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Cheap flights from Seattle to San Juan from $139

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 2/26. 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

Enter your travel dates to find the best prices.
American Airlines Logo
10:08 pm - 3:03 pm
SEA
-
SJU
12h 55m
1 stop
American Airlines Logo
5:25 pm - 12:24 am
SJU
-
SEA
10h 59m
1 stop
$379American Airlines
Mon, Mar 2 - Tue, Mar 3
American Airlines Logo
11:57 pm - 3:49 pm
SEA
-
SJU
11h 52m
2 stops
American Airlines Logo
5:25 pm - 12:24 am
SJU
-
SEA
10h 59m
1 stop
$384American Airlines
Sun, Feb 22 - Tue, Mar 3
Southwest Logo
6:45 am - 12:35 am
SEA
-
SJU
13h 50m
2 stops
Southwest Logo
10:20 am - 9:50 pm
SJU
-
SEA
15h 30m
2 stops
$424Southwest
Wed, Feb 25 - Wed, Mar 4
United Airlines Logo
7:29 pm - 1:17 pm
SEA
-
SJU
13h 48m
2 stops
United Airlines Logo
2:05 am - 11:14 am
SJU
-
SEA
13h 09m
1 stop
$426United Airlines
Sat, Feb 21 - Fri, Feb 27
United Airlines Logo
11:59 pm - 2:44 pm
SEA
-
SJU
11h 45m
1 stop
United Airlines Logo
1:40 pm - 10:59 pm
SJU
-
SEA
12h 19m
1 stop
$427United Airlines
Mon, Apr 27 - Mon, May 4
United Airlines Logo
7:00 am - 12:36 am
SEA
-
SJU
13h 36m
2 stops
United Airlines Logo
3:25 pm - 10:41 pm
SJU
-
SEA
11h 16m
1 stop
$428United Airlines
Tue, Mar 3 - Sat, Mar 7
American Airlines Logo
6:13 pm - 10:00 am
SEA
-
SJU
11h 47m
2 stops
American Airlines Logo
1:58 pm - 11:04 pm
SJU
-
SEA
13h 06m
2 stops
$439American Airlines
Mon, Mar 2 - Tue, Mar 3
United Airlines Logo
7:00 am - 8:34 pm
SEA
-
SJU
10h 34m
1 stop
United Airlines Logo
1:40 pm - 9:06 pm
SJU
-
SEA
10h 26m
1 stop
$442United Airlines
Thu, Apr 9 - Thu, Apr 16
American Airlines Logo
6:00 am - 8:39 pm
SEA
-
SJU
10h 39m
1 stop
American Airlines Logo
4:10 pm - 12:24 am
SJU
-
SEA
12h 14m
1 stop
$444American Airlines
Wed, Feb 18 - Wed, Mar 4
United Airlines Logo
7:00 am - 8:34 pm
SEA
-
SJU
10h 34m
1 stop
United Airlines Logo
1:25 pm - 11:46 pm
SJU
-
SEA
13h 21m
1 stop
$447United Airlines
Thu, Apr 9 - Thu, Apr 16

United Airlines flights from Seattle to San Juan

Our best United Airlines deals on Seattle to San Juan flight tickets
United Airlines
Feb 21
SEA7:29 pmSeattle/Tacoma Intl
13h 48m
2 stops
SJU1:17 pmSan Juan Luis Munoz Marin Intl
Feb 27
SJU2:05 amSan Juan Luis Munoz Marin Intl
13h 09m
1 stop
SEA11:14 amSeattle/Tacoma Intl
$426
United Airlines
Apr 27
SEA11:59 pmSeattle/Tacoma Intl
11h 45m
1 stop
SJU2:44 pmSan Juan Luis Munoz Marin Intl
May 4
SJU1:40 pmSan Juan Luis Munoz Marin Intl
12h 19m
1 stop
SEA10:59 pmSeattle/Tacoma Intl
$427
United Airlines
Mar 3
SEA7:00 amSeattle/Tacoma Intl
13h 36m
2 stops
SJU12:36 amSan Juan Luis Munoz Marin Intl
Mar 7
SJU3:25 pmSan Juan Luis Munoz Marin Intl
11h 16m
1 stop
SEA10:41 pmSeattle/Tacoma Intl
$428

American Airlines flights from Seattle to San Juan

Our best American Airlines deals on Seattle to San Juan flight tickets
American Airlines
Mar 2
SEA6:13 pmSeattle/Tacoma Intl
11h 47m
2 stops
SJU10:00 amSan Juan Luis Munoz Marin Intl
Mar 3
SJU5:25 pmSan Juan Luis Munoz Marin Intl
10h 59m
1 stop
SEA12:24 amSeattle/Tacoma Intl
$379
American Airlines
Feb 22
SEA11:57 pmSeattle/Tacoma Intl
11h 52m
2 stops
SJU3:49 pmSan Juan Luis Munoz Marin Intl
Mar 3
SJU5:25 pmSan Juan Luis Munoz Marin Intl
10h 59m
1 stop
SEA12:24 amSeattle/Tacoma Intl
$384
American Airlines
Mar 2
SEA6:13 pmSeattle/Tacoma Intl
11h 47m
2 stops
SJU10:00 amSan Juan Luis Munoz Marin Intl
Mar 3
SJU1:58 pmSan Juan Luis Munoz Marin Intl
13h 06m
2 stops
SEA11:04 pmSeattle/Tacoma Intl
$439

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 January 28, 2026.
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 3/2

10:08 pm-3:03 pm

1 stop12h 55m

San Juan Luis Munoz Marin Intl

Tue 3/3

5:25 pm-12:24 am

1 stop10h 59m

$379

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sun 2/22

11:57 pm-3:49 pm

2 stops11h 52m

San Juan Luis Munoz Marin Intl

Tue 3/3

5:25 pm-12:24 am

1 stop10h 59m

$384

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 2/25

6:45 am-12:35 am

2 stops13h 50m

San Juan Luis Munoz Marin Intl

Wed 3/4

10:20 am-9:50 pm

2 stops15h 30m

$424

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 2/21

7:29 pm-1:17 pm

2 stops13h 48m

San Juan Luis Munoz Marin Intl

Fri 2/27

2:05 am-11:14 am

1 stop13h 09m

$426

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 4/27

11:59 pm-2:44 pm

1 stop11h 45m

San Juan Luis Munoz Marin Intl

Mon 5/4

1:40 pm-10:59 pm

1 stop12h 19m

$427

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 3/3

7:00 am-12:36 am

2 stops13h 36m

San Juan Luis Munoz Marin Intl

Sat 3/7

3:25 pm-10:41 pm

1 stop11h 16m

$428

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Mon 3/2

6:13 pm-10:00 am

2 stops11h 47m

San Juan Luis Munoz Marin Intl

Tue 3/3

1:58 pm-11:04 pm

2 stops13h 06m

$439

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

$442

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 2/18

6:00 am-8:39 pm

1 stop10h 39m

San Juan Luis Munoz Marin Intl

Wed 3/4

4:10 pm-12:24 am

1 stop12h 14m

$444

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

1:25 pm-11:46 pm

1 stop13h 21m

$447

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 September is your next best option. Flight prices from Seattle to San Juan during September average around $474.

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 $580 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 $498 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

Fastest flight time

10h 25m

Direct flights

None
The fastest flight from Seattle to San Juan takes 10h 25m
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 10h 25m.

  • 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 $175Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $191Free CancellationRating
6.3
8,390 reviews
Search Spirit Airlines flights
JetBluePriceFrom $282Free CancellationRating
7.2
2,892 reviews
Search JetBlue flights
DeltaPriceFrom $342Free CancellationRating
7.9
8,125 reviews
Search Delta flights
United AirlinesPriceFrom $363Free CancellationRating
7.4
9,216 reviews
Search United Airlines flights
American AirlinesPriceFrom $363Free CancellationRating
7.2
11,206 reviews
Search American Airlines flights
Sun Country AirPriceFrom $454Free CancellationRating
6.9
343 reviews
Search Sun Country Air flights
SouthwestPriceFrom $521Free CancellationRating
8.0
4,267 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $626Free CancellationRating
8.0
11,805 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