$463 Cheap Flights from St. Louis (STL) to Porto Alegre (POA)

View $463 flight on Tue, Dec 2, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Salgado Filho Intl. Airport (POA)

Cheap Flights from St. Louis to Porto Alegre (STL-POA)

Prices were available within the past 7 days and start at $463 for one-way flights and $913 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Sun, Oct 12 - Tue, Oct 28
STL
St. Louis
POA
Porto Alegre
$913 Roundtrip, found 3 days ago
$913
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Oct 12 from St. Louis to Porto Alegre, returning Tue, Oct 28, priced at $913 found 3 days ago
Air Canada
Wed, Dec 3 - Tue, Dec 9
STL
St. Louis
POA
Porto Alegre
$915 Roundtrip, found 3 days ago
$915
Roundtrip
found 3 days ago
Select Air Canada flight, departing Wed, Dec 3 from St. Louis to Porto Alegre, returning Tue, Dec 9, priced at $915 found 3 days ago
Air Canada
Sun, Oct 12 - Mon, Oct 27
STL
St. Louis
POA
Porto Alegre
$918 Roundtrip, found 3 days ago
$918
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Oct 12 from St. Louis to Porto Alegre, returning Mon, Oct 27, priced at $918 found 3 days ago
Copa
Wed, Jan 28 - Fri, Feb 13
STL
St. Louis
POA
Porto Alegre
$949 Roundtrip, found 4 days ago
$949
Roundtrip
found 4 days ago
Select Copa flight, departing Wed, Jan 28 from St. Louis to Porto Alegre, returning Fri, Feb 13, priced at $949 found 4 days ago
Air Canada
Tue, Jan 6 - Mon, Jan 26
STL
St. Louis
POA
Porto Alegre
$975 Roundtrip, found 4 days ago
$975
Roundtrip
found 4 days ago
Select Air Canada flight, departing Tue, Jan 6 from St. Louis to Porto Alegre, returning Mon, Jan 26, priced at $975 found 4 days ago
Air Canada
Fri, Jan 16 - Tue, Jan 27
STL
St. Louis
POA
Porto Alegre
$980 Roundtrip, found 4 days ago
$980
Roundtrip
found 4 days ago
Select Air Canada flight, departing Fri, Jan 16 from St. Louis to Porto Alegre, returning Tue, Jan 27, priced at $980 found 4 days ago
Copa
Sat, Jan 31 - Fri, Feb 13
STL
St. Louis
POA
Porto Alegre
$983 Roundtrip, found 4 days ago
$983
Roundtrip
found 4 days ago
Select Copa flight, departing Sat, Jan 31 from St. Louis to Porto Alegre, returning Fri, Feb 13, priced at $983 found 4 days ago
Delta
Wed, Jan 21 - Mon, Feb 9
STL
St. Louis
POA
Porto Alegre
$1,048 Roundtrip, found 4 days ago
$1,048
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, Jan 21 from St. Louis to Porto Alegre, returning Mon, Feb 9, priced at $1,048 found 4 days ago
United
Mon, Jan 19 - Mon, Feb 9
STL
St. Louis
POA
Porto Alegre
$1,057 Roundtrip, found 4 days ago
$1,057
Roundtrip
found 4 days ago
Select United flight, departing Mon, Jan 19 from St. Louis to Porto Alegre, returning Mon, Feb 9, priced at $1,057 found 4 days ago
LATAM Airlines Group
Tue, Dec 16 - Thu, Jan 22
STL
St. Louis
POA
Porto Alegre
$1,118 Roundtrip, found 5 days ago
$1,118
Roundtrip
found 5 days ago
Select LATAM Airlines Group flight, departing Tue, Dec 16 from St. Louis to Porto Alegre, returning Thu, Jan 22, priced at $1,118 found 5 days ago

Alternative airports near Porto Alegre

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Salgado Filho Intl. POA. Cheapest and Closest option available. Average driving time to city center is 23 minutes. Flights from $1,310
POA
Salgado Filho Intl.
CheapestClosest
Average driving time to city center23 min
Flights from $1,310
Flights from St. Louis (STL) to Porto Alegre (POA)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Salgado Filho Intl.
Airlines serving
Air Canada, GOL Linhas Aereas S.A., LATAM Airlines Group
Roundtrip price
$913
Distance
5377 mi

St. Louis to Porto Alegre Flights

The cheapest times to fly from St. Louis to Porto Alegre

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Porto Alegre are during the month of October. You can find some of the cheapest flights from St. Louis to Porto Alegre with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Porto Alegre

Sunday is one of the best days to book for cheap flights from St. Louis to Porto Alegre: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Porto Alegre

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Porto Alegre in 2025. You can also book with separate airlines for your outbound and return journeys, from $463 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Porto Alegre flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Porto Alegre airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA) cost?
Secure a cheap one-way flight from $463 or cheap return flight from $913 from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA)?
Planning your getaway for October is a great way to save, as it's the cheapest month for flights between STL and POA. You'll typically find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA)?
To find the cheapest airline that'll fly you from STL to POA, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA)?
You'll have to hop on a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from STL to POA?
Generally you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* However, this can change based on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA)?
To land at Salgado Filho Intl. Airport (POA) without delays, select a flight that takes off from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA) last-minute?
Booking your plane ticket from STL to POA right before your trip is typically more expensive. However, if you're flexible with your departure times and dates, you could land a cheap last-minute fare.
Is it cheaper to book a STL to POA flight and hotel package?
Securing a STL to POA flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Choose from our wide range of accommodations and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Salgado Filho Intl. Airport (POA)?
Generally, it's possible to reschedule or cancel your STL to POA flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.