STL - POA

$1,091 Find Cheap Flights from St. Louis to Porto Alegre

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Porto Alegre departing on 3/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Porto Alegre

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Porto Alegre, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Porto Alegre, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Porto Alegre (STL-POA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Porto Alegre that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Porto Alegre

Mon, Mar 2 - Wed, Mar 4
GOL Logo
4:59 pm - 4:30 pmSTL-POA
20h 31m2 stops
GOL Logo
5:20 pm - 9:40 pmPOA-STL
31h 20m2 stops
$1,091GOL
Find Deal
Mon, Mar 2 - Wed, Mar 4
GOL Logo
4:04 pm - 4:30 pmSTL-POA
21h 26m2 stops
GOL Logo
5:20 pm - 9:40 pmPOA-STL
31h 20m2 stops
$1,092GOL
Find Deal
Mon, Mar 2 - Wed, Mar 4
Air Canada Logo
4:05 pm - 4:10 pmSTL-POA
21h 05m2 stops
Air Canada Logo
5:10 pm - 3:29 pmPOA-STL
25h 19m2 stops
$1,106Air Canada
Find Deal
Wed, Nov 12 - Sat, Nov 22
Delta Logo
9:21 am - 6:30 amSTL-POA
18h 09m2 stops
Delta Logo
6:00 pm - 4:07 pmPOA-STL
25h 07m2 stops
$1,140Delta
Find Deal
Wed, Nov 5 - Sat, Nov 15
United Airlines Logo
8:20 am - 2:35 pmSTL-POA
27h 15m2 stops
United Airlines Logo
3:45 pm - 10:39 amPOA-STL
21h 54m2 stops
$1,147United Airlines
Find Deal
Wed, Nov 12 - Sat, Nov 22
LATAM Airlines Logo
5:12 pm - 11:25 pmSTL-POA
27h 13m2 stops
LATAM Airlines Logo
6:00 pm - 10:49 amPOA-STL
19h 49m2 stops
$1,156LATAM Airlines
Find Deal
Wed, Nov 12 - Sat, Nov 22
Multiple Airlines Logo
4:05 pm - 4:35 pmSTL-POA
21h 30m2 stops
Multiple Airlines Logo
8:25 am - 11:01 amPOA-STL
29h 36m3 stops
$1,289Multiple Airlines
Find Deal
Thu, Dec 18 - Tue, Jan 13
Multiple Airlines Logo
6:00 pm - 6:40 pmSTL-POA
45h 40m2 stops
Multiple Airlines Logo
4:40 am - 9:04 amPOA-STL
31h 24m2 stops
$1,530Multiple Airlines
Find Deal
Thu, Dec 18 - Wed, Jan 14
Air Canada Logo
4:05 pm - 8:10 pmSTL-POA
25h 05m2 stops
Air Canada Logo
3:25 pm - 12:29 pmPOA-STL
24h 04m3 stops
$2,390Air Canada
Find Deal
Wed, Nov 5 - Sat, Nov 15
American Airlines Logo
4:41 pm - 5:10 pmSTL-POA
21h 29m2 stops
American Airlines Logo
7:20 pm - 1:17 pmPOA-STL
20h 57m3 stops
$2,598American Airlines
Find Deal

Everything you should know

Top airlines
GOL
Cheapest • from $1,091 (round-trip)
LATAM Airlines
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$1,091
GOL
Mon 3/2Wed 3/4
STL - POA • 2 stops
Cheapest one-way
Multiple Airlines
Tue 9/16
STL - POA • multi-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto Alegre!
Booking Insights

KAYAK's insights & trends for St. Louis to Porto Alegre flights

Get data-powered insights and trends into flights from St. Louis to Porto Alegre to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from St. Louis to Porto Alegre?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from St. Louis to Porto Alegre were found on GOL ($1,091) and Air Canada ($1,106).

Find deals

Good to know

Cheapest flight$1,091
Flight from St. Louis to Porto Alegre

When to book flights from St. Louis to Porto Alegre

Are your dates flexible? Find out the best times to travel from St. Louis to Porto Alegre based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Porto Alegre

  • What is the cheapest flight from St. Louis to Porto Alegre?

    In the last 3 days, the lowest price for a flight from St. Louis to Porto Alegre was $1,091 for a round-trip ticket.

  • Do I need a passport to fly between St. Louis and Porto Alegre?

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Porto Alegre.

  • Which airports will I be using when flying from St. Louis to Porto Alegre?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Porto Alegre, also known as Porto Alegre Salgado Filho.

  • Which aircraft models fly most regularly from St. Louis to Porto Alegre?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Porto Alegre?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between St. Louis and Porto Alegre, with Star Alliance being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from St. Louis to Porto Alegre?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Porto Alegre.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Porto Alegre?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto Alegre from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Porto Alegre?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto Alegre with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and POA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Porto Alegre?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto Alegre from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from St. Louis to Porto Alegre

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Porto Alegre. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Porto Alegre? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.5
LATAM AirlinesOverall score based on 1847 reviews
7.0Entertainment
7.6Boarding
7.4Comfort
8.0Crew
6.7Food
Airline reviews

I’m entitled to a refund per LATAM due to the mid flight itinerary change and being stuck in São Paulo for 24 hours and needing to get a hotel. The airline was dismissive and of no help.

2.0 MediocreAnonymous, Aug 2025GIG - GRU
Read more LATAM Airlines reviews

I’m entitled to a refund per LATAM due to the mid flight itinerary change and being stuck in São Paulo for 24 hours and needing to get a hotel. The airline was dismissive and of no help.

The flight was late. Please do not delay next time.

I couldn't travel, now I can't get a refund and to change the date I have to pay an absurd fine.

Boarding was confusing with a delayed flight because there was no English translation

My biggest complaint is the comfort. I am not tall and there was no legroom. It was very uncomfortable. During my transfer in Sao Paola, the flight was slightly delayed so boarding was confusing because there were no instructions in English.

Bought a ticket that included a bag and they still charged me to check it in, latam is the worst airline.

I never got this flight. You sent me to Chile!!! And from Chile I got the other flight to São Paulo... I've arrived 7h latter than I was supposed to arrive because of Delta delays.

Because the flight was late, we lost the connection to Brazil. You, Delta delayed, and you Delta anticipated the door closing in 15 min from Miami to GRU. Why? It caused a lot of stress! I almost could not see my mother in law alive because of your delay.

Lost ,y connection due to a mechanical delay, huge line to get new connection and vouchers

Boarding was done by woman who insisted on strict standing in line policy; food was ok; entertainment minimal

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

Information on your arrival and departure airports

St. Louis (STL)
Porto Alegre (POA)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.