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Porto Alegre

$1,485+ Cheap flights from St. Louis (STL) to Porto Alegre (POA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — POA
dic. 6 — dic. 131
sáb. 12/6
sáb. 12/13
1 adult, Economy
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Find flight deals from St. Louis to Porto Alegre

Cheapest flights from St. Louis to Porto Alegre
Explore the most affordable flight options available from St. Louis to Porto Alegre. Find the lowest fares from popular airlines and budget airlines, with prices last updated on noviembre 6, 2025.

This KAYAK deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/126:00 amSTL - POA
2 stops21h 30mLATAM Airlines
sáb. 11/226:00 pmPOA - STL
2 stops27h 35mLATAM Airlines
Deal found 11/5$1,485
This American Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/1210:44 amSTL - POA
3 stops20h 11mAmerican Airlines
sáb. 11/225:35 pmPOA - STL
2 stops24h 54mAmerican Airlines
Deal found 11/5$2,796

Cheap flight deals from St. Louis to Porto Alegre

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Porto Alegre (POA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated noviembre 6, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,106
(Air Canada)
Provider with most accurate pricing for Lambert-St Louis-Porto Alegre Salgado Filho flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Porto Alegre Salgado Filho flights.
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From Lambert-St Louis to Porto Alegre Salgado Filho
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Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated noviembre 6, 2025.
Use the filters below to find and compare flights from St. Louis to Porto Alegre that are best for you.

Fly from

St. Louis

Fly to

Porto Alegre

Route

Depart

Return

Price

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

mié. 11/12

6:00 am-6:30 am

2 stops21h 30m

Porto Alegre Salgado Filho

sáb. 11/22

6:00 pm-6:35 pm

2 stops27h 35m

$1,485

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

mié. 11/12

10:44 am-9:55 am

3 stops20h 11m

Porto Alegre Salgado Filho

sáb. 11/22

5:35 pm-3:29 pm

2 stops24h 54m

$2,796

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Compare providers for flights from St. Louis to Porto Alegre

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Porto Alegre in November.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Porto Alegre flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Porto Alegre flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Porto Alegre flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Porto Alegre flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Porto Alegre flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Porto Alegre

Have a flexible travel schedule? Discover the best time to fly to Porto Alegre from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Porto Alegre

Get insights into the airlines that provide service to Porto Alegre. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto Alegre. Reviews last updated noviembre 6, 2025.
See what other customers who have flown with LATAM Airlines from St. Louis to Porto Alegre have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
LATAM Airlines
7.5
Good
1,873 reviews

Overall

7.5

Food

6.7

Crew

8.0

Boarding

7.6

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Oct 2025

MIA - GRU

Terrible baggage service! Almost lost my connection flight in SP
LATAM Airlines
7.5
Good
1,873 reviews
LATAM Airlines
7.5
Good
1,873 reviews

Overall

7.5

Food

6.7

Crew

8.0

Boarding

7.6

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Oct 2025

MIA - GRU

Terrible baggage service! Almost lost my connection flight in SP

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Porto Alegre. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from St. Louis to Porto Alegre?

    Airlines like LATAM Airlines and American Airlines fly from St. Louis to Porto Alegre in about 20h 11m. The time it takes to get you to your destination can typically vary by up to 1h 19m. There are 5375 mi between St. Louis and Porto Alegre. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from St. Louis to Porto Alegre that include hotel bookings?

    Yes. In addition to deals on St. Louis to Porto Alegre flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Porto Alegre?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Porto Alegre.

  • Can I find deals for business class flights from St. Louis to Porto Alegre?

    Yes. Cheapflights offers flight deals from St. Louis to Porto Alegre by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Complete your trip

Complete your trip to Porto Alegre by adding a car rental and/or hotel reservation to your travel itinerary.
Porto Alegre car rentals
Porto Alegre Salgado Filho Airport car rentals

Top airline flying from St. Louis to Porto Alegre

Discover the top airline that operate flights from St. Louis to Porto Alegre. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated noviembre 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
LATAM AirlinesCheapest$1,167Average$1,287FlexibilityNo cancel feeOn-time81%

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