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Cheap flights from Seattle to Porto Alegre from $718

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 3/17. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
7:00 am - 2:35 pmSEA-POA
27h 35m2 stops
United Airlines Logo
3:25 pm - 6:58 pmPOA-SEA
31h 33m2 stops
$718United Airlines
Find Deal
Tue, Mar 17 - Fri, Mar 20
United Airlines Logo
11:59 pm - 4:10 pmSEA-POA
35h 11m2 stops
United Airlines Logo
5:10 pm - 8:35 pmPOA-SEA
31h 25m2 stops
$813United Airlines
Find Deal
Sun, Mar 1 - Mon, Mar 16
American Airlines Logo
10:30 am - 5:45 pmSEA-POA
26h 15m2 stops
American Airlines Logo
5:55 pm - 9:10 pmPOA-SEA
31h 15m2 stops
$838American Airlines
Find Deal
Wed, Feb 25 - Tue, Mar 10
United Airlines Logo
8:30 am - 2:35 pmSEA-POA
26h 05m3 stops
United Airlines Logo
3:25 pm - 6:58 pmPOA-SEA
31h 33m2 stops
$958United Airlines
Find Deal
Tue, Mar 17 - Fri, Mar 20
Air Canada Logo
8:10 am - 2:20 pmSEA-POA
25h 10m2 stops
Air Canada Logo
5:10 pm - 3:01 pmPOA-SEA
25h 51m3 stops
$1,020Air Canada
Find Deal
Sun, Mar 1 - Mon, Mar 16
LATAM Airlines Logo
11:50 am - 5:00 pmSEA-POA
25h 10m2 stops
LATAM Airlines Logo
8:10 pm - 2:24 pmPOA-SEA
22h 14m2 stops
$1,091LATAM Airlines
Find Deal
Tue, Mar 24 - Thu, Mar 26
Air Canada Logo
10:05 am - 2:20 pmSEA-POA
23h 15m3 stops
Air Canada Logo
5:10 pm - 3:01 pmPOA-SEA
25h 51m3 stops
$1,180Air Canada
Find Deal
Sun, Mar 1 - Mon, Mar 16
LATAM Airlines Logo
7:10 am - 9:20 amSEA-POA
21h 10m2 stops
LATAM Airlines Logo
6:00 pm - 12:39 pmPOA-SEA
23h 39m2 stops
$1,248LATAM Airlines
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Fri, Nov 21 - Fri, Nov 28
Copa Airlines Logo
8:45 am - 12:25 amSEA-POA
34h 40m2 stops
Copa Airlines Logo
1:30 am - 11:16 pmPOA-SEA
25h 46m2 stops
$1,474Copa Airlines
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Sun, Mar 1 - Sun, Mar 15
Copa Airlines Logo
5:20 pm - 12:25 amSEA-POA
26h 05m2 stops
Copa Airlines Logo
1:30 am - 11:16 pmPOA-SEA
25h 46m2 stops
$1,598Copa Airlines
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Wed, Feb 25 - Mon, Mar 9

United Airlines flights from Seattle to Porto Alegre

Our best United Airlines deals on Seattle to Porto Alegre flight tickets
United Airlines
Mar 17
SEA7:00 amSeattle/Tacoma Intl
27h 35m
2 stops
POA2:35 pmPorto Alegre Salgado Filho
Mar 20
POA3:25 pmPorto Alegre Salgado Filho
31h 33m
2 stops
SEA6:58 pmSeattle/Tacoma Intl
$718
Find similar
United Airlines
Mar 1
SEA11:59 pmSeattle/Tacoma Intl
35h 11m
2 stops
POA4:10 pmPorto Alegre Salgado Filho
Mar 16
POA5:10 pmPorto Alegre Salgado Filho
31h 25m
2 stops
SEA8:35 pmSeattle/Tacoma Intl
$813
Find similar
United Airlines
Mar 17
SEA8:30 amSeattle/Tacoma Intl
26h 05m
3 stops
POA2:35 pmPorto Alegre Salgado Filho
Mar 20
POA3:25 pmPorto Alegre Salgado Filho
31h 33m
2 stops
SEA6:58 pmSeattle/Tacoma Intl
$958
Find similar

Air Canada flights from Seattle to Porto Alegre

Our best Air Canada deals on Seattle to Porto Alegre flight tickets
Air Canada
Mar 1
SEA8:10 amSeattle/Tacoma Intl
25h 10m
2 stops
POA2:20 pmPorto Alegre Salgado Filho
Mar 16
POA5:10 pmPorto Alegre Salgado Filho
25h 51m
3 stops
SEA3:01 pmSeattle/Tacoma Intl
$1,020
Find similar
Air Canada
Mar 1
SEA10:05 amSeattle/Tacoma Intl
23h 15m
3 stops
POA2:20 pmPorto Alegre Salgado Filho
Mar 16
POA5:10 pmPorto Alegre Salgado Filho
25h 51m
3 stops
SEA3:01 pmSeattle/Tacoma Intl
$1,180
Find similar
Air Canada
Dec 20
SEA8:00 pmSeattle/Tacoma Intl
39h 30m
3 stops
POA4:30 pmPorto Alegre Salgado Filho
Jan 2
POA6:05 pmPorto Alegre Salgado Filho
25h 26m
3 stops
SEA2:31 pmSeattle/Tacoma Intl
$5,383
Find similar

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 November 4, 2025.
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

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 3/17

7:00 am-2:35 pm

2 stops27h 35m

Porto Alegre Salgado Filho

Fri 3/20

3:25 pm-6:58 pm

2 stops31h 33m

$718

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 3/1

11:59 pm-4:10 pm

2 stops35h 11m

Porto Alegre Salgado Filho

Mon 3/16

5:10 pm-8:35 pm

2 stops31h 25m

$813

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 2/25

10:30 am-5:45 pm

2 stops26h 15m

Porto Alegre Salgado Filho

Tue 3/10

5:55 pm-9:10 pm

2 stops31h 15m

$838

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 3/17

8:30 am-2:35 pm

3 stops26h 05m

Porto Alegre Salgado Filho

Fri 3/20

3:25 pm-6:58 pm

2 stops31h 33m

$958

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 3/1

8:10 am-2:20 pm

2 stops25h 10m

Porto Alegre Salgado Filho

Mon 3/16

5:10 pm-3:01 pm

3 stops25h 51m

$1,020

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Tue 3/24

11:50 am-5:00 pm

2 stops25h 10m

Porto Alegre Salgado Filho

Thu 3/26

8:10 pm-2:24 pm

2 stops22h 14m

$1,091

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 3/1

10:05 am-2:20 pm

3 stops23h 15m

Porto Alegre Salgado Filho

Mon 3/16

5:10 pm-3:01 pm

3 stops25h 51m

$1,180

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Fri 11/21

7:10 am-9:20 am

2 stops21h 10m

Porto Alegre Salgado Filho

Fri 11/28

6:00 pm-12:39 pm

2 stops23h 39m

$1,248

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Sun 3/1

8:45 am-12:25 am

2 stops34h 40m

Porto Alegre Salgado Filho

Sun 3/15

1:30 am-11:16 pm

2 stops25h 46m

$1,474

SeattlePorto Alegre

SEA - POA

SEAPOA

Seattle/Tacoma Intl

Wed 2/25

5:20 pm-12:25 am

2 stops26h 05m

Porto Alegre Salgado Filho

Mon 3/9

1:30 am-11:16 pm

2 stops25h 46m

$1,598

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Porto Alegre from

How to get the cheapest flight ticket from Seattle to Porto Alegre

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Porto Alegre?

Our data shows that Thursday is the least expensive day to fly to Porto Alegre. Tickets to fly out on this day can be as low as $858. On the other hand, Saturday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,654.

What is the cheapest time of day to depart on your flight to Porto Alegre?

Our most recent data shows that the best time of day to fly to Porto Alegre is in the evening. Flights from Seattle to Porto Alegre during this time can be as low as $869. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,038 on average. Flights to Porto Alegre from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

Direct flights

None
There are no direct flights from Seattle to Porto Alegre. There are no popular flight routes from Seattle to Porto Alegre.
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  • 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 20h 39m.

  • 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.

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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