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

Airlines like United Airlines fly from St. Louis to Porto Alegre in about 41h 31m. The time it takes to get you to your destination can typically vary by up to . There are 5375 mi between St. Louis and Porto Alegre.

In terms of precipitation, rainfall in Porto Alegre ranges from 2.8 - 5.1 inches per month. September is typically the wettest month, when rainfall can reach 5.1 in. November is typically the driest time to visit Porto Alegre when rainfall is around 2.8 in.

If weather is an important factor for your trip to Porto Alegre, use this chart to help with planning. For those seeking warmer temperatures, February is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of June, when temperatures are typically at their lowest (around 55.4 F).

What is the cheapest time of day to fly from STL to POA?

When flying from St. Louis to Porto Alegre, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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.

$1,165+ Flights from St. Louis to Porto Alegre

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Cheap flight deals from St. Louis to Porto Alegre

Best flights from St. Louis to Porto Alegre
Discover carefully curated flight deals from St. Louis to Porto Alegre that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 8, 2025.

Sun 3/86:34 pmSTL - POA

2 stops41h 31mUnited Airlines

Wed 3/113:30 pmPOA - STL

2 stops19h 51mUnited Airlines

Deal found 12/5

$1,165

Find flight deals from St. Louis to Porto Alegre

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$1,165 (United Airlines)

Provider with most accurate pricing for Lambert-St Louis-Porto Alegre Salgado Filho flight deals.

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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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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

Sun 3/8

6:34 pm-2:05 pm

2 stops41h 31m

Porto Alegre Salgado Filho

Wed 3/11

3:30 pm-9:21 am

2 stops19h 51m

$1,165

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/5

Compare providers for flights from St. Louis to Porto Alegre

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 December.

Provider	Price Accuracy	Trust Score*
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust 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

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

1,889 reviews

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

1,889 reviews

LATAM Airlines

7.5

Good

1,889 reviews

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

How long is the flight from St. Louis to Porto Alegre?
Airlines like United Airlines fly from St. Louis to Porto Alegre in about 41h 31m. The time it takes to get you to your destination can typically vary by up to . There are 5375 mi between St. Louis and Porto Alegre.
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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Porto Alegre Salgado Filho Airport car rentals

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Top airline flying from St. Louis to Porto Alegre

Airline	Cheapest	Average	Flexibility	On-time
LATAM Airlines	Cheapest$1,167	Average$1,262	FlexibilityNo cancel fee	On-time81%

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$1,165+ 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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Porto Alegre with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Porto Alegre

Best flights from St. Louis to Porto AlegreDiscover carefully curated flight deals from St. Louis to Porto Alegre that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 8, 2025.

Discover carefully curated flight deals from St. Louis to Porto Alegre that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 8, 2025.

Find flight deals from St. Louis to Porto Alegre

Most accurate provider

Most trusted provider

Round-trip from

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Use the filters below to find and compare flights from St. Louis to Porto Alegre that are best for you.

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 December.

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.

Reviews of airlines servicing Porto Alegre

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.

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?

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

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

Top airline flying from St. Louis to Porto Alegre

100% Free

Book with Flexibility

Travel Smart

Best flights from St. Louis to Porto Alegre
Discover carefully curated flight deals from St. Louis to Porto Alegre that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 8, 2025.