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Porto Alegre

$1,106+ 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
nov 23 — nov 301
dom 11/23
dom 11/30
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 outubro 24, 2025.

This United Airlines deal was found by Cheapflights users on 10/22. 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.
seg 11/311:20 amSTL - POA
2 stops23h 45mUnited Airlines
seg 11/175:10 pmPOA - STL
2 stops20h 27mUnited Airlines
Deal found 10/22$1,421
This KAYAK deal was found by Cheapflights users on 10/23. 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.
qua 11/129:33 amSTL - POA
2 stops23h 02mLATAM Airlines
sáb 11/227:45 amPOA - STL
2 stops17h 13mLATAM Airlines
Deal found 10/23$1,458
This Ovago deal was found by Cheapflights users on 10/22. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 11/37:05 amSTL - POA
3 stops23h 15mLATAM Airlines
seg 11/176:40 pmPOA - STL
2 stops19h 03mLATAM Airlines
Deal found 10/22$1,590
This Orbitz deal was found by Cheapflights users on 10/22. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 11/34:41 pmSTL - POA
2 stops22h 09mMultiple Airlines
dom 11/164:40 amPOA - STL
2 stops40h 55mMultiple Airlines
Deal found 10/22$3,033
This American Airlines deal was found by Cheapflights users on 10/22. 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.
seg 11/310:44 amSTL - POA
3 stops21h 11mAmerican Airlines
seg 11/175:50 pmPOA - STL
3 stops20h 52mAmerican Airlines
Deal found 10/22$3,924
This Ovago deal was found by Cheapflights users on 10/23. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 11/123:50 pmSTL - POA
2 stops40h 45mMultiple Airlines
sex 11/211:35 amPOA - STL
2 stops35h 32mMultiple Airlines
Deal found 10/23$10,123

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 outubro 24, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
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.
Search Deals
From Lambert-St Louis to Porto Alegre Salgado Filho
Search Deals

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 outubro 24, 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

seg 3/2

4:05 pm-4:30 pm

2 stops21h 25m

Porto Alegre Salgado Filho

qua 3/4

3:30 pm-3:29 pm

2 stops26h 59m

$1,106

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

qui 1/1

6:00 am-5:05 pm

2 stops32h 05m

Porto Alegre Salgado Filho

qua 1/14

4:40 am-11:40 pm

3 stops22h 00m

$1,223

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

seg 11/3

11:20 am-2:05 pm

2 stops23h 45m

Porto Alegre Salgado Filho

seg 11/17

5:10 pm-10:37 am

2 stops20h 27m

$1,421

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

seg 11/3

4:41 pm-5:10 pm

2 stops21h 29m

Porto Alegre Salgado Filho

seg 11/17

5:50 pm-12:37 pm

2 stops21h 47m

$1,421

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

qui 1/1

6:00 am-7:20 pm

2 stops34h 20m

Porto Alegre Salgado Filho

qua 1/14

4:30 am-11:05 am

2 stops33h 35m

$1,438

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

qua 11/12

9:33 am-11:35 am

2 stops23h 02m

Porto Alegre Salgado Filho

sáb 11/22

7:45 am-9:58 pm

2 stops17h 13m

$1,458

St. LouisPorto Alegre

STL - POA

STLPOA

Lambert-St Louis

seg 11/3

7:05 am-9:20 am

3 stops23h 15m

Porto Alegre Salgado Filho

seg 11/17

6:40 pm-10:43 am

2 stops19h 03m

$1,590

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

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 October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Porto Alegre flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 outubro 24, 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
1,871 reviews

Overall

7.5

Entertainment

7.0

Boarding

7.6

Food

6.7

Crew

8.0

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

LUIS JOSE,Oct 2025

LIM - AEP

Smiles because se upgraded to premiums economy. That was similar to LAN economy years ahí!
LATAM Airlines
7.5
Good
1,871 reviews
LATAM Airlines
7.5
Good
1,871 reviews

Overall

7.5

Entertainment

7.0

Boarding

7.6

Food

6.7

Crew

8.0

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

LUIS JOSE,Oct 2025

LIM - AEP

Smiles because se upgraded to premiums economy. That was similar to LAN economy years ahí!

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 Air Canada and LATAM Airlines fly from St. Louis to Porto Alegre in about 21h 25m. The time it takes to get you to your destination can typically vary by up to 10h 40m. 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 outubro 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
LATAM AirlinesCheapest$1,167Average$1,287FlexibilityNo cancel feeOn-time81%

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