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Cheap flights from Seattle to Porto Alegre from $943

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 8/13. 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
0 bags
Travel Warning: Due to flooding, the airport may be currently closed. Check local travel advisories before booking.

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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
8:00 am - 6:15 pm
SEA
-
POA
30h 15m
2 stops
LATAM Airlines Logo
7:05 pm - 10:05 pm
POA
-
SEA
31h 00m
2 stops
$943LATAM Airlines
Thu, Aug 13 - Mon, Aug 17
LATAM Airlines Logo
7:15 am - 5:00 pm
SEA
-
POA
29h 45m
2 stops
LATAM Airlines Logo
7:05 pm - 10:05 pm
POA
-
SEA
31h 00m
2 stops
$999LATAM Airlines
Thu, Aug 13 - Mon, Aug 17
LATAM Airlines Logo
8:25 am - 5:00 pm
SEA
-
POA
28h 35m
2 stops
LATAM Airlines Logo
7:05 pm - 9:59 pm
POA
-
SEA
30h 54m
2 stops
$1,000LATAM Airlines
Wed, Sep 23 - Sun, Sep 27
Multiple Airlines Logo
10:23 am - 3:35 pm
SEA
-
POA
25h 12m
2 stops
Multiple Airlines Logo
8:55 pm - 11:56 am
POA
-
SEA
43h 01m
2 stops
$1,145Multiple Airlines
Tue, Jun 23 - Tue, Jun 30
United Airlines Logo
7:00 am - 4:20 pm
SEA
-
POA
29h 20m
2 stops
United Airlines Logo
5:10 pm - 7:07 pm
POA
-
SEA
29h 57m
3 stops
$1,528United Airlines
Thu, Aug 13 - Mon, Aug 17
United Airlines Logo
7:00 am - 9:45 am
SEA
-
POA
22h 45m
2 stops
United Airlines Logo
5:10 pm - 7:07 pm
POA
-
SEA
29h 57m
3 stops
$1,578United Airlines
Thu, Aug 13 - Mon, Aug 17
United Airlines Logo
8:50 am - 2:35 pm
SEA
-
POA
25h 45m
3 stops
United Airlines Logo
4:05 pm - 2:49 pm
POA
-
SEA
26h 44m
2 stops
$1,627United Airlines
Wed, Sep 23 - Sun, Sep 27
United Airlines Logo
7:00 am - 9:45 am
SEA
-
POA
22h 45m
2 stops
United Airlines Logo
5:10 pm - 7:07 pm
POA
-
SEA
29h 57m
3 stops
$1,640United Airlines
Thu, Aug 13 - Mon, Aug 17
United Airlines Logo
10:29 am - 2:20 pm
SEA
-
POA
23h 51m
3 stops
United Airlines Logo
5:10 pm - 11:38 am
POA
-
SEA
22h 28m
2 stops
$1,892United Airlines
Tue, Jun 23 - Tue, Jun 30
United Airlines Logo
7:00 am - 2:35 pm
SEA
-
POA
27h 35m
2 stops
United Airlines Logo
4:05 pm - 7:14 pm
POA
-
SEA
31h 09m
3 stops
$2,118United Airlines
Wed, Sep 23 - Sun, Sep 27

LATAM Airlines flights from Seattle to Porto Alegre

Our best LATAM Airlines deals on Seattle to Porto Alegre flight tickets
LATAM Airlines
Aug 13
SEA7:15 amSeattle/Tacoma Intl
29h 45m
2 stops
POA5:00 pmPorto Alegre Salgado Filho
Aug 17
POA7:05 pmPorto Alegre Salgado Filho
31h 00m
2 stops
SEA10:05 pmSeattle/Tacoma Intl
$999
LATAM Airlines
Sep 23
SEA8:25 amSeattle/Tacoma Intl
28h 35m
2 stops
POA5:00 pmPorto Alegre Salgado Filho
Sep 27
POA7:05 pmPorto Alegre Salgado Filho
30h 54m
2 stops
SEA9:59 pmSeattle/Tacoma Intl
$1,000

United Airlines flights from Seattle to Porto Alegre

Our best United Airlines deals on Seattle to Porto Alegre flight tickets
United Airlines
Sep 23
SEA8:10 amSeattle/Tacoma Intl
26h 25m
2 stops
POA2:35 pmPorto Alegre Salgado Filho
Sep 27
POA4:05 pmPorto Alegre Salgado Filho
31h 09m
3 stops
SEA7:14 pmSeattle/Tacoma Intl
$1,390
United Airlines
Aug 13
SEA7:00 amSeattle/Tacoma Intl
29h 20m
2 stops
POA4:20 pmPorto Alegre Salgado Filho
Aug 17
POA5:10 pmPorto Alegre Salgado Filho
29h 57m
3 stops
SEA7:07 pmSeattle/Tacoma Intl
$1,528
United Airlines
Aug 13
SEA7:00 amSeattle/Tacoma Intl
22h 45m
2 stops
POA9:45 amPorto Alegre Salgado Filho
Aug 17
POA5:10 pmPorto Alegre Salgado Filho
29h 57m
3 stops
SEA7:07 pmSeattle/Tacoma Intl
$1,578

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 May 10, 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 - POA

SEAPOA

Seattle/Tacoma Intl

Thu 8/13

8:00 am-6:15 pm

2 stops30h 15m

Porto Alegre Salgado Filho

Mon 8/17

7:05 pm-10:05 pm

2 stops31h 00m

$943

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 8/13

7:15 am-5:00 pm

2 stops29h 45m

Porto Alegre Salgado Filho

Mon 8/17

7:05 pm-10:05 pm

2 stops31h 00m

$999

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 9/23

8:25 am-5:00 pm

2 stops28h 35m

Porto Alegre Salgado Filho

Sun 9/27

7:05 pm-9:59 pm

2 stops30h 54m

$1,000

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 6/23

10:23 am-3:35 pm

2 stops25h 12m

Porto Alegre Salgado Filho

Tue 6/30

8:55 pm-11:56 am

2 stops43h 01m

$1,145

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 8/13

7:00 am-4:20 pm

2 stops29h 20m

Porto Alegre Salgado Filho

Mon 8/17

5:10 pm-7:07 pm

3 stops29h 57m

$1,528

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 8/13

7:00 am-9:45 am

2 stops22h 45m

Porto Alegre Salgado Filho

Mon 8/17

5:10 pm-7:07 pm

3 stops29h 57m

$1,578

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 9/23

8:50 am-2:35 pm

3 stops25h 45m

Porto Alegre Salgado Filho

Sun 9/27

4:05 pm-2:49 pm

2 stops26h 44m

$1,627

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 8/13

7:00 am-9:45 am

2 stops22h 45m

Porto Alegre Salgado Filho

Mon 8/17

5:10 pm-7:07 pm

3 stops29h 57m

$1,640
Quickest round-trip

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 6/23

10:29 am-2:20 pm

3 stops23h 51m

Porto Alegre Salgado Filho

Tue 6/30

5:10 pm-11:38 am

2 stops22h 28m

$1,892

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 9/23

7:00 am-2:35 pm

2 stops27h 35m

Porto Alegre Salgado Filho

Sun 9/27

4:05 pm-7:14 pm

3 stops31h 09m

$2,118

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

22h 45m

Direct flights

None
The fastest flight from Seattle to Porto Alegre takes 22h 45m
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 22h 45m.

  • 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 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.

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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