What is the cheapest day to fly from St. Louis to Porto Alegre?

Travelers seeking maximum savings on their St. Louis to Porto Alegre flight should consider departing on Thursday afternoons when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly round-trip from St. Louis to Porto Alegre?

Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 15% on the overall cost on flights from St. Louis to Porto Alegre.

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

One of the essential ways to save on airfare from St. Louis to Porto Alegre is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 14% on airfare.

Most accurate provider : When it comes to deals on St. Louis-Porto Alegre flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-Porto Alegre flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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.

$473+ Flights from St. Louis to Porto Alegre

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1. Tell us where you want to go

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2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from St. Louis to Porto Alegre

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$1,140 (Ovago)
One-way from	$473 (Delta)

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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One-way flight from Lambert-St Louis to Porto Alegre Salgado Filho

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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 April 30, 2025.

Sat 5/177:05 amSTL - POA

3 stops34h 45mLATAM Airlines

Fri 5/304:40 amPOA - STL

2 stops33h 14mLATAM Airlines

Deal found 4/29

$1,140

Sat 5/1710:31 amSTL - POA

3 stops21h 54mAmerican Airlines

Fri 5/307:25 pmPOA - STL

3 stops19h 42mAmerican Airlines

Deal found 4/29

$3,657

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 April 30, 2025.

Sat 5/177:05 amSTL - POA

3 stops34h 45mLATAM Airlines

Fri 5/304:40 amPOA - STL

2 stops33h 14mLATAM Airlines

Deal found 4/29

$1,140

Sat 5/1710:31 amSTL - POA

3 stops21h 54mAmerican Airlines

Fri 5/307:25 pmPOA - STL

3 stops19h 42mAmerican Airlines

Deal found 4/29

$3,657

Last-minute flights from St. Louis to Porto Alegre
Discover last-minute flight deals from St. Louis to Porto Alegre. Data last updated April 30, 2025 and is based on user searches.

Sat 5/177:05 amSTL - POA

3 stops34h 45mLATAM Airlines

Fri 5/304:40 amPOA - STL

2 stops33h 14mLATAM Airlines

Deal found 4/29

$1,140

Sat 5/1710:31 amSTL - POA

3 stops21h 54mAmerican Airlines

Fri 5/307:25 pmPOA - STL

3 stops19h 42mAmerican Airlines

Deal found 4/29

$3,657

One-way flights from St. Louis to Porto Alegre
Search for one-way flight options from St. Louis to Porto Alegre. Find affordable one-way fares based on user searches. Data last updated April 30, 2025.

Mon 5/195:40 pmSTL - POA

2 stops18h 10mDelta

Deal found 4/29

$473

Mon 5/191:59 pmSTL - POA

3 stops21h 26mAmerican Airlines

Deal found 4/29

$1,924

Cheapflights Fare Finder

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

Sat 5/17

7:05 am-7:50 pm

3 stops34h 45m

Porto Alegre Salgado Filho

Fri 5/30

4:40 am-11:54 am

2 stops33h 14m

$1,140

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Sat 5/17

10:31 am-10:25 am

3 stops21h 54m

Porto Alegre Salgado Filho

Fri 5/30

7:25 pm-1:07 pm

3 stops19h 42m

$3,657

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 5/19

5:40 pm-1:50 pm

2 stops18h 10m

$473

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 5/19

1:59 pm-1:25 pm

3 stops21h 26m

$1,924

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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 April.

Provider	Price Accuracy	Trust Score*
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars

*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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-Porto Alegre flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Porto Alegre

Rainfall in Porto Alegre by month

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.

Temperature in Porto Alegre by month

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).

Reviews of airlines servicing Porto Alegre

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

7,929 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

LATAM Airlines

7.5

Good

1,767 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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.

Browse thousands of different options on Cheapflights for your next trip

Complete your trip

Porto Alegre car rentals

Porto Alegre Salgado Filho Airport car rentals

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$473+ Cheap flights from St. Louis (STL) to Porto Alegre (POA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/19. 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

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Find flight deals from St. Louis to Porto Alegre

Cheapest flights from St. Louis to Porto AlegreExplore 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 April 30, 2025.

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 April 30, 2025.

Cheapflights Fare Finder

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 April.

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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Porto Alegre

Rainfall in Porto Alegre by month

Plan your trip to Porto Alegre by taking into account the average rainfall totals by month.

Temperature in Porto Alegre by month

Plan your trip to Porto Alegre by taking into account the average temperature totals by month.

Reviews of airlines servicing Porto Alegre

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.

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.

100% Free

Book with Flexibility

Travel Smart

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 April 30, 2025.