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Porto Alegre

$729+ Cheap flights from Seattle (SEA) to Porto Alegre (POA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — POA
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap 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 September 17, 2025.

Round-trip from

$729
(United Airlines)
From Seattle/Tacoma Intl to Porto Alegre Salgado Filho
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Find 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 September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 11/111:59 pmSEA - POA
2 stops36h 21mUnited Airlines
Sat 11/83:45 pmPOA - SEA
2 stops23h 05mUnited Airlines
Deal found 9/17$729
This United Airlines deal was found by Cheapflights users on 9/17. 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 10/34:35 pmSEA - POA
2 stops41h 55mUnited Airlines
Tue 10/73:25 pmPOA - SEA
2 stops28h 20mUnited Airlines
Deal found 9/17$830
This Gotogate deal was found by Cheapflights users on 9/17. 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.
Sat 11/15:50 amSEA - POA
3 stops34h 20mAir Canada
Sat 11/83:45 pmPOA - SEA
3 stops27h 46mAir Canada
Deal found 9/17$1,195
This Copa Airlines deal was found by Cheapflights users on 9/17. 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 Copa Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/112:41 pmSEA - POA
2 stops31h 49mCopa Airlines
Fri 11/71:35 amPOA - SEA
2 stops25h 55mCopa Airlines
Deal found 9/17$1,343
This Mytrip deal was found by Cheapflights users on 9/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/310:00 amSEA - POA
3 stops25h 05mMultiple Airlines
Tue 10/73:25 pmPOA - SEA
2 stops23h 34mMultiple Airlines
Deal found 9/17$1,530
This Ovago deal was found by Cheapflights users on 9/16. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1812:43 pmSEA - POA
2 stops24h 02mGOL
Sat 1/35:20 pmPOA - SEA
2 stops23h 10mGOL
Deal found 9/16$2,056
This oojo deal was found by Cheapflights users on 9/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/188:05 amSEA - POA
2 stops22h 30mMultiple Airlines
Sat 1/38:10 pmPOA - SEA
2 stops43h 30mMultiple Airlines
Deal found 9/17$2,214
This Copa Airlines deal was found by Cheapflights users on 9/16. 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 Copa Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/185:05 pmSEA - POA
2 stops26h 25mCopa Airlines
Fri 1/21:45 amPOA - SEA
2 stops27h 12mCopa Airlines
Deal found 9/16$2,956
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 12/187:10 amSEA - POA
2 stops26h 25mUnited Airlines
Sat 1/34:55 pmPOA - SEA
3 stops30h 11mUnited Airlines
Deal found 9/16$7,898

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 September 17, 2025.
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

Sat 11/1

11:59 pm-4:20 pm

2 stops36h 21m

Porto Alegre Salgado Filho

Sat 11/8

3:45 pm-9:50 am

2 stops23h 05m

$729

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 10/3

4:35 pm-2:30 pm

2 stops41h 55m

Porto Alegre Salgado Filho

Tue 10/7

3:25 pm-3:45 pm

2 stops28h 20m

$830

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sat 11/1

12:41 pm-12:30 am

2 stops31h 49m

Porto Alegre Salgado Filho

Fri 11/7

1:35 am-10:30 pm

2 stops25h 55m

$1,343

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 10/3

10:00 am-3:05 pm

3 stops25h 05m

Porto Alegre Salgado Filho

Tue 10/7

1:55 pm-8:00 pm

3 stops34h 05m

$1,616

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 12/18

8:05 am-11:35 am

2 stops22h 30m

Porto Alegre Salgado Filho

Sat 1/3

8:10 pm-10:40 am

2 stops43h 30m

$2,214

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 12/18

5:05 pm-12:30 am

2 stops26h 25m

Porto Alegre Salgado Filho

Fri 1/2

1:45 am-11:57 pm

2 stops27h 12m

$2,956

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 12/18

7:10 am-2:35 pm

2 stops26h 25m

Porto Alegre Salgado Filho

Sat 1/3

4:55 pm-6:06 pm

3 stops30h 11m

$7,898

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

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 and Copa Airlines can get you from Seattle to Porto Alegre in just under 31h 49m. Your travel time can differ by up to 4h 32m. 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.

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