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Cheap flights from Seattle to Porto Alegre from $918

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Porto Alegre departing on 11/13. 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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Travel Warning: Due to flooding, the airport may be currently closed. Check local travel advisories before booking.

Find the cheapest flights from Seattle to Porto Alegre

Cheap round-trip flights

Enter your travel dates to find the best prices.
LATAM Airlines Logo
8:25 am - 12:15 pm
SEA
-
POA
22h 50m
2 stops
LATAM Airlines Logo
7:30 am - 12:09 am
POA
-
SEA
21h 39m
2 stops
$918LATAM Airlines
Fri, Nov 13 - Tue, Nov 17
LATAM Airlines Logo
8:05 am - 12:40 am
SEA
-
POA
36h 35m
2 stops
LATAM Airlines Logo
9:55 pm - 10:02 pm
POA
-
SEA
52h 07m
2 stops
$1,062LATAM Airlines
Sun, Aug 9 - Sun, Aug 16
Multiple Airlines Logo
6:03 am - 6:20 am
SEA
-
POA
20h 17m
2 stops
Multiple Airlines Logo
9:55 pm - 10:09 am
POA
-
SEA
40h 14m
2 stops
$1,131Multiple Airlines
Sun, Aug 9 - Sun, Aug 16
United Airlines Logo
10:52 am - 4:10 pm
SEA
-
POA
24h 18m
2 stops
United Airlines Logo
3:25 pm - 4:27 pm
POA
-
SEA
30h 02m
3 stops
$1,311United Airlines
Fri, Nov 13 - Tue, Nov 17
United Airlines Logo
11:52 pm - 9:45 am
SEA
-
POA
29h 53m
2 stops
United Airlines Logo
4:05 pm - 7:08 pm
POA
-
SEA
31h 03m
3 stops
$1,521United Airlines
Sun, Aug 9 - Sun, Aug 16
Multiple Airlines Logo
9:30 am - 6:50 pm
SEA
-
POA
29h 20m
2 stops
Multiple Airlines Logo
6:30 pm - 8:38 am
POA
-
SEA
42h 08m
3 stops
$1,558Multiple Airlines
Sun, Aug 9 - Sun, Aug 16
Multiple Airlines Logo
5:50 am - 2:20 pm
SEA
-
POA
28h 30m
3 stops
Multiple Airlines Logo
6:30 pm - 8:38 am
POA
-
SEA
42h 08m
3 stops
$1,646Multiple Airlines
Sun, Aug 9 - Sun, Aug 16
Multiple Airlines Logo
5:50 am - 2:20 pm
SEA
-
POA
28h 30m
3 stops
Multiple Airlines Logo
6:30 pm - 8:38 am
POA
-
SEA
42h 08m
3 stops
$1,662Multiple Airlines
Sun, Aug 9 - Sun, Aug 16

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United Airlines flights from Seattle to Porto Alegre

Our best United Airlines deals on Seattle to Porto Alegre flight tickets
United Airlines
Nov 13
SEA10:52 amSeattle/Tacoma Intl
24h 18m
2 stops
POA4:10 pmPorto Alegre Salgado Filho
Nov 17
POA3:25 pmPorto Alegre Salgado Filho
30h 02m
3 stops
SEA4:27 pmSeattle/Tacoma Intl
$1,311
United Airlines
Aug 9
SEA11:52 pmSeattle/Tacoma Intl
29h 53m
2 stops
POA9:45 amPorto Alegre Salgado Filho
Aug 16
POA4:05 pmPorto Alegre Salgado Filho
31h 03m
3 stops
SEA7:08 pmSeattle/Tacoma Intl
$1,521

LATAM Airlines flights from Seattle to Porto Alegre

Our best LATAM Airlines deals on Seattle to Porto Alegre flight tickets
LATAM Airlines
Nov 13
SEA8:25 amSeattle/Tacoma Intl
22h 50m
2 stops
POA12:15 pmPorto Alegre Salgado Filho
Nov 17
POA7:30 amPorto Alegre Salgado Filho
21h 39m
2 stops
SEA12:09 amSeattle/Tacoma Intl
$918
LATAM Airlines
Aug 9
SEA8:05 amSeattle/Tacoma Intl
36h 35m
2 stops
POA12:40 amPorto Alegre Salgado Filho
Aug 16
POA9:55 pmPorto Alegre Salgado Filho
52h 07m
2 stops
SEA10:02 pmSeattle/Tacoma Intl
$1,062

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Porto Alegre 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 June 27, 2026.
Use the filters below to find and compare flights from Seattle to Porto Alegre that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 11/13

8:25 am-12:15 pm

2 stops22h 50m

Porto Alegre Salgado Filho

Tue 11/17

7:30 am-12:09 am

2 stops21h 39m

$918

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 8/9

8:05 am-12:40 am

2 stops36h 35m

Porto Alegre Salgado Filho

Sun 8/16

9:55 pm-10:02 pm

2 stops52h 07m

$1,062

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 8/9

6:03 am-6:20 am

2 stops20h 17m

Porto Alegre Salgado Filho

Sun 8/16

9:55 pm-10:09 am

2 stops40h 14m

$1,131

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 11/13

10:52 am-4:10 pm

2 stops24h 18m

Porto Alegre Salgado Filho

Tue 11/17

3:25 pm-4:27 pm

3 stops30h 02m

$1,311

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 8/9

11:52 pm-9:45 am

2 stops29h 53m

Porto Alegre Salgado Filho

Sun 8/16

4:05 pm-7:08 pm

3 stops31h 03m

$1,521

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 8/9

9:30 am-6:50 pm

2 stops29h 20m

Porto Alegre Salgado Filho

Sun 8/16

6:30 pm-8:38 am

3 stops42h 08m

$1,558

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 8/9

5:50 am-2:20 pm

3 stops28h 30m

Porto Alegre Salgado Filho

Sun 8/16

6:30 pm-8:38 am

3 stops42h 08m

$1,646

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 8/9

5:50 am-2:20 pm

3 stops28h 30m

Porto Alegre Salgado Filho

Sun 8/16

6:30 pm-8:38 am

3 stops42h 08m

$1,662

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Seattle to Porto Alegre

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Porto Alegre according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Porto Alegre (SEA to POA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Porto Alegre

Fastest flight time

20h 17m

Direct flights

None
The fastest flight from Seattle to Porto Alegre takes 20h 17m
There are no direct flights from Seattle to Porto Alegre. There are no popular flight routes from Seattle to Porto Alegre.
Search flight deals

Frequently asked questions about flying from Seattle to Porto Alegre

  • How far is Seattle/Tacoma Intl to Porto Alegre Salgado Filho by plane?

    The distance between Seattle/Tacoma Intl and Porto Alegre Salgado Filho is about 6933.3 mi. In terms of flight time, this usually takes a little over 20h 17m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Porto Alegre Salgado Filho Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Porto Alegre Salgado Filho Airport were last updated today.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Porto Alegre Salgado Filho Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Porto Alegre Salgado Filho Airport?

    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 Porto Alegre Salgado Filho Airport.

  • What documentation or ID do you need to fly to Porto Alegre Salgado Filho Airport?

    The travel and health documents you'll need for your trip to Porto Alegre Salgado Filho Airport 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 Porto Alegre Salgado Filho Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Seattle to Porto Alegre?

Best airlines flying from Seattle to Porto Alegre

Compare and see reviews for airlines that fly from Seattle to Porto Alegre with momondo
Airline
Rating
Free Cancellation
Price
GOLPriceFrom $1,100Free CancellationRating
7.3
1,244 reviews
Search GOL flights

Frequently asked questions about flying from Seattle to Porto Alegre

  • How do I get Price Alerts for flights from Seattle to Porto Alegre?

    Confirm your travel details to search for the latest offers for flights from Seattle to Porto Alegre. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Seattle to Porto Alegre with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Porto Alegre?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Porto Alegre. momondo saves you time and could save you money on your trip.

Can I find flights from Seattle to Porto Alegre with flexible booking policies on momondo?

momondo does allow users to show only those flights to Porto Alegre from Seattle which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Seattle to Porto Alegre?

momondo provides multiple filters to help you find the best flight to Porto Alegre from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Seattle to Porto Alegre flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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