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Cheap flights from Seattle to San Juan from $100

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 1/11. 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.
Delta Logo
6:05 pm - 1:05 pm
SEA
-
SJU
15h 00m2 stops
Delta Logo
7:00 am - 8:46 pm
SJU
-
SEA
17h 46m2 stops
$363Delta
lun., ene. 12 - mié., ene. 28
American Airlines Logo
6:12 am - 11:56 pm
SEA
-
SJU
13h 44m1 stop
American Airlines Logo
1:58 pm - 8:45 pm
SJU
-
SEA
10h 47m1 stop
$364American Airlines
vie., ene. 9 - jue., ene. 15
American Airlines Logo
5:39 am - 11:32 pm
SEA
-
SJU
13h 53m1 stop
American Airlines Logo
6:33 am - 3:57 pm
SJU
-
SEA
12h 24m1 stop
$365American Airlines
mar., mar. 3 - mié., mar. 11
American Airlines Logo
8:35 am - 10:26 pm
SEA
-
SJU
9h 51m1 stop
American Airlines Logo
8:20 am - 7:04 pm
SJU
-
SEA
14h 44m1 stop
$370American Airlines
jue., ene. 22 - mar., ene. 27
American Airlines Logo
5:39 am - 9:33 pm
SEA
-
SJU
11h 54m2 stops
American Airlines Logo
9:25 am - 10:18 pm
SJU
-
SEA
16h 53m1 stop
$389American Airlines
lun., mar. 2 - mar., mar. 3
American Airlines Logo
8:04 am - 9:39 pm
SEA
-
SJU
9h 35m1 stop
American Airlines Logo
7:00 am - 11:42 pm
SJU
-
SEA
20h 42m1 stop
$394American Airlines
mar., feb. 10 - mar., feb. 17
American Airlines Logo
6:12 am - 11:56 pm
SEA
-
SJU
13h 44m1 stop
American Airlines Logo
8:30 am - 9:08 pm
SJU
-
SEA
16h 38m1 stop
$395American Airlines
vie., ene. 16 - mié., feb. 25
United Airlines Logo
8:10 am - 10:22 pm
SEA
-
SJU
10h 12m1 stop
United Airlines Logo
8:35 am - 9:15 pm
SJU
-
SEA
16h 40m2 stops
$398United Airlines
mié., ene. 14 - mié., ene. 21
Southwest Logo
6:35 am - 12:40 am
SEA
-
SJU
14h 05m2 stops
Southwest Logo
10:20 am - 9:50 pm
SJU
-
SEA
15h 30m2 stops
$417Southwest
lun., mar. 2 - mar., mar. 3
American Airlines Logo
6:00 am - 10:26 pm
SEA
-
SJU
12h 26m2 stops
American Airlines Logo
7:00 am - 11:42 pm
SJU
-
SEA
20h 42m1 stop
$425American Airlines
mar., feb. 10 - mar., feb. 17

Delta flights from Seattle to San Juan

Our best Delta deals on Seattle to San Juan flight tickets
Delta
Jan 12
SEA6:05 pmSeattle/Tacoma Intl
15h 00m
2 stops
SJU1:05 pmSan Juan Luis Munoz Marin Intl
Jan 28
SJU7:00 amSan Juan Luis Munoz Marin Intl
17h 46m
2 stops
SEA8:46 pmSeattle/Tacoma Intl
$363
Find similar
Delta
Jan 9
SEA6:05 pmSeattle/Tacoma Intl
14h 59m
2 stops
SJU1:04 pmSan Juan Luis Munoz Marin Intl
Jan 14
SJU3:20 pmSan Juan Luis Munoz Marin Intl
10h 29m
1 stop
SEA9:49 pmSeattle/Tacoma Intl
$444
Find similar
Delta
Feb 22
SEA6:10 amSeattle/Tacoma Intl
13h 46m
2 stops
SJU11:56 pmSan Juan Luis Munoz Marin Intl
Mar 3
SJU7:00 amSan Juan Luis Munoz Marin Intl
15h 29m
2 stops
SEA6:29 pmSeattle/Tacoma Intl
$523
Find similar

American Airlines flights from Seattle to San Juan

Our best American Airlines deals on Seattle to San Juan flight tickets
American Airlines
Jan 9
SEA6:12 amSeattle/Tacoma Intl
13h 44m
1 stop
SJU11:56 pmSan Juan Luis Munoz Marin Intl
Jan 15
SJU1:58 pmSan Juan Luis Munoz Marin Intl
10h 47m
1 stop
SEA8:45 pmSeattle/Tacoma Intl
$364
Find similar
American Airlines
Mar 3
SEA5:39 amSeattle/Tacoma Intl
13h 53m
1 stop
SJU11:32 pmSan Juan Luis Munoz Marin Intl
Mar 11
SJU6:33 amSan Juan Luis Munoz Marin Intl
12h 24m
1 stop
SEA3:57 pmSeattle/Tacoma Intl
$365
Find similar
American Airlines
Jan 22
SEA8:35 amSeattle/Tacoma Intl
9h 51m
1 stop
SJU10:26 pmSan Juan Luis Munoz Marin Intl
Jan 27
SJU8:20 amSan Juan Luis Munoz Marin Intl
14h 44m
1 stop
SEA7:04 pmSeattle/Tacoma Intl
$370
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 diciembre 16, 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

lun. 1/12

6:05 pm-1:05 pm

2 stops15h 00m

San Juan Luis Munoz Marin Intl

mié. 1/28

7:00 am-8:46 pm

2 stops17h 46m

$363

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

vie. 1/9

6:12 am-11:56 pm

1 stop13h 44m

San Juan Luis Munoz Marin Intl

jue. 1/15

1:58 pm-8:45 pm

1 stop10h 47m

$364

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

mar. 3/3

5:39 am-11:32 pm

1 stop13h 53m

San Juan Luis Munoz Marin Intl

mié. 3/11

6:33 am-3:57 pm

1 stop12h 24m

$365

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

jue. 1/22

8:35 am-10:26 pm

1 stop9h 51m

San Juan Luis Munoz Marin Intl

mar. 1/27

8:20 am-7:04 pm

1 stop14h 44m

$370

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

lun. 3/2

5:39 am-9:33 pm

2 stops11h 54m

San Juan Luis Munoz Marin Intl

mar. 3/3

9:25 am-10:18 pm

1 stop16h 53m

$389

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

mar. 2/10

8:04 am-9:39 pm

1 stop9h 35m

San Juan Luis Munoz Marin Intl

mar. 2/17

7:00 am-11:42 pm

1 stop20h 42m

$394

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

vie. 1/16

6:12 am-11:56 pm

1 stop13h 44m

San Juan Luis Munoz Marin Intl

mié. 2/25

8:30 am-9:08 pm

1 stop16h 38m

$395

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

mié. 1/14

8:10 am-10:22 pm

1 stop10h 12m

San Juan Luis Munoz Marin Intl

mié. 1/21

8:35 am-9:15 pm

2 stops16h 40m

$398

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

lun. 3/2

6:35 am-12:40 am

2 stops14h 05m

San Juan Luis Munoz Marin Intl

mar. 3/3

10:20 am-9:50 pm

2 stops15h 30m

$417

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

mar. 2/10

6:00 am-10:26 pm

2 stops12h 26m

San Juan Luis Munoz Marin Intl

mar. 2/17

7:00 am-11:42 pm

1 stop20h 42m

$425

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 $447.

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 $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 $487 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 31m

Direct flights

None
The fastest flight from Seattle to San Juan takes 9h 31m
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 31m.

  • 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
5.8
3,082 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $214Free CancellationRating
6.3
8,188 reviews
Search Spirit Airlines flights
JetBluePriceFrom $327Free CancellationRating
7.2
2,895 reviews
Search JetBlue flights
DeltaPriceFrom $357Free CancellationRating
7.9
8,008 reviews
Search Delta flights
American AirlinesPriceFrom $363Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
United AirlinesPriceFrom $363Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
SouthwestPriceFrom $521Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
Sun Country AirPriceFrom $544Free CancellationRating
6.9
333 reviews
Search Sun Country Air flights
Alaska AirlinesPriceFrom $678Free CancellationRating
8.0
11,469 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.

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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