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Cheap flights from Boston to Porto Alegre from $399

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Porto Alegre departing on 8/11. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Travel Warning: Due to flooding, the airport may be currently closed. Check local travel advisories before booking.

Find the cheapest flights from Boston to Porto Alegre

Cheap round-trip flights

Enter your travel dates to find the best prices.
LATAM Airlines Logo
7:50 pm - 8:30 am
BOS
-
POA
34h 40m
2 stops
LATAM Airlines Logo
10:45 am - 6:45 am
POA
-
BOS
21h 00m
1 stop
$721LATAM Airlines
Tue, Nov 24 - Sat, Mar 20
LATAM Airlines Logo
10:15 am - 6:20 am
BOS
-
POA
19h 05m
2 stops
LATAM Airlines Logo
6:40 am - 11:23 pm
POA
-
BOS
17h 43m
2 stops
$724LATAM Airlines
Wed, Aug 19 - Mon, Oct 19
LATAM Airlines Logo
7:00 am - 4:50 pm
BOS
-
POA
31h 50m
2 stops
LATAM Airlines Logo
4:00 pm - 6:45 am
POA
-
BOS
15h 45m
1 stop
$769LATAM Airlines
Tue, Nov 24 - Sat, Mar 20
LATAM Airlines Logo
3:00 pm - 12:40 am
BOS
-
POA
32h 40m
2 stops
LATAM Airlines Logo
5:40 pm - 2:41 pm
POA
-
BOS
22h 01m
2 stops
$770LATAM Airlines
Wed, Oct 14 - Mon, Oct 26
LATAM Airlines Logo
5:00 pm - 4:50 pm
BOS
-
POA
21h 50m
2 stops
LATAM Airlines Logo
5:30 am - 11:23 pm
POA
-
BOS
18h 53m
2 stops
$779LATAM Airlines
Tue, Nov 24 - Sat, Mar 20
Avianca Logo
7:55 am - 10:40 am
BOS
-
POA
24h 45m
2 stops
Avianca Logo
2:00 pm - 6:35 am
POA
-
BOS
18h 35m
2 stops
$787Avianca
Tue, Nov 17 - Wed, Nov 18
LATAM Airlines Logo
3:50 pm - 4:50 pm
BOS
-
POA
23h 00m
2 stops
LATAM Airlines Logo
4:00 pm - 11:19 am
POA
-
BOS
20h 19m
2 stops
$790LATAM Airlines
Tue, Nov 24 - Sat, Mar 20
LATAM Airlines Logo
3:34 pm - 4:50 pm
BOS
-
POA
23h 16m
2 stops
LATAM Airlines Logo
12:25 pm - 6:45 am
POA
-
BOS
19h 20m
2 stops
$808LATAM Airlines
Tue, Nov 24 - Sat, Mar 20
Avianca Logo
7:55 am - 10:40 am
BOS
-
POA
24h 45m
2 stops
Avianca Logo
2:00 pm - 6:35 am
POA
-
BOS
18h 35m
2 stops
$817Avianca
Tue, Nov 17 - Wed, Nov 18
LATAM Airlines Logo
8:55 am - 8:30 am
BOS
-
POA
21h 35m
1 stop
LATAM Airlines Logo
5:40 pm - 2:41 pm
POA
-
BOS
23h 01m
2 stops
$820LATAM Airlines
Tue, Nov 17 - Wed, Nov 18

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LATAM Airlines flights from Boston to Porto Alegre

Our best LATAM Airlines deals on Boston to Porto Alegre flight tickets
LATAM Airlines
Nov 24
BOS7:50 pmBoston Logan Intl
34h 40m
2 stops
POA8:30 amPorto Alegre Salgado Filho
Mar 20
POA10:45 amPorto Alegre Salgado Filho
21h 00m
1 stop
BOS6:45 amBoston Logan Intl
$721
LATAM Airlines
Aug 19
BOS10:15 amBoston Logan Intl
19h 05m
2 stops
POA6:20 amPorto Alegre Salgado Filho
Oct 19
POA6:40 amPorto Alegre Salgado Filho
17h 43m
2 stops
BOS11:23 pmBoston Logan Intl
$724
LATAM Airlines
Nov 24
BOS7:00 amBoston Logan Intl
31h 50m
2 stops
POA4:50 pmPorto Alegre Salgado Filho
Mar 20
POA4:00 pmPorto Alegre Salgado Filho
15h 45m
1 stop
BOS6:45 amBoston Logan Intl
$769

Avianca flights from Boston to Porto Alegre

Our best Avianca deals on Boston to Porto Alegre flight tickets
Avianca
Nov 17
BOS7:55 amBoston Logan Intl
24h 45m
2 stops
POA10:40 amPorto Alegre Salgado Filho
Nov 18
POA2:00 pmPorto Alegre Salgado Filho
18h 35m
2 stops
BOS6:35 amBoston Logan Intl
$787
Avianca
Nov 17
BOS7:55 amBoston Logan Intl
24h 45m
2 stops
POA10:40 amPorto Alegre Salgado Filho
Nov 18
POA2:00 pmPorto Alegre Salgado Filho
18h 35m
2 stops
BOS6:35 amBoston Logan Intl
$817

momondo Fare Finder

 
Customize your flight search to find flights from Boston 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 June 26, 2026.
Use the filters below to find and compare flights from Boston to Porto Alegre that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/24

7:50 pm-8:30 am

2 stops34h 40m

Porto Alegre Salgado Filho

Sat 3/20

10:45 am-6:45 am

1 stop21h 00m

$721
Quickest round-trip

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Wed 8/19

10:15 am-6:20 am

2 stops19h 05m

Porto Alegre Salgado Filho

Mon 10/19

6:40 am-11:23 pm

2 stops17h 43m

$724

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/24

7:00 am-4:50 pm

2 stops31h 50m

Porto Alegre Salgado Filho

Sat 3/20

4:00 pm-6:45 am

1 stop15h 45m

$769

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Wed 10/14

3:00 pm-12:40 am

2 stops32h 40m

Porto Alegre Salgado Filho

Mon 10/26

5:40 pm-2:41 pm

2 stops22h 01m

$770

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/24

5:00 pm-4:50 pm

2 stops21h 50m

Porto Alegre Salgado Filho

Sat 3/20

5:30 am-11:23 pm

2 stops18h 53m

$779

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/17

7:55 am-10:40 am

2 stops24h 45m

Porto Alegre Salgado Filho

Wed 11/18

2:00 pm-6:35 am

2 stops18h 35m

$787

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/24

3:50 pm-4:50 pm

2 stops23h 00m

Porto Alegre Salgado Filho

Sat 3/20

4:00 pm-11:19 am

2 stops20h 19m

$790

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/24

3:34 pm-4:50 pm

2 stops23h 16m

Porto Alegre Salgado Filho

Sat 3/20

12:25 pm-6:45 am

2 stops19h 20m

$808

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/17

7:55 am-10:40 am

2 stops24h 45m

Porto Alegre Salgado Filho

Wed 11/18

2:00 pm-6:35 am

2 stops18h 35m

$817

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 11/17

8:55 am-8:30 am

1 stop21h 35m

Porto Alegre Salgado Filho

Wed 11/18

5:40 pm-2:41 pm

2 stops23h 01m

$820

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Porto Alegre from

How to get the cheapest flight ticket from Boston 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 typical price of a round-trip flight between Boston and Porto Alegre?

What is the cheapest month to fly to Porto Alegre?

The cheapest month to fly to Porto Alegre from Boston is in March. Flight prices, which tend to average around $712, are often lower during this time because this is during the off-season. If you’re not able to fly to Porto Alegre in March, then October is your next best option. Flight prices from Boston to Porto Alegre during October average around $736.

Can stopping save me money on Boston to Porto Alegre flights?

You could potentially save up to 7% on your flight if you consider stops on a Boston to Porto Alegre flight.

How have Boston to Porto Alegre flight prices changed over time?

When to book flights from Boston to Porto Alegre

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Porto Alegre according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Boston to Porto Alegre (BOS to POA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Porto Alegre

Fastest flight time

17h 45m

Direct flights

None
The fastest flight from Boston to Porto Alegre takes 17h 45m
There are no direct flights from Boston to Porto Alegre. There are no popular flight routes from Boston to Porto Alegre.
Search flight deals

Frequently asked questions about flying from Boston to Porto Alegre

  • How far is Boston Logan Intl to Porto Alegre Salgado Filho by plane?

    There are 5155.0 mi between Boston Logan Intl and Porto Alegre Salgado Filho. Flights usually cover this in 17h 45m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Porto Alegre Salgado Filho Airport?

    Prices for flights from Boston Logan Intl Airport to Porto Alegre Salgado Filho Airport were last updated today.

  • How many operators does momondo search for flights from Boston Logan Intl Airport to Porto Alegre Salgado Filho Airport?

  • How old do you have to be to fly from Boston Logan Intl Airport to Porto Alegre Salgado Filho Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Boston Logan 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 required for your trip to Porto Alegre Salgado Filho Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Alegre Salgado Filho Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Boston to Porto Alegre?

Best airlines flying from Boston to Porto Alegre

Compare and see reviews for airlines that fly from Boston to Porto Alegre with momondo
Airline
Rating
Free Cancellation
Price
Copa AirlinesPriceFrom $294Free CancellationRating
7.6
1,569 reviews
Search Copa Airlines flights
United AirlinesPriceFrom $334Free CancellationRating
7.4
9,897 reviews
Search United Airlines flights
LATAM AirlinesPriceFrom $722Free CancellationRating
7.4
1,941 reviews
Search LATAM Airlines flights
DeltaPriceFrom $765Free CancellationRating
7.8
8,452 reviews
Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Porto Alegre?

It is quick and easy to find Boston to Porto Alegre flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Porto Alegre that suits you.

Can I find flights from Boston to Porto Alegre with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Boston to Porto Alegre flights to just show those with flexible booking policies.

How can momondo help me find flights from Boston to Porto Alegre?

Once all potential Boston to Porto Alegre flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Boston to Porto Alegre right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Porto Alegre, momondo offers a useful price alert feature which will track prices for flights to Porto Alegre from Boston and alert you when they change.

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