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Porto Alegre

$385+ 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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — POA
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
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 August 18, 2025.

Round-trip from

$507
(United Airlines)

One-way from

$385
(Kiwi.com)
From Seattle/Tacoma Intl to Porto Alegre Salgado Filho
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One-way flight 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 August 18, 2025.

This United Airlines deal was found by Cheapflights users on 8/17. 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.
Tue 9/92:00 pmSEA - POA
2 stops20h 35mUnited Airlines
Tue 9/231:55 pmPOA - SEA
2 stops35h 23mUnited Airlines
Deal found 8/17$507
This Copa Airlines deal was found by Cheapflights users on 8/17. 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.
Tue 9/95:14 pmSEA - POA
2 stops27h 06mCopa Airlines
Mon 9/221:25 amPOA - SEA
2 stops24h 50mCopa Airlines
Deal found 8/17$890
This Cheapflightsfares deal was found by Cheapflights users on 8/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/128:00 amSEA - POA
2 stops28h 00mLATAM Airlines
Mon 1/126:55 amPOA - SEA
2 stops32h 34mLATAM Airlines
Deal found 8/16$1,212
This Copa Airlines deal was found by Cheapflights users on 8/16. 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.
Fri 12/1212:36 pmSEA - POA
2 stops30h 54mCopa Airlines
Sun 1/111:45 amPOA - SEA
2 stops25h 33mCopa Airlines
Deal found 8/16$1,700
This Booking.com deal was found by Cheapflights users on 8/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/125:50 amSEA - POA
3 stops28h 15mAir Canada
Mon 1/125:55 pmPOA - SEA
3 stops25h 31mAir Canada
Deal found 8/16$1,861
This Booking.com deal was found by Cheapflights users on 8/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/128:15 amSEA - POA
2 stops26h 25mMultiple Airlines
Mon 1/123:25 pmPOA - SEA
3 stops32h 51mMultiple Airlines
Deal found 8/16$1,867
This Ovago deal was found by Cheapflights users on 8/18. 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 12/1811:54 amSEA - POA
2 stops23h 36mGOL
Sat 1/35:55 pmPOA - SEA
2 stops23h 32mGOL
Deal found 8/18$2,253
This American Airlines deal was found by Cheapflights users on 8/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/97:48 amSEA - POA
3 stops22h 37mAmerican Airlines
Tue 9/231:55 pmPOA - SEA
2 stops26h 17mAmerican Airlines
Deal found 8/17$2,343
This Copa Airlines deal was found by Cheapflights users on 8/18. 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 8/18$2,637

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 August 18, 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

Tue 9/9

2:00 pm-2:35 pm

2 stops20h 35m

Porto Alegre Salgado Filho

Tue 9/23

1:55 pm-9:18 pm

2 stops35h 23m

$507

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 9/9

5:14 pm-12:20 am

2 stops27h 06m

Porto Alegre Salgado Filho

Mon 9/22

1:25 am-10:15 pm

2 stops24h 50m

$890

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 12/12

8:00 am-5:00 pm

2 stops28h 00m

Porto Alegre Salgado Filho

Mon 1/12

6:55 am-10:29 am

2 stops32h 34m

$1,212

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 12/12

12:36 pm-12:30 am

2 stops30h 54m

Porto Alegre Salgado Filho

Sun 1/11

1:45 am-10:18 pm

2 stops25h 33m

$1,700

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 12/12

5:50 am-3:05 pm

3 stops28h 15m

Porto Alegre Salgado Filho

Mon 1/12

5:55 pm-2:26 pm

3 stops25h 31m

$1,861

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 12/12

8:15 am-3:40 pm

2 stops26h 25m

Porto Alegre Salgado Filho

Mon 1/12

3:25 pm-7:16 pm

3 stops32h 51m

$1,867

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sat 10/18

1:02 pm-4:10 pm

3 stops47h 08m

$385

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Thu 10/16

4:26 pm-9:10 am

3 stops36h 44m

$404

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 10/15

1:02 pm-8:45 am

3 stops39h 43m

$415

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 10/15

5:31 pm-12:20 am

2 stops26h 49m

$429

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 17 results
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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.

  • 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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Alternative routes for Seattle to Porto Alegre

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