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Cheap flights from Boston to Porto Alegre from $330

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 12/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Boston to Porto Alegre

Cheap round-trip flights

Copa Airlines Logo
8:41 am - 12:20 amBOS-POA
14h 39m1 stop
Copa Airlines Logo
1:25 am - 10:53 pmPOA-BOS
22h 28m1 stop
$530Copa Airlines
Find Deal
Tue, Sep 23 - Wed, Oct 15
Copa Airlines Logo
8:41 am - 12:20 amBOS-POA
14h 39m1 stop
Copa Airlines Logo
1:25 am - 10:53 pmPOA-BOS
22h 28m1 stop
$550Copa Airlines
Find Deal
Sun, Oct 5 - Wed, Oct 15
United Airlines Logo
7:12 pm - 2:35 pmBOS-POA
18h 23m2 stops
United Airlines Logo
2:05 pm - 9:56 amPOA-BOS
44h 51m2 stops
$554United Airlines
Find Deal
Tue, Sep 23 - Thu, Oct 16
Copa Airlines Logo
8:41 am - 12:20 amBOS-POA
14h 39m1 stop
Copa Airlines Logo
1:35 am - 10:03 pmPOA-BOS
22h 28m1 stop
$604Copa Airlines
Find Deal
Wed, Oct 22 - Tue, Nov 4
United Airlines Logo
9:53 am - 6:20 pmBOS-POA
31h 27m2 stops
United Airlines Logo
5:10 pm - 9:14 amPOA-BOS
18h 04m2 stops
$622United Airlines
Find Deal
Wed, Oct 22 - Wed, Nov 5
Logo
6:10 am - 12:20 amBOS-POA
41h 10m2 stops
Logo
1:25 am - 10:53 pmPOA-BOS
22h 28m1 stop
$681
Find Deal
Tue, Sep 23 - Wed, Oct 15
Logo
9:00 am - 5:50 pmBOS-POA
31h 50m2 stops
Logo
11:40 am - 6:35 amPOA-BOS
44h 55m2 stops
$713
Find Deal
Tue, Oct 21 - Thu, Nov 6
GOL Logo
9:00 am - 10:25 amBOS-POA
24h 25m2 stops
GOL Logo
5:20 am - 11:30 pmPOA-BOS
19h 10m2 stops
$766GOL
Find Deal
Sat, Oct 4 - Sat, Oct 18
GOL Logo
9:00 am - 10:25 amBOS-POA
24h 25m2 stops
GOL Logo
5:20 am - 11:30 pmPOA-BOS
19h 10m2 stops
$767GOL
Find Deal
Sat, Oct 4 - Sat, Oct 18
Air Canada Logo
10:20 am - 2:35 pmBOS-POA
27h 15m2 stops
Air Canada Logo
11:15 am - 9:32 amPOA-BOS
24h 17m2 stops
$828Air Canada
Find Deal
Wed, Oct 22 - Sun, Nov 2

Copa Airlines flights from Boston to Porto Alegre

Our best Copa Airlines deals on Boston to Porto Alegre flight tickets
Copa Airlines
Sep 23
BOS8:41 amBoston Logan Intl
14h 39m
1 stop
POA12:20 amPorto Alegre Salgado Filho
Oct 15
POA1:25 amPorto Alegre Salgado Filho
22h 28m
1 stop
BOS10:53 pmBoston Logan Intl
$530
Find similar
Copa Airlines
Oct 5
BOS8:41 amBoston Logan Intl
14h 39m
1 stop
POA12:20 amPorto Alegre Salgado Filho
Oct 15
POA1:25 amPorto Alegre Salgado Filho
22h 28m
1 stop
BOS10:53 pmBoston Logan Intl
$550
Find similar
Copa Airlines
Oct 22
BOS8:41 amBoston Logan Intl
14h 39m
1 stop
POA12:20 amPorto Alegre Salgado Filho
Nov 4
POA1:35 amPorto Alegre Salgado Filho
22h 28m
1 stop
BOS10:03 pmBoston Logan Intl
$604
Find similar

United Airlines flights from Boston to Porto Alegre

Our best United Airlines deals on Boston to Porto Alegre flight tickets
United Airlines
Sep 22
BOS6:16 pmBoston Logan Intl
20h 54m
2 stops
POA4:10 pmPorto Alegre Salgado Filho
Oct 6
POA5:10 pmPorto Alegre Salgado Filho
26h 46m
2 stops
BOS6:56 pmBoston Logan Intl
$547
Find similar
United Airlines
Sep 23
BOS7:12 pmBoston Logan Intl
18h 23m
2 stops
POA2:35 pmPorto Alegre Salgado Filho
Oct 16
POA2:05 pmPorto Alegre Salgado Filho
44h 51m
2 stops
BOS9:56 amBoston Logan Intl
$554
Find similar
United Airlines
Oct 22
BOS9:53 amBoston Logan Intl
31h 27m
2 stops
POA6:20 pmPorto Alegre Salgado Filho
Nov 5
POA5:10 pmPorto Alegre Salgado Filho
18h 04m
2 stops
BOS9:14 amBoston Logan Intl
$622
Find similar

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 September 15, 2025.
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

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 9/23

8:41 am-12:20 am

1 stop14h 39m

Porto Alegre Salgado Filho

Wed 10/15

1:25 am-10:53 pm

1 stop22h 28m

$530

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Sun 10/5

8:41 am-12:20 am

1 stop14h 39m

Porto Alegre Salgado Filho

Wed 10/15

1:25 am-10:53 pm

1 stop22h 28m

$550

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 9/23

7:12 pm-2:35 pm

2 stops18h 23m

Porto Alegre Salgado Filho

Thu 10/16

2:05 pm-9:56 am

2 stops44h 51m

$554

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Wed 10/22

8:41 am-12:20 am

1 stop14h 39m

Porto Alegre Salgado Filho

Tue 11/4

1:35 am-10:03 pm

1 stop22h 28m

$604

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Wed 10/22

9:53 am-6:20 pm

2 stops31h 27m

Porto Alegre Salgado Filho

Wed 11/5

5:10 pm-9:14 am

2 stops18h 04m

$622

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 9/23

6:10 am-12:20 am

2 stops41h 10m

Porto Alegre Salgado Filho

Wed 10/15

1:25 am-10:53 pm

1 stop22h 28m

$681

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Tue 10/21

9:00 am-5:50 pm

2 stops31h 50m

Porto Alegre Salgado Filho

Thu 11/6

11:40 am-6:35 am

2 stops44h 55m

$713

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Sat 10/4

9:00 am-10:25 am

2 stops24h 25m

Porto Alegre Salgado Filho

Sat 10/18

5:20 am-11:30 pm

2 stops19h 10m

$766

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Sat 10/4

9:00 am-10:25 am

2 stops24h 25m

Porto Alegre Salgado Filho

Sat 10/18

5:20 am-11:30 pm

2 stops19h 10m

$767

BostonPorto Alegre

BOS - POA

BOSPOA

Boston Logan Intl

Wed 10/22

10:20 am-2:35 pm

2 stops27h 15m

Porto Alegre Salgado Filho

Sun 11/2

11:15 am-9:32 am

2 stops24h 17m

$828

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 cheapest month to fly to Porto Alegre?

The cheapest month to fly to Porto Alegre from Boston is in June. Flight prices, which tend to average around $486, are often lower during this time because this is during the off-season. If you’re not able to fly to Porto Alegre in June, then May is your next best option. Flight prices from Boston to Porto Alegre during May average around $569.

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

Our data shows that Tuesday is the least expensive day to fly to Porto Alegre. Tickets to fly out on this day can be as low as $714. On the other hand, Friday is the most expensive day to depart from Boston because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,701.

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 Boston to Porto Alegre during this time can be as low as $865. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,064 on average. Flights to Porto Alegre from Boston at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Porto Alegre?

You are more likely to see cheaper flights to Porto Alegre from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto Alegre for around $728 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto Alegre from Boston for as low as $550 on momondo.

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

You could potentially save up to 41% 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?

As of September 2025, prices for Boston to Porto Alegre flights are approximately 14% cheaper when compared to flights at the same time last year.

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

Direct flights

None
There are no direct flights from Boston to Porto Alegre. There are no popular flight routes from Boston to Porto Alegre.
Search flight deals

  • 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 12h 20m, 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
DeltaPriceFrom $291Free CancellationRating
7.9
7,954 reviews
Search Delta flights
Copa AirlinesPriceFrom $450Free CancellationRating
7.6
1,531 reviews
Search Copa Airlines flights
LATAM AirlinesPriceFrom $501Free CancellationRating
7.5
1,847 reviews
Search LATAM Airlines flights
American AirlinesPriceFrom $510Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
GOLPriceFrom $712Free CancellationRating
7.3
1,105 reviews
Search GOL 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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