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Porto Alegre

$1,091+ 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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — POA
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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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 September 16, 2025.

Round-trip from

$1,091
(GOL)
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 September 16, 2025.

This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/129:21 amSTL - POA
2 stops18h 09mDelta
Sat 11/226:00 pmPOA - STL
2 stops25h 07mDelta
Deal found 9/15$1,140
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/58:20 amSTL - POA
2 stops27h 15mUnited Airlines
Sat 11/153:45 pmPOA - STL
2 stops21h 54mUnited Airlines
Deal found 9/14$1,147
This KAYAK deal was found by Cheapflights users on 9/15. 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.
Wed 11/125:12 pmSTL - POA
2 stops27h 13mLATAM Airlines
Sat 11/226:00 pmPOA - STL
2 stops19h 49mLATAM Airlines
Deal found 9/15$1,156
This Mytrip deal was found by Cheapflights users on 9/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/124:05 pmSTL - POA
2 stops21h 30mMultiple Airlines
Sat 11/228:25 amPOA - STL
3 stops29h 36mMultiple Airlines
Deal found 9/15$1,289
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:00 pmSTL - POA
2 stops45h 40mMultiple Airlines
Tue 1/134:40 amPOA - STL
2 stops31h 24mMultiple Airlines
Deal found 9/15$1,530
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/184:05 pmSTL - POA
2 stops25h 05mAir Canada
Wed 1/143:25 pmPOA - STL
3 stops24h 04mAir Canada
Deal found 9/15$2,390
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Wed 11/54:41 pmSTL - POA
2 stops21h 29mAmerican Airlines
Sat 11/157:20 pmPOA - STL
3 stops20h 57mAmerican Airlines
Deal found 9/14$2,598
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 11/1211:42 amSTL - POA
3 stops20h 13mAmerican Airlines
Sat 11/225:35 pmPOA - STL
2 stops24h 54mAmerican Airlines
Deal found 9/15$2,890

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 September 16, 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

Mon 3/2

4:59 pm-4:30 pm

2 stops20h 31m

Porto Alegre Salgado Filho

Wed 3/4

5:20 pm-9:40 pm

2 stops31h 20m

$1,091

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Mon 3/2

4:05 pm-4:10 pm

2 stops21h 05m

Porto Alegre Salgado Filho

Wed 3/4

5:10 pm-3:29 pm

2 stops25h 19m

$1,106

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Wed 11/12

9:21 am-6:30 am

2 stops18h 09m

Porto Alegre Salgado Filho

Sat 11/22

6:00 pm-4:07 pm

2 stops25h 07m

$1,140

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Wed 11/5

8:20 am-2:35 pm

2 stops27h 15m

Porto Alegre Salgado Filho

Sat 11/15

3:45 pm-10:39 am

2 stops21h 54m

$1,147

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Wed 11/12

4:05 pm-4:35 pm

2 stops21h 30m

Porto Alegre Salgado Filho

Sat 11/22

8:25 am-11:01 am

3 stops29h 36m

$1,289

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Thu 12/18

6:00 pm-6:40 pm

2 stops45h 40m

Porto Alegre Salgado Filho

Tue 1/13

4:40 am-9:04 am

2 stops31h 24m

$1,530

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Thu 12/18

4:05 pm-8:10 pm

2 stops25h 05m

Porto Alegre Salgado Filho

Wed 1/14

3:25 pm-12:29 pm

3 stops24h 04m

$2,390

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Wed 11/5

4:41 pm-5:10 pm

2 stops21h 29m

Porto Alegre Salgado Filho

Sat 11/15

7:20 pm-1:17 pm

3 stops20h 57m

$2,598

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

Wed 11/12

11:42 am-10:55 am

3 stops20h 13m

Porto Alegre Salgado Filho

Sat 11/22

5:35 pm-3:29 pm

2 stops24h 54m

$2,890

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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 September 16, 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
1,847 reviews

Food

6.7

Comfort

7.4

Entertainment

7.0

Overall

7.5

Boarding

7.6

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Darrel,Sep 2025

LIM - GRU

The Wi-Fi was not working, so there was no in-flight entertainment. The biggest disappointment was that my Delta diamond status did not transfer any status to my LATAM flight. I WOULD’VE THOUGHT THAT THERE WOULD BE A BETTER WORKING AGREEMENT BETWEEN THE AIRLINES.
LATAM Airlines
7.5
Good
1,847 reviews
LATAM Airlines
7.5
Good
1,847 reviews

Food

6.7

Comfort

7.4

Entertainment

7.0

Overall

7.5

Boarding

7.6

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Darrel,Sep 2025

LIM - GRU

The Wi-Fi was not working, so there was no in-flight entertainment. The biggest disappointment was that my Delta diamond status did not transfer any status to my LATAM flight. I WOULD’VE THOUGHT THAT THERE WOULD BE A BETTER WORKING AGREEMENT BETWEEN THE AIRLINES.

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 GOL, Air Canada, and Delta fly from St. Louis to Porto Alegre in about 18h 09m. The time it takes to get you to your destination can typically vary by up to 2h 56m. 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

Browse thousands of different options on Cheapflights for your next trip

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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
LATAM AirlinesCheapest$1,167Average$1,287FlexibilityNo cancel feeOn-time81%

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