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Porto Alegre

$447+ Cheap flights from Seattle (SEA) to Porto Alegre (POA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — POA
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap flight deals from Seattle to Porto Alegre

Cheapest flights from Seattle to Porto Alegre
Explore the most affordable flight options available from Seattle to Porto Alegre. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.

This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:45 am
SEA
-
POA
2 stops31h 45m
United Airlines
Wed 4/15:10 pm
POA
-
SEA
2 stops35h 09m
United Airlines
Deal found 2/10$856
This Orbitz deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2510:40 pm
SEA
-
POA
2 stops34h 25m
Multiple Airlines
Tue 3/316:05 pm
POA
-
SEA
2 stops55h 43m
Multiple Airlines
Deal found 2/10$903
This Orbitz deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2510:20 pm
SEA
-
POA
2 stops34h 45m
LATAM Airlines
Tue 3/316:05 pm
POA
-
SEA
2 stops55h 43m
LATAM Airlines
Deal found 2/10$908
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/611:59 pm
SEA
-
POA
2 stops34h 26m
United Airlines
Fri 3/205:10 pm
POA
-
SEA
2 stops31h 46m
United Airlines
Deal found 2/7$932
This KAYAK deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2511:45 am
SEA
-
POA
2 stops20h 15m
GOL
Wed 4/15:10 pm
POA
-
SEA
2 stops34h 30m
GOL
Deal found 2/10$992
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2512:43 pm
SEA
-
POA
3 stops44h 37m
United Airlines
Wed 4/15:10 pm
POA
-
SEA
2 stops33h 27m
United Airlines
Deal found 2/10$1,059
This Gotogate deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/258:00 am
SEA
-
POA
2 stops26h 50m
Multiple Airlines
Wed 4/16:05 pm
POA
-
SEA
3 stops24h 58m
Multiple Airlines
Deal found 2/10$1,130
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2512:43 pm
SEA
-
POA
3 stops46h 37m
United Airlines
Tue 3/315:10 pm
POA
-
SEA
2 stops29h 50m
United Airlines
Deal found 2/10$1,152
This Booking.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/255:40 am
SEA
-
POA
3 stops29h 10m
Air Canada
Wed 4/16:05 pm
POA
-
SEA
3 stops24h 58m
Air Canada
Deal found 2/10$1,158
This FlightHub deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/2311:45 am
SEA
-
POA
2 stops23h 45m
GOL
Tue 3/318:20 pm
POA
-
SEA
2 stops55h 20m
GOL
Deal found 2/10$1,160

Find flight deals from Seattle to Porto Alegre

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Porto Alegre (POA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 11, 2026.

Most accurate provider

Ovago
2 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$856
(United Airlines)

One-way from

$447
(Kiwi.com)
Provider with most accurate pricing for Seattle/Tacoma Intl-Porto Alegre Salgado Filho flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Porto Alegre Salgado Filho flights.
Search Deals
From Seattle/Tacoma Intl to Porto Alegre Salgado Filho
Search Deals
One-way flight from Seattle/Tacoma Intl to Porto Alegre Salgado Filho
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Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from Seattle to Porto Alegre that are best for you.

Fly from

Seattle

Fly to

Porto Alegre

Route

Depart

Return

Price

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 3/25

6:45 am-6:30 pm

2 stops31h 45m

Porto Alegre Salgado Filho

Wed 4/1

5:10 pm-12:19 am

2 stops35h 09m

$856

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 2/25

10:40 pm-2:05 pm

2 stops34h 25m

Porto Alegre Salgado Filho

Tue 3/31

6:05 pm-9:48 pm

2 stops55h 43m

$903

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 2/25

10:20 pm-2:05 pm

2 stops34h 45m

Porto Alegre Salgado Filho

Tue 3/31

6:05 pm-9:48 pm

2 stops55h 43m

$908

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 3/6

11:59 pm-3:25 pm

2 stops34h 26m

Porto Alegre Salgado Filho

Fri 3/20

5:10 pm-8:56 pm

2 stops31h 46m

$932

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 2/25

11:45 am-1:00 pm

2 stops20h 15m

Porto Alegre Salgado Filho

Wed 4/1

5:10 pm-11:40 pm

2 stops34h 30m

$992

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 2/25

12:43 pm-2:20 pm

3 stops44h 37m

Porto Alegre Salgado Filho

Wed 4/1

5:10 pm-10:37 pm

2 stops33h 27m

$1,059

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 2/25

12:43 pm-4:20 pm

3 stops46h 37m

Porto Alegre Salgado Filho

Tue 3/31

5:10 pm-7:00 pm

2 stops29h 50m

$1,152

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 3/25

5:40 am-2:50 pm

3 stops29h 10m

Porto Alegre Salgado Filho

Wed 4/1

6:05 pm-3:03 pm

3 stops24h 58m

$1,158

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Mon 2/23

11:45 am-4:30 pm

2 stops23h 45m

Porto Alegre Salgado Filho

Tue 3/31

8:20 pm-11:40 pm

2 stops55h 20m

$1,160

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Mon 6/1

9:25 am-9:40 am

3 stops44h 15m

$447

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

Showing 1-10 of 12 results
1
2
  • Most accurate provider: When it comes to deals on Seattle-Porto Alegre flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Seattle-Porto Alegre flight deals on Cheapflights vs. Ovago 90-95% of the time. Price accuracy is based on data collected from Seattle-Porto Alegre flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Porto Alegre flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Porto Alegre flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Porto Alegre

Have a flexible travel schedule? Discover the best time to fly to Porto Alegre from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Porto Alegre. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Porto Alegre?

    United Airlines, LATAM Airlines, and GOL can get you from Seattle to Porto Alegre in just under 20h 15m. Your travel time can differ by up to 14h 30m. Seattle and Porto Alegre are separated by a distance of 6926 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from Seattle to Porto Alegre that include hotel bookings?

    Yes. In addition to deals on Seattle to Porto Alegre flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Porto Alegre?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Porto Alegre.

  • Can I find deals for business class flights from Seattle to Porto Alegre?

    Yes. Cheapflights offers flight deals from Seattle to Porto Alegre by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for Seattle to Porto Alegre

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Portland to Porto Alegre flights

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