HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto Alegre

$421+ 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 11/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — POA
dic. 13 — dic. 201
sáb. 12/13
sáb. 12/20
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Porto Alegre with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 noviembre 13, 2025.

This Delta deal was found by Cheapflights users on 11/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/166:00 amSEA - POA
2 stops19h 30mDelta
mar. 12/26:40 amPOA - SEA
2 stops34h 59mDelta
Deal found 11/13$899
This Copa Airlines deal was found by Cheapflights users on 11/13. 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.
dom. 11/169:04 amSEA - POA
2 stops34h 26mCopa Airlines
lun. 12/11:35 amPOA - SEA
2 stops25h 55mCopa Airlines
Deal found 11/13$1,074
This Mytrip deal was found by Cheapflights users on 11/13. 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.
dom. 11/166:30 pmSEA - POA
3 stops36h 00mMultiple Airlines
mar. 12/23:25 pmPOA - SEA
3 stops28h 06mMultiple Airlines
Deal found 11/13$1,627
This Ovago deal was found by Cheapflights users on 11/11. 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.
vie. 12/197:25 amSEA - POA
2 stops28h 35mLATAM Airlines
dom. 1/44:40 amPOA - SEA
2 stops34h 27mLATAM Airlines
Deal found 11/11$2,171
This Ovago deal was found by Cheapflights users on 11/13. 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.
jue. 12/187:25 amSEA - POA
2 stops28h 35mLATAM Airlines
vie. 1/24:20 amPOA - SEA
2 stops35h 11mLATAM Airlines
Deal found 11/13$2,378
This Ovago deal was found by Cheapflights users on 11/11. 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.
sáb. 12/201:45 pmSEA - POA
2 stops35h 45mLATAM Airlines
vie. 1/24:20 amPOA - SEA
2 stops35h 11mLATAM Airlines
Deal found 11/11$2,520
This Ovago deal was found by Cheapflights users on 11/11. 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.
vie. 12/1912:43 pmSEA - POA
2 stops46h 47mGOL
lun. 1/59:20 pmPOA - SEA
2 stops44h 44mGOL
Deal found 11/11$2,584
This oojo deal was found by Cheapflights users on 11/11. 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.
jue. 12/189:00 amSEA - POA
2 stops21h 35mMultiple Airlines
sáb. 1/36:40 amPOA - SEA
2 stops33h 00mMultiple Airlines
Deal found 11/11$2,620

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 noviembre 13, 2025.

Most accurate provider

AranGrant
2 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,091
(LATAM Airlines)

One-way from

$421
(Kiwi.com)
Provider with most accurate pricing for Seattle/Tacoma Intl-Porto Alegre Salgado Filho flight deals.
Search Deals
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
Search Deals

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 noviembre 13, 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

mar. 3/24

6:00 am-5:00 pm

2 stops31h 00m

Porto Alegre Salgado Filho

jue. 3/26

5:55 pm-1:00 pm

2 stops23h 05m

$1,091

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

vie. 12/19

7:25 am-5:00 pm

2 stops28h 35m

Porto Alegre Salgado Filho

dom. 1/4

4:40 am-10:07 am

2 stops34h 27m

$2,171

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

jue. 12/18

7:25 am-5:00 pm

2 stops28h 35m

Porto Alegre Salgado Filho

vie. 1/2

4:20 am-10:31 am

2 stops35h 11m

$2,378

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

sáb. 12/20

1:45 pm-6:30 am

2 stops35h 45m

Porto Alegre Salgado Filho

vie. 1/2

4:20 am-10:31 am

2 stops35h 11m

$2,520

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

vie. 12/19

12:43 pm-4:30 pm

2 stops46h 47m

Porto Alegre Salgado Filho

lun. 1/5

9:20 pm-1:04 pm

2 stops44h 44m

$2,584

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

jue. 12/18

9:00 am-11:35 am

2 stops21h 35m

Porto Alegre Salgado Filho

sáb. 1/3

6:40 am-10:40 am

2 stops33h 00m

$2,620

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

mar. 11/25

12:46 pm-12:30 am

3 stops54h 44m

$421

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

vie. 11/28

9:53 pm-5:00 pm

3 stops38h 07m

$509

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

jue. 11/27

7:10 am-5:00 pm

2 stops28h 50m

$543

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

mié. 11/26

6:00 am-6:30 am

2 stops19h 30m

$543

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 15 results
1
2
  • Most accurate provider: When it comes to deals on Seattle-Porto Alegre flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Seattle-Porto Alegre flight deals on Cheapflights vs. AranGrant 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 AranGrant the most. AranGrant 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?

    LATAM Airlines can get you from Seattle to Porto Alegre in just under 31h. Your travel time can differ by up to . Seattle and Porto Alegre are separated by a distance of 6926 mi.

  • 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Porto Alegre

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Porto Alegre flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.