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Cheap flights from Seattle to Porto Alegre from $861

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 5/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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.
Multiple Airlines Logo
10:45 pm - 12:40 am
SEA
-
POA
21h 55m
2 stops
Multiple Airlines Logo
12:10 pm - 8:10 pm
POA
-
SEA
36h 00m
2 stops
$861Multiple Airlines
Tue, May 5 - Tue, May 12
United Airlines Logo
8:10 am - 3:15 pm
SEA
-
POA
27h 05m
2 stops
United Airlines Logo
3:30 pm - 7:44 pm
POA
-
SEA
32h 14m
2 stops
$1,348United Airlines
Wed, May 6 - Wed, May 13
United Airlines Logo
8:10 am - 4:20 pm
SEA
-
POA
28h 10m
2 stops
United Airlines Logo
3:30 pm - 2:36 pm
POA
-
SEA
27h 06m
3 stops
$1,438United Airlines
Tue, May 5 - Tue, May 12
United Airlines Logo
1:07 pm - 3:15 pm
SEA
-
POA
22h 08m
2 stops
United Airlines Logo
3:30 pm - 2:36 pm
POA
-
SEA
27h 06m
3 stops
$1,483United Airlines
Wed, May 6 - Wed, May 13
American Airlines Logo
10:25 am - 12:15 pm
SEA
-
POA
21h 50m
3 stops
American Airlines Logo
6:25 pm - 2:08 pm
POA
-
SEA
23h 43m
3 stops
$3,285American Airlines
Tue, May 5 - Tue, May 12
LATAM Airlines Logo
9:55 pm - 6:15 am
SEA
-
POA
28h 20m
2 stops
LATAM Airlines Logo
7:05 pm - 9:59 pm
POA
-
SEA
30h 54m
2 stops
$5,081LATAM Airlines
Tue, Sep 1 - Tue, Sep 15

United Airlines flights from Seattle to Porto Alegre

Our best United Airlines deals on Seattle to Porto Alegre flight tickets
United Airlines
May 6
SEA8:10 amSeattle/Tacoma Intl
27h 05m
2 stops
POA3:15 pmPorto Alegre Salgado Filho
May 13
POA3:30 pmPorto Alegre Salgado Filho
32h 14m
2 stops
SEA7:44 pmSeattle/Tacoma Intl
$1,348
United Airlines
May 5
SEA8:10 amSeattle/Tacoma Intl
28h 10m
2 stops
POA4:20 pmPorto Alegre Salgado Filho
May 12
POA3:30 pmPorto Alegre Salgado Filho
27h 06m
3 stops
SEA2:36 pmSeattle/Tacoma Intl
$1,438
United Airlines
May 6
SEA1:07 pmSeattle/Tacoma Intl
22h 08m
2 stops
POA3:15 pmPorto Alegre Salgado Filho
May 13
POA3:30 pmPorto Alegre Salgado Filho
27h 06m
3 stops
SEA2:36 pmSeattle/Tacoma Intl
$1,483

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 March 23, 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

Tue 5/5

10:45 pm-12:40 am

2 stops21h 55m

Porto Alegre Salgado Filho

Tue 5/12

12:10 pm-8:10 pm

2 stops36h 00m

$861

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 5/6

8:10 am-3:15 pm

2 stops27h 05m

Porto Alegre Salgado Filho

Wed 5/13

3:30 pm-7:44 pm

2 stops32h 14m

$1,348

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 5/5

8:10 am-4:20 pm

2 stops28h 10m

Porto Alegre Salgado Filho

Tue 5/12

3:30 pm-2:36 pm

3 stops27h 06m

$1,438

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 5/6

1:07 pm-3:15 pm

2 stops22h 08m

Porto Alegre Salgado Filho

Wed 5/13

3:30 pm-2:36 pm

3 stops27h 06m

$1,483
Quickest round-trip

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 5/5

10:25 am-12:15 pm

3 stops21h 50m

Porto Alegre Salgado Filho

Tue 5/12

6:25 pm-2:08 pm

3 stops23h 43m

$3,285

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 9/1

9:55 pm-6:15 am

2 stops28h 20m

Porto Alegre Salgado Filho

Tue 9/15

7:05 pm-9:59 pm

2 stops30h 54m

$5,081

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

21h 55m

Direct flights

None
The fastest flight from Seattle to Porto Alegre takes 21h 55m
There are no direct flights from Seattle to Porto Alegre. There are no popular flight routes from Seattle to Porto Alegre.
Search flight deals

  • 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 55m.

  • 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.

  • 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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