Cheap flights from St. Louis to Porto Alegre from $1,136

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Porto Alegre departing on 8/25. 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
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Find the cheapest flights from St. Louis to Porto Alegre

Cheap round-trip flights

GOL Logo
5:26 am - 11:30 amSTL-POA
28h 04m2 stops
GOL Logo
4:55 pm - 11:59 pmPOA-STL
33h 04m2 stops
$1,136GOL
Find Deal
Mon, Aug 25 - Mon, Sep 1
GOL Logo
3:59 pm - 4:15 pmSTL-POA
22h 16m2 stops
GOL Logo
5:10 am - 11:56 pmPOA-STL
20h 46m2 stops
$1,174GOL
Find Deal
Fri, Sep 5 - Fri, Oct 31
 Logo
1:30 pm - 3:05 pmSTL-POA
23h 35m2 stops
 Logo
1:55 pm - 5:55 pmPOA-STL
30h 00m3 stops
$1,631
Find Deal
Fri, Sep 5 - Fri, Oct 31
 Logo
9:15 am - 2:35 pmSTL-POA
27h 20m2 stops
 Logo
8:30 am - 7:38 pmPOA-STL
37h 08m3 stops
$2,072
Find Deal
Mon, Aug 25 - Mon, Sep 1
 Logo
9:15 am - 9:45 pmSTL-POA
34h 30m3 stops
 Logo
10:05 am - 7:57 pmPOA-STL
35h 52m3 stops
$2,991
Find Deal
Mon, Aug 25 - Mon, Sep 1
American Airlines Logo
9:57 am - 10:25 amSTL-POA
22h 28m3 stops
American Airlines Logo
5:55 pm - 3:45 pmPOA-STL
23h 50m3 stops
$3,623American Airlines
Find Deal
Fri, Sep 5 - Fri, Oct 31

GOL flights from St. Louis to Porto Alegre

Our best GOL deals on St. Louis to Porto Alegre flight tickets
GOL
Aug 25
STL5:26 amLambert-St Louis
28h 04m
2 stops
POA11:30 amPorto Alegre Salgado Filho
Sep 1
POA4:55 pmPorto Alegre Salgado Filho
33h 04m
2 stops
STL11:59 pmLambert-St Louis
GOL
Sep 5
STL3:59 pmLambert-St Louis
22h 16m
2 stops
POA4:15 pmPorto Alegre Salgado Filho
Oct 31
POA5:10 amPorto Alegre Salgado Filho
20h 46m
2 stops
STL11:56 pmLambert-St Louis

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis 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 July 29, 2025.
Use the filters below to find and compare flights from St. Louis to Porto Alegre that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 8/25

5:26 am-11:30 am

2 stops28h 04m

Porto Alegre Salgado Filho

Mon 9/1

4:55 pm-11:59 pm

2 stops33h 04m

$1,136

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Fri 9/5

3:59 pm-4:15 pm

2 stops22h 16m

Porto Alegre Salgado Filho

Fri 10/31

5:10 am-11:56 pm

2 stops20h 46m

$1,174

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Fri 9/5

1:30 pm-3:05 pm

2 stops23h 35m

Porto Alegre Salgado Filho

Fri 10/31

1:55 pm-5:55 pm

3 stops30h 00m

$1,631

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 8/25

9:15 am-2:35 pm

2 stops27h 20m

Porto Alegre Salgado Filho

Mon 9/1

8:30 am-7:38 pm

3 stops37h 08m

$2,072

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 8/25

9:15 am-9:45 pm

3 stops34h 30m

Porto Alegre Salgado Filho

Mon 9/1

10:05 am-7:57 pm

3 stops35h 52m

$2,991

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Fri 9/5

9:57 am-10:25 am

3 stops22h 28m

Porto Alegre Salgado Filho

Fri 10/31

5:55 pm-3:45 pm

3 stops23h 50m

$3,623

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 St. Louis 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 $1,120. On the other hand, Wednesday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,299.

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 afternoon. Flights from St. Louis to Porto Alegre during this time can be as low as $1,130. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,299 on average. Flights to Porto Alegre from St. Louis in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from St. Louis to Porto Alegre

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

Cheap St. Louis to Porto Alegre (STL to POA) flight deals and tips

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

Best Price Found

$1,136

Fastest flight time

22h 16m

Direct flights

None

Airports in Porto Alegre

1 airport
The best flight deal from St. Louis to Porto Alegre found on momondo in the last 72 hours is $1,136
The fastest flight from St. Louis to Porto Alegre takes 22h 16m
There are no direct flights from St. Louis to Porto Alegre. Popular non-direct route for this connection is Lambert-St Louis Airport - Porto Alegre Salgado Filho Airport.
There is 1 airport near Porto Alegre: Porto Alegre Salgado Filho (POA)

  • How far is Lambert-St Louis to Porto Alegre Salgado Filho by plane?

    A flight from Lambert-St Louis to Porto Alegre Salgado Filho will travel around 5363.5 mi. Typically, this will take 22h 16m by plane in normal conditions.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Porto Alegre Salgado Filho Airport?

    Prices for flights from Lambert-St Louis Airport to Porto Alegre Salgado Filho Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Lambert-St Louis 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 Lambert-St Louis 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 St. Louis to Porto Alegre?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Porto Alegre. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Porto Alegre with flexible booking policies on momondo?

Yes. All flights to Porto Alegre from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from St. Louis to Porto Alegre?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Porto Alegre from St. Louis.

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

If you are not ready to book a flight from St. Louis to Porto Alegre now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Porto Alegre and let you know when they change.


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1 adult
Sun 8/3
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