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Cheap flights from St. Louis to Porto Alegre from $687

This is the cheapest one-way 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 7/31. 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
Travel Warning: Due to flooding, the airport may be currently closed. Check local travel advisories before booking.

Find the cheapest flights from St. Louis to Porto Alegre

Cheap round-trip flights

Enter your travel dates to find the best prices.
GOL Logo
5:00 am - 11:35 pm
STL
-
POA
16h 35m
2 stops
GOL Logo
4:40 am - 10:40 pm
POA
-
STL
20h 00m
2 stops
$1,149GOL
Sun, Aug 9 - Tue, Aug 18
GOL Logo
5:00 am - 11:35 pm
STL
-
POA
16h 35m
2 stops
GOL Logo
4:40 am - 10:40 pm
POA
-
STL
20h 00m
2 stops
$1,223GOL
Sun, Aug 9 - Mon, Aug 17
GOL Logo
5:00 am - 11:35 pm
STL
-
POA
16h 35m
2 stops
GOL Logo
4:40 am - 10:40 pm
POA
-
STL
20h 00m
2 stops
$1,229GOL
Sat, Aug 8 - Tue, Aug 18
Delta Logo
9:15 am - 6:20 am
STL
-
POA
43h 05m
2 stops
Delta Logo
6:40 am - 5:53 pm
POA
-
STL
37h 13m
2 stops
$1,304Delta
Tue, Aug 11 - Wed, Aug 19
Delta Logo
12:30 pm - 2:10 pm
STL
-
POA
23h 40m
2 stops
Delta Logo
7:35 am - 6:27 pm
POA
-
STL
36h 52m
2 stops
$1,308Delta
Mon, Aug 10 - Mon, Aug 17
Delta Logo
12:30 pm - 2:10 pm
STL
-
POA
23h 40m
2 stops
Delta Logo
6:40 am - 3:38 pm
POA
-
STL
34h 58m
2 stops
$1,311Delta
Mon, Aug 10 - Wed, Aug 19
GOL Logo
5:00 am - 11:35 pm
STL
-
POA
16h 35m
2 stops
GOL Logo
4:40 am - 10:39 am
POA
-
STL
31h 59m
2 stops
$1,314GOL
Sun, Aug 9 - Tue, Aug 18
LATAM Airlines Logo
4:13 pm - 11:25 pm
STL
-
POA
28h 12m
2 stops
LATAM Airlines Logo
11:00 am - 5:06 pm
POA
-
STL
33h 06m
2 stops
$1,319LATAM Airlines
Tue, Dec 1 - Thu, Dec 3
Delta Logo
5:25 pm - 2:10 pm
STL
-
POA
42h 45m
2 stops
Delta Logo
6:40 am - 3:38 pm
POA
-
STL
34h 58m
2 stops
$1,323Delta
Sun, Aug 9 - Wed, Aug 19
Delta Logo
5:23 pm - 6:20 am
STL
-
POA
34h 57m
2 stops
Delta Logo
6:40 am - 11:38 am
POA
-
STL
30h 58m
2 stops
$1,344Delta
Tue, Aug 11 - Fri, Aug 21

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Delta flights from St. Louis to Porto Alegre

Our best Delta deals on St. Louis to Porto Alegre flight tickets
Delta
Aug 11
STL9:15 amLambert-St Louis
43h 05m
2 stops
POA6:20 amPorto Alegre Salgado Filho
Aug 19
POA6:40 amPorto Alegre Salgado Filho
37h 13m
2 stops
STL5:53 pmLambert-St Louis
$1,304
Delta
Aug 10
STL12:30 pmLambert-St Louis
23h 40m
2 stops
POA2:10 pmPorto Alegre Salgado Filho
Aug 17
POA7:35 amPorto Alegre Salgado Filho
36h 52m
2 stops
STL6:27 pmLambert-St Louis
$1,308
Delta
Aug 10
STL12:30 pmLambert-St Louis
23h 40m
2 stops
POA2:10 pmPorto Alegre Salgado Filho
Aug 19
POA6:40 amPorto Alegre Salgado Filho
34h 58m
2 stops
STL3:38 pmLambert-St Louis
$1,311

GOL flights from St. Louis to Porto Alegre

Our best GOL deals on St. Louis to Porto Alegre flight tickets
GOL
Aug 9
STL5:00 amLambert-St Louis
16h 35m
2 stops
POA11:35 pmPorto Alegre Salgado Filho
Aug 18
POA4:40 amPorto Alegre Salgado Filho
20h 00m
2 stops
STL10:40 pmLambert-St Louis
$1,149
GOL
Aug 9
STL5:00 amLambert-St Louis
16h 35m
2 stops
POA11:35 pmPorto Alegre Salgado Filho
Aug 17
POA4:40 amPorto Alegre Salgado Filho
20h 00m
2 stops
STL10:40 pmLambert-St Louis
$1,223
GOL
Aug 8
STL5:00 amLambert-St Louis
16h 35m
2 stops
POA11:35 pmPorto Alegre Salgado Filho
Aug 18
POA4:40 amPorto Alegre Salgado Filho
20h 00m
2 stops
STL10:40 pmLambert-St Louis
$1,229

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 June 21, 2026.
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

Cheapest round-trip
Quickest round-trip

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Sun 8/9

5:00 am-11:35 pm

2 stops16h 35m

Porto Alegre Salgado Filho

Tue 8/18

4:40 am-10:40 pm

2 stops20h 00m

$1,149

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Sun 8/9

5:00 am-11:35 pm

2 stops16h 35m

Porto Alegre Salgado Filho

Mon 8/17

4:40 am-10:40 pm

2 stops20h 00m

$1,223

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Sat 8/8

5:00 am-11:35 pm

2 stops16h 35m

Porto Alegre Salgado Filho

Tue 8/18

4:40 am-10:40 pm

2 stops20h 00m

$1,229

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Tue 8/11

9:15 am-6:20 am

2 stops43h 05m

Porto Alegre Salgado Filho

Wed 8/19

6:40 am-5:53 pm

2 stops37h 13m

$1,304

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 8/10

12:30 pm-2:10 pm

2 stops23h 40m

Porto Alegre Salgado Filho

Mon 8/17

7:35 am-6:27 pm

2 stops36h 52m

$1,308

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 8/10

12:30 pm-2:10 pm

2 stops23h 40m

Porto Alegre Salgado Filho

Wed 8/19

6:40 am-3:38 pm

2 stops34h 58m

$1,311

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Sun 8/9

5:00 am-11:35 pm

2 stops16h 35m

Porto Alegre Salgado Filho

Tue 8/18

4:40 am-10:39 am

2 stops31h 59m

$1,314

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Tue 12/1

4:13 pm-11:25 pm

2 stops28h 12m

Porto Alegre Salgado Filho

Thu 12/3

11:00 am-5:06 pm

2 stops33h 06m

$1,319

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Sun 8/9

5:25 pm-2:10 pm

2 stops42h 45m

Porto Alegre Salgado Filho

Wed 8/19

6:40 am-3:38 pm

2 stops34h 58m

$1,323

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Tue 8/11

5:23 pm-6:20 am

2 stops34h 57m

Porto Alegre Salgado Filho

Fri 8/21

6:40 am-11:38 am

2 stops30h 58m

$1,344

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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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 airline that flies from Lambert-St Louis to Porto Alegre Salgado Filho?

GOL is the most popular carrier operating from Lambert-St Louis to Porto Alegre Salgado Filho

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

Fastest flight time

22h 10m

Direct flights

None
The fastest flight from St. Louis to Porto Alegre takes 22h 10m
There are no direct flights from St. Louis to Porto Alegre. There are no popular flight routes from St. Louis to Porto Alegre.
Search flight deals

Frequently asked questions about flying from St. Louis to Porto Alegre

  • 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 10m 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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