$498 Cheap Flights from Porto Alegre (POA) to St. Louis (STL)

View $498 flight on Fri, Dec 5, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $498 for one-way flights and $992 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Copa
Fri, Nov 21 - Mon, Nov 24
POA
Porto Alegre
STL
St. Louis
$992 Roundtrip, found 5 days ago
$992
Roundtrip
found 5 days ago
Select Copa flight, departing Fri, Nov 21 from Porto Alegre to St. Louis, returning Mon, Nov 24, priced at $992 found 5 days ago
LATAM Airlines Group
Sat, Feb 14 - Sat, Feb 21
POA
Porto Alegre
STL
St. Louis
$1,030 Roundtrip, found 5 days ago
$1,030
Roundtrip
found 5 days ago
Select LATAM Airlines Group flight, departing Sat, Feb 14 from Porto Alegre to St. Louis, returning Sat, Feb 21, priced at $1,030 found 5 days ago
LATAM Airlines Group
Sat, Feb 14 - Sat, Feb 21
POA
Porto Alegre
STL
St. Louis
$1,031 Roundtrip, found 5 days ago
$1,031
Roundtrip
found 5 days ago
Select LATAM Airlines Group flight, departing Sat, Feb 14 from Porto Alegre to St. Louis, returning Sat, Feb 21, priced at $1,031 found 5 days ago
LATAM Airlines Group
Sat, Feb 14 - Sat, Feb 21
POA
Porto Alegre
STL
St. Louis
$1,038 Roundtrip, found 5 days ago
$1,038
Roundtrip
found 5 days ago
Select LATAM Airlines Group flight, departing Sat, Feb 14 from Porto Alegre to St. Louis, returning Sat, Feb 21, priced at $1,038 found 5 days ago
Delta
Fri, Nov 21 - Mon, Nov 24
POA
Porto Alegre
STL
St. Louis
$1,095 Roundtrip, found 5 days ago
$1,095
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Nov 21 from Porto Alegre to St. Louis, returning Mon, Nov 24, priced at $1,095 found 5 days ago
Delta
Fri, Nov 21 - Mon, Nov 24
POA
Porto Alegre
STL
St. Louis
$1,097 Roundtrip, found 5 days ago
$1,097
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Nov 21 from Porto Alegre to St. Louis, returning Mon, Nov 24, priced at $1,097 found 5 days ago
LATAM Airlines Group
Fri, Nov 21 - Mon, Nov 24
POA
Porto Alegre
STL
St. Louis
$1,105 Roundtrip, found 5 days ago
$1,105
Roundtrip
found 5 days ago
Select LATAM Airlines Group flight, departing Fri, Nov 21 from Porto Alegre to St. Louis, returning Mon, Nov 24, priced at $1,105 found 5 days ago
LATAM Airlines Group
Fri, Nov 21 - Mon, Nov 24
POA
Porto Alegre
STL
St. Louis
$1,107 Roundtrip, found 5 days ago
$1,107
Roundtrip
found 5 days ago
Select LATAM Airlines Group flight, departing Fri, Nov 21 from Porto Alegre to St. Louis, returning Mon, Nov 24, priced at $1,107 found 5 days ago
GOL Linhas Aereas S.A.
Fri, Nov 21 - Mon, Nov 24
POA
Porto Alegre
STL
St. Louis
$1,177 Roundtrip, found 5 days ago
$1,177
Roundtrip
found 5 days ago
Select GOL Linhas Aereas S.A. flight, departing Fri, Nov 21 from Porto Alegre to St. Louis, returning Mon, Nov 24, priced at $1,177 found 5 days ago
United
Tue, Nov 18 - Tue, Nov 25
POA
Porto Alegre
STL
St. Louis
$1,244 Roundtrip, found 5 days ago
$1,244
Roundtrip
found 5 days ago
Select United flight, departing Tue, Nov 18 from Porto Alegre to St. Louis, returning Tue, Nov 25, priced at $1,244 found 5 days ago
Flights from Porto Alegre (POA) to St. Louis (STL)
Origin airport
Salgado Filho Intl.
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$992
Distance
5377 mi

Porto Alegre to St. Louis Flights

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

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 Porto Alegre to St. Louis are during the month of November. You can find some of the cheapest flights from Porto Alegre to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Porto Alegre to St. Louis: 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 Porto Alegre to St. Louis

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 Porto Alegre to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $498 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 Porto Alegre to St. Louis 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 Porto Alegre to St. Louis 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 Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL) cost?
Snag a cheap one-way flight from $498 or cheap return flight from $992 from Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL)?
Flying in November may help you find better deals, as it's the cheapest month for flights between POA and STL. You'll often find the lowest prices during the off-season.
What is the cheapest airline that flies from Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll fly you from POA to STL. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from POA to STL?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can change depending 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 Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL) route, fly before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**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 Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until right before your break to book a ticket from POA to STL often results in higher prices. While you may come across some last-minute discounts, they're not always guaranteed. Be flexible with your travel plans to boost your chances of scoring a bargain.
Is it cheaper to book a POA to STL flight and hotel package?
Opting for a POA to STL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Choose from our extensive range of accommodations and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Salgado Filho Intl. Airport (POA) to Lambert-St. Louis Intl. Airport (STL)?
In most cases, you're able to cancel or reschedule your POA to STL flight. However, additional charges may apply, especially if you booked over 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you want further details, visit our Customer Service portal.

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*Available to One Key members.