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Cheap flights from St. Louis to Buenos Aires from $1,013

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Buenos Aires departing on 3/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
LATAM Airlines Logo
12:04 pm - 2:00 pm
STL
-
AEP
23h 56m2 stops
LATAM Airlines Logo
11:30 am - 9:05 am
AEP
-
STL
23h 35m2 stops
$1,013LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
12:00 pm - 10:30 am
STL
-
AEP
19h 30m2 stops
LATAM Airlines Logo
3:40 pm - 5:50 pm
AEP
-
STL
29h 10m2 stops
$1,388LATAM Airlines
Sat, Jan 17 - Sun, Jan 25
LATAM Airlines Logo
12:00 pm - 9:40 am
STL
-
AEP
18h 40m2 stops
LATAM Airlines Logo
3:40 pm - 8:53 am
AEP
-
STL
20h 13m2 stops
$1,394LATAM Airlines
Thu, Jan 8 - Mon, Jan 26
LATAM Airlines Logo
12:00 pm - 9:40 am
STL
-
AEP
18h 40m2 stops
LATAM Airlines Logo
3:40 pm - 8:53 am
AEP
-
STL
20h 13m2 stops
$1,553LATAM Airlines
Thu, Jan 8 - Mon, Jan 26
LATAM Airlines Logo
9:59 am - 7:55 am
STL
-
AEP
18h 56m2 stops
LATAM Airlines Logo
5:15 pm - 9:06 am
AEP
-
STL
18h 51m2 stops
$1,571LATAM Airlines
Mon, Feb 9 - Mon, Feb 16
LATAM Airlines Logo
3:45 pm - 11:45 am
STL
-
AEP
41h 00m3 stops
LATAM Airlines Logo
8:25 pm - 11:36 pm
AEP
-
STL
30h 11m2 stops
$1,579LATAM Airlines
Mon, Feb 9 - Mon, Feb 16
LATAM Airlines Logo
1:22 pm - 11:45 am
STL
-
AEP
19h 23m2 stops
LATAM Airlines Logo
5:15 pm - 8:53 am
AEP
-
STL
18h 38m2 stops
$1,713LATAM Airlines
Fri, Jan 2 - Sun, Jan 11
Multiple Airlines Logo
4:05 pm - 3:40 pm
STL
-
AEP
20h 35m2 stops
Multiple Airlines Logo
8:20 am - 3:29 pm
AEP
-
STL
34h 09m2 stops
$2,122Multiple Airlines
Sat, Jan 17 - Sun, Jan 25
Multiple Airlines Logo
4:05 pm - 5:20 pm
STL
-
AEP
22h 15m3 stops
Multiple Airlines Logo
8:20 am - 3:29 pm
AEP
-
STL
34h 09m2 stops
$2,428Multiple Airlines
Sat, Jan 17 - Sun, Jan 25
Multiple Airlines Logo
4:05 pm - 5:20 pm
STL
-
AEP
22h 15m3 stops
Multiple Airlines Logo
8:20 am - 3:29 pm
AEP
-
STL
34h 09m2 stops
$2,728Multiple Airlines
Sat, Jan 17 - Sun, Jan 25

LATAM Airlines flights from St. Louis to Buenos Aires Jorge Newbery Airport

Our best LATAM Airlines deals on St. Louis to Buenos Aires Jorge Newbery Airport flight tickets
LATAM Airlines
Mar 8
STL12:04 pmLambert-St Louis
23h 56m
2 stops
AEP2:00 pmBuenos Aires Jorge Newbery
Mar 17
AEP11:30 amBuenos Aires Jorge Newbery
23h 35m
2 stops
STL9:05 amLambert-St Louis
$1,013
Find similar
LATAM Airlines
Apr 30
STL11:43 amLambert-St Louis
27h 17m
2 stops
AEP5:00 pmBuenos Aires Jorge Newbery
May 4
AEP10:35 amBuenos Aires Jorge Newbery
25h 59m
2 stops
STL10:34 amLambert-St Louis
$1,102
Find similar
LATAM Airlines
Jan 17
STL12:00 pmLambert-St Louis
19h 30m
2 stops
AEP10:30 amBuenos Aires Jorge Newbery
Jan 25
AEP3:40 pmBuenos Aires Jorge Newbery
29h 10m
2 stops
STL5:50 pmLambert-St Louis
$1,388
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Buenos Aires Jorge Newbery Airport 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, momondo users made 832,500 searches. Data last updated December 28, 2025.
Use the filters below to find and compare flights from St. Louis to Buenos Aires Jorge Newbery Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

12:04 pm-2:00 pm

2 stops23h 56m

Buenos Aires Jorge Newbery

Tue 3/17

11:30 am-9:05 am

2 stops23h 35m

$1,013

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/17

12:00 pm-10:30 am

2 stops19h 30m

Buenos Aires Jorge Newbery

Sun 1/25

3:40 pm-5:50 pm

2 stops29h 10m

$1,388

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 1/8

12:00 pm-9:40 am

2 stops18h 40m

Buenos Aires Jorge Newbery

Mon 1/26

3:40 pm-8:53 am

2 stops20h 13m

$1,394

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 1/8

12:00 pm-9:40 am

2 stops18h 40m

Buenos Aires Jorge Newbery

Mon 1/26

3:40 pm-8:53 am

2 stops20h 13m

$1,553

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Mon 2/9

9:59 am-7:55 am

2 stops18h 56m

Buenos Aires Jorge Newbery

Mon 2/16

5:15 pm-9:06 am

2 stops18h 51m

$1,571

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Mon 2/9

3:45 pm-11:45 am

3 stops41h 00m

Buenos Aires Jorge Newbery

Mon 2/16

8:25 pm-11:36 pm

2 stops30h 11m

$1,579

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 1/2

1:22 pm-11:45 am

2 stops19h 23m

Buenos Aires Jorge Newbery

Sun 1/11

5:15 pm-8:53 am

2 stops18h 38m

$1,713

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/17

4:05 pm-3:40 pm

2 stops20h 35m

Buenos Aires Jorge Newbery

Sun 1/25

8:20 am-3:29 pm

2 stops34h 09m

$2,122

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/17

4:05 pm-5:20 pm

3 stops22h 15m

Buenos Aires Jorge Newbery

Sun 1/25

8:20 am-3:29 pm

2 stops34h 09m

$2,428

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/17

4:05 pm-5:20 pm

3 stops22h 15m

Buenos Aires Jorge Newbery

Sun 1/25

8:20 am-3:29 pm

2 stops34h 09m

$2,728

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from St. Louis to Buenos Aires Jorge Newbery Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Buenos Aires Jorge Newbery Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Buenos Aires Jorge Newbery Airport (STL to AEP) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Buenos Aires Jorge Newbery Airport

Fastest flight time

20h 35m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires Jorge Newbery Airport takes 20h 35m
There are no direct flights from St. Louis to Buenos Aires Jorge Newbery Airport. There are no popular flight routes from St. Louis to Buenos Aires Jorge Newbery Airport.
Search flight deals

  • How far is Lambert-St Louis to Buenos Aires Jorge Newbery by plane?

    The distance between Lambert-St Louis and Buenos Aires Jorge Newbery is about 5446.6 mi. In terms of flight time, this usually takes a little over 20h 35m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Buenos Aires Jorge Newbery Airport?

    Prices for flights from Lambert-St Louis Airport to Buenos Aires Jorge Newbery Airport refresh daily.

  • How old do you have to be to fly from Lambert-St Louis Airport to Buenos Aires Jorge Newbery Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Buenos Aires Jorge Newbery Airport.

  • What documentation or ID do you need to fly to Buenos Aires Jorge Newbery Airport?

    The required travel and health documents for your Buenos Aires Jorge Newbery Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Buenos Aires Jorge Newbery Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • How do I get Price Alerts for flights from St. Louis to Buenos Aires Jorge Newbery Airport?

    Search flight deals from St. Louis to Buenos Aires Jorge Newbery Airport. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from St. Louis to Buenos Aires Jorge Newbery Airport with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Buenos Aires?

It is quick and easy to find St. Louis to Buenos Aires flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Buenos Aires that suits you.

Can I find flights from St. Louis to Buenos Aires with flexible booking policies on momondo?

Flights from St. Louis to Buenos Aires with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Buenos Aires?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Buenos Aires.

I’m not ready to book a flight from St. Louis to Buenos Aires right now. Can momondo alert me if prices change?

Price alerts on flights to Buenos Aires from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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