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Cheap flights from Seattle to San Juan from $127

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 12/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
11:12 pm - 3:59 pmSEA-SJU
12h 47m2 stops
American Airlines Logo
9:25 am - 10:01 pmSJU-SEA
16h 36m1 stop
$397American Airlines
Find Deal
vie., ene. 16 - mié., feb. 25
United Airlines Logo
5:00 am - 9:00 pmSEA-SJU
12h 00m2 stops
United Airlines Logo
8:10 am - 6:14 pmSJU-SEA
14h 04m2 stops
$401United Airlines
Find Deal
lun., ene. 12 - mar., ene. 20
Frontier Logo
2:22 pm - 4:10 pmSEA-SJU
21h 48m2 stops
Frontier Logo
10:22 pm - 11:56 amSJU-SEA
17h 34m2 stops
$403Frontier
Find Deal
dom., nov. 16 - dom., nov. 23
Frontier Logo
1:01 pm - 9:40 amSEA-SJU
16h 39m2 stops
Frontier Logo
4:31 pm - 8:46 amSJU-SEA
20h 15m2 stops
$405Frontier
Find Deal
jue., nov. 27 - jue., dic. 4
Multiple Airlines Logo
9:45 am - 12:35 amSEA-SJU
10h 50m1 stop
Multiple Airlines Logo
7:10 am - 11:53 amSJU-SEA
32h 43m2 stops
$407Multiple Airlines
Find Deal
vie., dic. 5 - sáb., dic. 13
Frontier Logo
2:22 pm - 3:19 pmSEA-SJU
20h 57m2 stops
Frontier Logo
10:39 pm - 12:13 pmSJU-SEA
17h 34m2 stops
$408Frontier
Find Deal
vie., nov. 14 - dom., nov. 16
United Airlines Logo
5:00 am - 10:22 pmSEA-SJU
13h 22m2 stops
United Airlines Logo
2:05 am - 11:07 amSJU-SEA
13h 02m1 stop
$415United Airlines
Find Deal
mié., ene. 28 - sáb., feb. 7
Southwest Logo
6:45 am - 12:35 amSEA-SJU
13h 50m2 stops
Southwest Logo
12:10 pm - 10:30 pmSJU-SEA
14h 20m2 stops
$429Southwest
Find Deal
mié., ene. 14 - mié., ene. 21
American Airlines Logo
12:59 am - 3:13 pmSEA-SJU
10h 14m1 stop
American Airlines Logo
9:25 am - 10:01 pmSJU-SEA
16h 36m1 stop
$443American Airlines
Find Deal
mar., feb. 17 - mar., feb. 24
Southwest Logo
6:35 am - 12:35 amSEA-SJU
14h 00m2 stops
Southwest Logo
11:20 am - 10:55 pmSJU-SEA
15h 35m2 stops
$474Southwest
Find Deal
jue., dic. 4 - mié., dic. 10

American Airlines flights from Seattle to San Juan

Our best American Airlines deals on Seattle to San Juan flight tickets
American Airlines
Jan 16
SEA11:12 pmSeattle/Tacoma Intl
12h 47m
2 stops
SJU3:59 pmSan Juan Luis Munoz Marin Intl
Feb 25
SJU9:25 amSan Juan Luis Munoz Marin Intl
16h 36m
1 stop
SEA10:01 pmSeattle/Tacoma Intl
$397
Find similar
American Airlines
Feb 17
SEA12:59 amSeattle/Tacoma Intl
10h 14m
1 stop
SJU3:13 pmSan Juan Luis Munoz Marin Intl
Feb 24
SJU9:25 amSan Juan Luis Munoz Marin Intl
16h 36m
1 stop
SEA10:01 pmSeattle/Tacoma Intl
$443
Find similar
American Airlines
Jan 13
SEA7:35 amSeattle/Tacoma Intl
10h 51m
1 stop
SJU10:26 pmSan Juan Luis Munoz Marin Intl
Jan 18
SJU6:30 amSan Juan Luis Munoz Marin Intl
19h 37m
1 stop
SEA10:07 pmSeattle/Tacoma Intl
$459
Find similar

Frontier flights from Seattle to San Juan

Our best Frontier deals on Seattle to San Juan flight tickets
Frontier
Nov 16
SEA2:22 pmSeattle/Tacoma Intl
21h 48m
2 stops
SJU4:10 pmSan Juan Luis Munoz Marin Intl
Nov 23
SJU10:22 pmSan Juan Luis Munoz Marin Intl
17h 34m
2 stops
SEA11:56 amSeattle/Tacoma Intl
$403
Find similar
Frontier
Nov 27
SEA1:01 pmSeattle/Tacoma Intl
16h 39m
2 stops
SJU9:40 amSan Juan Luis Munoz Marin Intl
Dec 4
SJU4:31 pmSan Juan Luis Munoz Marin Intl
20h 15m
2 stops
SEA8:46 amSeattle/Tacoma Intl
$405
Find similar
Frontier
Nov 14
SEA2:22 pmSeattle/Tacoma Intl
20h 57m
2 stops
SJU3:19 pmSan Juan Luis Munoz Marin Intl
Nov 16
SJU10:39 pmSan Juan Luis Munoz Marin Intl
17h 34m
2 stops
SEA12:13 pmSeattle/Tacoma Intl
$408
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 octubre 30, 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

vie. 1/16

11:12 pm-3:59 pm

2 stops12h 47m

San Juan Luis Munoz Marin Intl

mié. 2/25

9:25 am-10:01 pm

1 stop16h 36m

$397

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

lun. 1/12

5:00 am-9:00 pm

2 stops12h 00m

San Juan Luis Munoz Marin Intl

mar. 1/20

8:10 am-6:14 pm

2 stops14h 04m

$401

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

dom. 11/16

2:22 pm-4:10 pm

2 stops21h 48m

San Juan Luis Munoz Marin Intl

dom. 11/23

10:22 pm-11:56 am

2 stops17h 34m

$403

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

jue. 11/27

1:01 pm-9:40 am

2 stops16h 39m

San Juan Luis Munoz Marin Intl

jue. 12/4

4:31 pm-8:46 am

2 stops20h 15m

$405

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

vie. 12/5

9:45 am-12:35 am

1 stop10h 50m

San Juan Luis Munoz Marin Intl

sáb. 12/13

7:10 am-11:53 am

2 stops32h 43m

$407

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

vie. 11/14

2:22 pm-3:19 pm

2 stops20h 57m

San Juan Luis Munoz Marin Intl

dom. 11/16

10:39 pm-12:13 pm

2 stops17h 34m

$408

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

mié. 1/28

5:00 am-10:22 pm

2 stops13h 22m

San Juan Luis Munoz Marin Intl

sáb. 2/7

2:05 am-11:07 am

1 stop13h 02m

$415

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

mié. 1/14

6:45 am-12:35 am

2 stops13h 50m

San Juan Luis Munoz Marin Intl

mié. 1/21

12:10 pm-10:30 pm

2 stops14h 20m

$429

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

mar. 2/17

12:59 am-3:13 pm

1 stop10h 14m

San Juan Luis Munoz Marin Intl

mar. 2/24

9:25 am-10:01 pm

1 stop16h 36m

$443

SeattleSan Juan

SEA - SJU

SEASJU

Seattle/Tacoma Intl

jue. 12/4

6:35 am-12:35 am

2 stops14h 00m

San Juan Luis Munoz Marin Intl

mié. 12/10

11:20 am-10:55 pm

2 stops15h 35m

$474

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 September, then October is your next best option. Flight prices from Seattle to San Juan during October average around $459.

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 $588 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 $520 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 9h 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
5.8
3,122 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $218Free CancellationRating
6.3
8,116 reviews
Search Spirit Airlines flights
JetBluePriceFrom $327Free CancellationRating
7.2
2,906 reviews
Search JetBlue flights
American AirlinesPriceFrom $351Free CancellationRating
7.2
11,035 reviews
Search American Airlines flights
DeltaPriceFrom $357Free CancellationRating
7.9
7,998 reviews
Search Delta flights
United AirlinesPriceFrom $367Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights
Sun Country AirPriceFrom $447Free CancellationRating
6.9
335 reviews
Search Sun Country Air flights
SouthwestPriceFrom $521Free CancellationRating
8.0
4,243 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $678Free CancellationRating
8.0
11,217 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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1 adult
sáb. 11/29
sáb. 12/6
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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