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Cheap flights from St. Louis to Porto Alegre from $1,106

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 3/2. 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 St. Louis to Porto Alegre

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
4:05 pm - 4:30 pmSTL-POA
21h 25m2 stops
Air Canada Logo
3:30 pm - 3:29 pmPOA-STL
26h 59m2 stops
$1,106Air Canada
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Mon, Mar 2 - Wed, Mar 4

LATAM Airlines flights from St. Louis to Porto Alegre

Our best LATAM Airlines deals on St. Louis to Porto Alegre flight tickets
LATAM Airlines
Nov 12
STL6:00 amLambert-St Louis
21h 30m
2 stops
POA6:30 amPorto Alegre Salgado Filho
Nov 22
POA6:00 pmPorto Alegre Salgado Filho
27h 35m
2 stops
STL6:35 pmLambert-St Louis
$1,485
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LATAM Airlines
Nov 12
STL5:17 pmLambert-St Louis
28h 23m
3 stops
POA12:40 amPorto Alegre Salgado Filho
Nov 22
POA7:45 amPorto Alegre Salgado Filho
17h 13m
2 stops
STL9:58 pmLambert-St Louis
$1,496
Find similar

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 November 5, 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 3/2

4:05 pm-4:30 pm

2 stops21h 25m

Porto Alegre Salgado Filho

Wed 3/4

3:30 pm-3:29 pm

2 stops26h 59m

$1,106

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

Direct flights

None
There are no direct flights from St. Louis to Porto Alegre. There are no popular flight routes from St. Louis to Porto Alegre.
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  • 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 21h 25m 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 many operators does momondo search for flights from Lambert-St Louis Airport to Porto Alegre Salgado Filho Airport?

  • 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.

  • What is the most popular airline from St. Louis to Porto Alegre?

Best airlines flying from St. Louis to Porto Alegre

Compare and see reviews for airlines that fly from St. Louis to Porto Alegre with momondo
Airline
Rating
Free Cancellation
Price
LATAM AirlinesPriceFrom $1,167Free CancellationRating
7.5
1,874 reviews
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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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