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Cheap flights from Seattle to Porto Alegre from $883

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 Porto Alegre departing on 12/20. 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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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.
Multiple Airlines Logo
8:13 am - 5:00 pmSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
28h 47m2 stops Miami Sao Paulo Guarulhos Intl
Multiple Airlines Logo
10:00 pm - 9:55 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
51h 55m2 stops Sao Paulo Guarulhos Intl Miami
$959Multiple Airlines
Fri, Aug 28 - Mon, Sep 7
LATAM Airlines Logo
8:10 am - 4:50 pmSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
27h 40m2 stops Miami Santiago Arturo Merino Benitez
LATAM Airlines Logo
6:00 pm - 2:20 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
25h 20m2 stops Sao Paulo Guarulhos Intl Boston Logan Intl
$997LATAM Airlines
Tue, Nov 17 - Thu, Dec 3
Multiple Airlines Logo
8:13 am - 2:40 pmSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
26h 27m2 stops Miami Sao Paulo Guarulhos Intl
Multiple Airlines Logo
8:05 pm - 9:54 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
29h 49m2 stops Sao Paulo Guarulhos Intl Miami
$1,007Multiple Airlines
Fri, Aug 28 - Wed, Sep 9
LATAM Airlines Logo
8:05 am - 12:40 amSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
36h 35m2 stops Miami Sao Paulo Guarulhos Intl
LATAM Airlines Logo
7:05 pm - 9:55 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
54h 50m3 stops Santiago Arturo Merino Benitez Buenos Aires Ministro Pistarini Miami
$1,051LATAM Airlines
Fri, Aug 28 - Mon, Sep 7
Air Canada Logo
8:40 am - 3:00 pmSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
25h 20m3 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl Sao Paulo Guarulhos Intl
Air Canada Logo
3:25 pm - 8:59 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
34h 34m2 stops Sao Paulo Guarulhos Intl Toronto Pearson Intl
$1,109Air Canada
Tue, Nov 17 - Thu, Dec 3
LATAM Airlines Logo
7:15 am - 5:00 pmSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
29h 45m2 stops Los Angeles Sao Paulo Guarulhos Intl
LATAM Airlines Logo
11:00 am - 12:22 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
29h 22m2 stops Rio de Janeiro–Galeão Intl Atlanta Hartsfield-Jackson
$1,149LATAM Airlines
Thu, Oct 1 - Mon, Oct 5
GOL Logo
11:36 am - 7:00 pmSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
27h 24m2 stops Dallas/Fort Worth Sao Paulo Guarulhos Intl
GOL Logo
2:05 pm - 1:16 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
27h 11m2 stops Sao Paulo Guarulhos Intl Dallas/Fort Worth
$1,196GOL
Sat, Aug 22 - Fri, Sep 4
LATAM Airlines Logo
11:59 pm - 9:20 amSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
29h 21m2 stops Atlanta Hartsfield-Jackson Sao Paulo Guarulhos Intl
LATAM Airlines Logo
7:05 pm - 3:21 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
24h 16m2 stops Santiago Arturo Merino Benitez New York John F Kennedy Intl
$1,225LATAM Airlines
Thu, Oct 1 - Mon, Oct 5
Multiple Airlines Logo
9:30 am - 6:15 pmSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
28h 45m2 stops Mexico City Benito Juarez Santiago Arturo Merino Benitez
Multiple Airlines Logo
5:00 am - 10:17 amPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
33h 17m3 stops Belo Horizonte Tancredo Neves Intl Sao Paulo Guarulhos Intl Orlando
$1,259Multiple Airlines
Fri, Aug 28 - Wed, Sep 9
LATAM Airlines Logo
10:40 pm - 6:20 amSEA  Seattle/Tacoma Intl-POA Porto Alegre Salgado Filho
27h 40m2 stops New York John F Kennedy Intl Lima J Chavez Intl
LATAM Airlines Logo
7:05 pm - 3:21 pmPOA  Porto Alegre Salgado Filho-SEA Seattle/Tacoma Intl
24h 16m2 stops Santiago Arturo Merino Benitez New York John F Kennedy Intl
$1,266LATAM Airlines
Thu, Oct 1 - Mon, Oct 5

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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
Oct 1
SEA12:00 pmSeattle/Tacoma Intl
21h 10m
2 stops
POA1:10 pmPorto Alegre Salgado Filho
Oct 5
POA5:10 pmPorto Alegre Salgado Filho
25h 07m
3 stops
SEA2:17 pmSeattle/Tacoma Intl
$1,575
United Airlines
Oct 1
SEA12:00 pmSeattle/Tacoma Intl
21h 10m
2 stops
POA1:10 pmPorto Alegre Salgado Filho
Oct 5
POA5:10 pmPorto Alegre Salgado Filho
25h 07m
3 stops
SEA2:17 pmSeattle/Tacoma Intl
$1,576
United Airlines
Aug 14
SEA7:00 amSeattle/Tacoma Intl
27h 35m
2 stops
POA2:35 pmPorto Alegre Salgado Filho
Sep 5
POA4:55 pmPorto Alegre Salgado Filho
25h 29m
3 stops
SEA2:24 pmSeattle/Tacoma Intl
$1,637

LATAM Airlines flights from Seattle to Porto Alegre

Our best LATAM Airlines deals on Seattle to Porto Alegre flight tickets
LATAM Airlines
Nov 17
SEA8:10 amSeattle/Tacoma Intl
27h 40m
2 stops
POA4:50 pmPorto Alegre Salgado Filho
Dec 3
POA6:00 pmPorto Alegre Salgado Filho
25h 20m
2 stops
SEA2:20 pmSeattle/Tacoma Intl
$997
LATAM Airlines
Aug 28
SEA8:05 amSeattle/Tacoma Intl
36h 35m
2 stops
POA12:40 amPorto Alegre Salgado Filho
Sep 7
POA7:05 pmPorto Alegre Salgado Filho
54h 50m
3 stops
SEA9:55 pmSeattle/Tacoma Intl
$1,051
LATAM Airlines
Oct 1
SEA7:15 amSeattle/Tacoma Intl
29h 45m
2 stops
POA5:00 pmPorto Alegre Salgado Filho
Oct 5
POA11:00 amPorto Alegre Salgado Filho
29h 22m
2 stops
SEA12:22 pmSeattle/Tacoma Intl
$1,149

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 August 11, 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

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Fri 8/28

8:13 am-5:00 pm

2 stops28h 47m

Porto Alegre Salgado Filho

Mon 9/7

10:00 pm-9:55 pm

2 stops51h 55m

$959

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Tue 11/17

8:10 am-4:50 pm

2 stops27h 40m

Porto Alegre Salgado Filho

Thu 12/3

6:00 pm-2:20 pm

2 stops25h 20m

$997

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Fri 8/28

8:13 am-2:40 pm

2 stops26h 27m

Porto Alegre Salgado Filho

Wed 9/9

8:05 pm-9:54 pm

2 stops29h 49m

$1,007

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Fri 8/28

8:05 am-12:40 am

2 stops36h 35m

Porto Alegre Salgado Filho

Mon 9/7

7:05 pm-9:55 pm

3 stops54h 50m

$1,051

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Tue 11/17

8:40 am-3:00 pm

3 stops25h 20m

Porto Alegre Salgado Filho

Thu 12/3

3:25 pm-8:59 pm

2 stops34h 34m

$1,109

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Thu 10/1

7:15 am-5:00 pm

2 stops29h 45m

Porto Alegre Salgado Filho

Mon 10/5

11:00 am-12:22 pm

2 stops29h 22m

$1,149

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Sat 8/22

11:36 am-7:00 pm

2 stops27h 24m

Porto Alegre Salgado Filho

Fri 9/4

2:05 pm-1:16 pm

2 stops27h 11m

$1,196

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Thu 10/1

11:59 pm-9:20 am

2 stops29h 21m

Porto Alegre Salgado Filho

Mon 10/5

7:05 pm-3:21 pm

2 stops24h 16m

$1,225

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Fri 8/28

9:30 am-6:15 pm

2 stops28h 45m

Porto Alegre Salgado Filho

Wed 9/9

5:00 am-10:17 am

3 stops33h 17m

$1,259
Quickest round-trip

SeattlePorto Alegre

SEA Seattle/Tacoma Intl - POA Porto Alegre Salgado Filho

SEAPOA

Seattle/Tacoma Intl

Thu 10/1

10:40 pm-6:20 am

2 stops27h 40m

Porto Alegre Salgado Filho

Mon 10/5

7:05 pm-3:21 pm

2 stops24h 16m

$1,266

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Seattle to Porto Alegre

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 airline that flies from Seattle/Tacoma Intl to Porto Alegre Salgado Filho?

GOL and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Porto Alegre Salgado Filho

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

21h 10m

Direct flights

None
The fastest flight from Seattle to Porto Alegre takes 21h 10m
There are no direct flights from Seattle to Porto Alegre. There are no popular flight routes from Seattle to Porto Alegre.
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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 21h 10m.

  • 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
1,273 reviews
Search GOL flights

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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.

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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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