time of day to fly to San Juan is at noon when flights can be purchased for as low as $465. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $584 on average. Flights to San Juan from Seattle in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to San Juan?

You are more likely to see cheaper flights to San Juan from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $590 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from Seattle for as low as $484 on momondo.

Cheap Seattle to San Juan flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to San Juan

Direct flights

None
There are no direct flights from Seattle to San Juan. There are no popular flight routes from Seattle to San Juan.
Search flight deals

  • How far is Seattle/Tacoma Intl to San Juan by plane?

    Seattle/Tacoma Intl and San Juan are 3720.7 mi apart from one another. By plane, this route typically takes 8h 58m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to San Juan?

    Prices for flights from Seattle/Tacoma Intl Airport to San Juan were last updated today.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to San Juan?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to San Juan?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to San Juan.

  • What documentation or ID do you need to fly to San Juan?

    The travel and health documents you'll need for your trip to San Juan may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Juan. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Seattle to San Juan

Compare and see reviews for airlines that fly from Seattle to San Juan with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $194Free CancellationRating
5.8
3,177 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $233Free CancellationRating
6.3
8,023 reviews
Search Spirit Airlines flights
JetBluePriceFrom $326Free CancellationRating
7.2
2,913 reviews
Search JetBlue flights
American AirlinesPriceFrom $352Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $360Free CancellationRating
7.9
7,960 reviews
Search Delta flights
United AirlinesPriceFrom $364Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
Sun Country AirPriceFrom $447Free CancellationRating
6.9
330 reviews
Search Sun Country Air flights
SouthwestPriceFrom $521Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $678Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to San Juan?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to San Juan. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to San Juan with flexible booking policies on momondo?

All flight searches from Seattle to San Juan on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to San Juan?

momondo helps you find the best flight between Seattle and San Juan by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Seattle to San Juan right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to San Juan from Seattle. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your San Juan trip

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Find better results for your trip to Puerto Rico

Fly into one of these airports located in San Juan

Airports listed have a maximum distance of 7.1 mi from San Juan
San Juan Isla Grande Airport
San Juan Luis Munoz Marin Intl Airport