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Cheap flights from Seattle to San Juan from $145

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 4/20. 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
1 adult, Economy, 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.
Southwest Logo
10:30 pm - 12:50 pm
SEA
-
SJU
11h 20m
1 stop
Southwest Logo
1:45 pm - 11:35 pm
SJU
-
SEA
12h 50m
2 stops
$454Southwest
Tue, Aug 25 - Tue, Sep 1
American Airlines Logo
6:19 pm - 9:13 am
SEA
-
SJU
11h 54m
2 stops
American Airlines Logo
6:45 am - 10:47 pm
SJU
-
SEA
19h 02m
1 stop
$455American Airlines
Sat, Apr 25 - Sat, May 2
Multiple Airlines Logo
1:34 pm - 5:59 pm
SEA
-
SJU
49h 25m
2 stops
Multiple Airlines Logo
6:09 pm - 9:49 am
SJU
-
SEA
42h 40m
3 stops
$456Multiple Airlines
Wed, Apr 29 - Thu, May 14
American Airlines Logo
6:00 am - 8:51 pm
SEA
-
SJU
11h 51m
1 stop
American Airlines Logo
11:59 pm - 9:35 am
SJU
-
SEA
12h 36m
1 stop
$460American Airlines
Wed, Apr 29 - Wed, May 6
American Airlines Logo
6:00 am - 8:51 pm
SEA
-
SJU
11h 51m
1 stop
American Airlines Logo
6:00 am - 9:23 pm
SJU
-
SEA
18h 23m
1 stop
$469American Airlines
Wed, Apr 29 - Thu, May 14
American Airlines Logo
6:00 am - 8:51 pm
SEA
-
SJU
11h 51m
1 stop
American Airlines Logo
7:25 am - 9:04 pm
SJU
-
SEA
16h 39m
1 stop
$470American Airlines
Wed, Apr 29 - Thu, May 14
Delta Logo
11:14 pm - 12:52 pm
SEA
-
SJU
10h 38m
1 stop
Delta Logo
2:35 pm - 12:12 am
SJU
-
SEA
12h 37m
2 stops
$474Delta
Fri, May 1 - Thu, May 7
American Airlines Logo
1:03 pm - 9:39 am
SEA
-
SJU
17h 36m
1 stop
American Airlines Logo
1:47 pm - 10:58 pm
SJU
-
SEA
12h 11m
1 stop
$475American Airlines
Tue, May 26 - Tue, Jun 2
American Airlines Logo
7:31 am - 11:39 pm
SEA
-
SJU
13h 08m
1 stop
American Airlines Logo
2:56 pm - 12:08 am
SJU
-
SEA
12h 12m
1 stop
$479American Airlines
Wed, May 27 - Mon, Jun 1
American Airlines Logo
6:00 am - 11:59 pm
SEA
-
SJU
14h 59m
1 stop
American Airlines Logo
1:47 pm - 10:58 pm
SJU
-
SEA
12h 11m
1 stop
$482American Airlines
Fri, May 29 - Tue, Jun 2

American Airlines flights from Seattle to San Juan

Our best American Airlines deals on Seattle to San Juan flight tickets
American Airlines
Apr 25
SEA6:19 pmSeattle/Tacoma Intl
11h 54m
2 stops
SJU9:13 amSan Juan Luis Munoz Marin Intl
May 2
SJU6:45 amSan Juan Luis Munoz Marin Intl
19h 02m
1 stop
SEA10:47 pmSeattle/Tacoma Intl
$455
American Airlines
Apr 29
SEA6:00 amSeattle/Tacoma Intl
11h 51m
1 stop
SJU8:51 pmSan Juan Luis Munoz Marin Intl
May 6
SJU11:59 pmSan Juan Luis Munoz Marin Intl
12h 36m
1 stop
SEA9:35 amSeattle/Tacoma Intl
$460
American Airlines
Apr 29
SEA6:00 amSeattle/Tacoma Intl
11h 51m
1 stop
SJU8:51 pmSan Juan Luis Munoz Marin Intl
May 14
SJU6:00 amSan Juan Luis Munoz Marin Intl
18h 23m
1 stop
SEA9:23 pmSeattle/Tacoma Intl
$469

United Airlines flights from Seattle to San Juan

Our best United Airlines deals on Seattle to San Juan flight tickets
United Airlines
Apr 17
SEA7:05 pmSeattle/Tacoma Intl
13h 59m
2 stops
SJU12:04 pmSan Juan Luis Munoz Marin Intl
Apr 24
SJU2:55 pmSan Juan Luis Munoz Marin Intl
11h 17m
1 stop
SEA11:12 pmSeattle/Tacoma Intl
$501
United Airlines
Apr 15
SEA6:30 amSeattle/Tacoma Intl
11h 08m
1 stop
SJU8:38 pmSan Juan Luis Munoz Marin Intl
Apr 30
SJU1:00 amSan Juan Luis Munoz Marin Intl
13h 39m
2 stops
SEA11:39 amSeattle/Tacoma Intl
$523
United Airlines
Apr 14
SEA5:00 amSeattle/Tacoma Intl
15h 50m
2 stops
SJU11:50 pmSan Juan Luis Munoz Marin Intl
Apr 21
SJU1:00 amSan Juan Luis Munoz Marin Intl
18h 04m
2 stops
SEA4:04 pmSeattle/Tacoma Intl
$526

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 March 23, 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

Cheapest round-trip

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 8/25

10:30 pm-12:50 pm

1 stop11h 20m

San Juan Luis Munoz Marin Intl

Tue 9/1

1:45 pm-11:35 pm

2 stops12h 50m

$454

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Sat 4/25

6:19 pm-9:13 am

2 stops11h 54m

San Juan Luis Munoz Marin Intl

Sat 5/2

6:45 am-10:47 pm

1 stop19h 02m

$455

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 4/29

1:34 pm-5:59 pm

2 stops49h 25m

San Juan Luis Munoz Marin Intl

Thu 5/14

6:09 pm-9:49 am

3 stops42h 40m

$456

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 4/29

6:00 am-8:51 pm

1 stop11h 51m

San Juan Luis Munoz Marin Intl

Wed 5/6

11:59 pm-9:35 am

1 stop12h 36m

$460

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 4/29

6:00 am-8:51 pm

1 stop11h 51m

San Juan Luis Munoz Marin Intl

Thu 5/14

6:00 am-9:23 pm

1 stop18h 23m

$469

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 4/29

6:00 am-8:51 pm

1 stop11h 51m

San Juan Luis Munoz Marin Intl

Thu 5/14

7:25 am-9:04 pm

1 stop16h 39m

$470
Quickest round-trip

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 5/1

11:14 pm-12:52 pm

1 stop10h 38m

San Juan Luis Munoz Marin Intl

Thu 5/7

2:35 pm-12:12 am

2 stops12h 37m

$474

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Tue 5/26

1:03 pm-9:39 am

1 stop17h 36m

San Juan Luis Munoz Marin Intl

Tue 6/2

1:47 pm-10:58 pm

1 stop12h 11m

$475

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Wed 5/27

7:31 am-11:39 pm

1 stop13h 08m

San Juan Luis Munoz Marin Intl

Mon 6/1

2:56 pm-12:08 am

1 stop12h 12m

$479

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

Fri 5/29

6:00 am-11:59 pm

1 stop14h 59m

San Juan Luis Munoz Marin Intl

Tue 6/2

1:47 pm-10:58 pm

1 stop12h 11m

$482

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 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 $465.

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 $578 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 $506 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

9h 37m

Direct flights

None
The fastest flight from Seattle to San Juan takes 9h 37m
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 9h 37m.

  • 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
3,018 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $218Free CancellationRating
6.3
8,537 reviews
Search Spirit Airlines flights
DeltaPriceFrom $224Free CancellationRating
7.9
8,319 reviews
Search Delta flights
JetBluePriceFrom $282Free CancellationRating
7.2
2,909 reviews
Search JetBlue flights
United AirlinesPriceFrom $363Free CancellationRating
7.4
9,459 reviews
Search United Airlines flights
American AirlinesPriceFrom $363Free CancellationRating
7.1
11,488 reviews
Search American Airlines flights
Sun Country AirPriceFrom $454Free CancellationRating
6.8
340 reviews
Search Sun Country Air flights
SouthwestPriceFrom $521Free CancellationRating
8.0
4,324 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $598Free CancellationRating
7.9
12,096 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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Wed 4/22
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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