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.

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 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.

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.

$1,487+ Flights from St. Louis to Porto Alegre

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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

Round-trip from	$1,490 (Delta)

From Lambert-St Louis to Porto Alegre Salgado Filho

Search Deals

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 July 1, 2025.

Mon 7/71:29 pmSTL - POA

2 stops28h 21mLATAM Airlines

Mon 7/147:20 amPOA - STL

2 stops18h 33mLATAM Airlines

Deal found 6/30

$1,487

Thu 7/108:25 amSTL - POA

2 stops26h 55mUnited Airlines

Thu 7/175:35 pmPOA - STL

2 stops25h 24mUnited Airlines

Deal found 6/30

$1,495

Thu 7/1010:47 amSTL - POA

3 stops22h 43mMultiple Airlines

Tue 7/1512:35 pmPOA - STL

2 stops28h 41mMultiple Airlines

Deal found 6/30

$2,555

Tue 7/81:19 pmSTL - POA

3 stops22h 06mAmerican Airlines

Tue 7/156:35 pmPOA - STL

2 stops24h 12mAmerican Airlines

Deal found 6/30

$2,634

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 July 1, 2025.

Fri 7/117:11 pmSTL - POA

2 stops33h 14mDelta

Mon 7/147:20 amPOA - STL

2 stops18h 33mDelta

Deal found 6/30

$1,490

Fri 7/111:29 pmSTL - POA

2 stops28h 21mLATAM Airlines

Thu 7/1710:10 amPOA - STL

2 stops33h 56mLATAM Airlines

Deal found 6/30

$1,492

Fri 7/113:20 pmSTL - POA

2 stops23h 30mUnited Airlines

Fri 7/181:55 pmPOA - STL

2 stops26h 42mUnited Airlines

Deal found 6/30

$1,521

Last-minute flights from St. Louis to Porto Alegre
Discover last-minute flight deals from St. Louis to Porto Alegre. Data last updated July 1, 2025 and is based on user searches.

Mon 7/71:29 pmSTL - POA

2 stops28h 21mLATAM Airlines

Mon 7/147:20 amPOA - STL

2 stops18h 33mLATAM Airlines

Deal found 6/30

$1,487

Tue 7/81:19 pmSTL - POA

3 stops22h 06mAmerican Airlines

Tue 7/156:35 pmPOA - STL

2 stops24h 12mAmerican Airlines

Deal found 6/30

$2,634

Thu 7/108:25 amSTL - POA

2 stops26h 55mUnited Airlines

Thu 7/175:35 pmPOA - STL

2 stops25h 24mUnited Airlines

Deal found 6/30

$1,495

Thu 7/1010:47 amSTL - POA

3 stops22h 43mMultiple Airlines

Tue 7/1512:35 pmPOA - STL

2 stops28h 41mMultiple Airlines

Deal found 6/30

$2,555

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

Fri 7/11

7:11 pm-6:25 am

2 stops33h 14m

Porto Alegre Salgado Filho

Mon 7/14

7:20 am-11:53 pm

2 stops18h 33m

$1,490

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Fri 7/11

1:29 pm-7:50 pm

2 stops28h 21m

Porto Alegre Salgado Filho

Thu 7/17

10:10 am-6:06 pm

2 stops33h 56m

$1,492

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Fri 7/11

3:20 pm-4:50 pm

2 stops23h 30m

Porto Alegre Salgado Filho

Fri 7/18

1:55 pm-2:37 pm

2 stops26h 42m

$1,521

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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 Delta, LATAM Airlines, and United 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.

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,973 reviews

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

LATAM Airlines

7.5

Good

1,801 reviews

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,858 reviews

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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

Other flights to Porto Alegre

Porto Alegre to Sao Paulo Guarulhos Intl Airport flights

Porto Alegre to Sao Paulo Congonhas Airport flights

Porto Alegre to Sao Paulo Guarulhos Intl Airport flights

Porto Alegre to Lisbon flights

Porto Alegre to Sao Paulo Guarulhos Intl Airport flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$1,487+ 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 7/7. 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

Round-trip 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 July 1, 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 July 1, 2025.

Cheapflights Fare Finder

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

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 Delta, LATAM Airlines, and United 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.

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 July 1, 2025.