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Cheap flights from St. Louis to Buenos Aires from $375

This is the cheapest one-way 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 12/11. 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

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LATAM Airlines Logo
3:45 pm - 6:40 pmSTL-AEP
23h 55m2 stops
LATAM Airlines Logo
11:30 am - 10:50 amAEP-STL
25h 20m2 stops
$830LATAM Airlines
Find Deal
Mon, Jan 12 - Tue, Mar 24
LATAM Airlines Logo
9:33 am - 2:40 pmSTL-AEP
26h 07m2 stops
LATAM Airlines Logo
8:50 am - 6:35 pmAEP-STL
36h 45m2 stops
$855LATAM Airlines
Find Deal
Tue, Nov 18 - Wed, Nov 26
LATAM Airlines Logo
7:05 pm - 5:00 pmSTL-AEP
19h 55m2 stops
LATAM Airlines Logo
5:15 pm - 10:50 amAEP-STL
19h 35m2 stops
$880LATAM Airlines
Find Deal
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
9:33 am - 7:55 amSTL-AEP
19h 22m2 stops
LATAM Airlines Logo
3:40 pm - 9:59 amAEP-STL
21h 19m2 stops
$927LATAM Airlines
Find Deal
Tue, Nov 18 - Wed, Nov 26
LATAM Airlines Logo
12:00 pm - 2:00 pmSTL-AEP
23h 00m2 stops
LATAM Airlines Logo
5:15 pm - 5:50 pmAEP-STL
27h 35m2 stops
$930LATAM Airlines
Find Deal
Sat, Jan 17 - Sun, Jan 25
LATAM Airlines Logo
7:05 pm - 5:00 pmSTL-AEP
19h 55m2 stops
LATAM Airlines Logo
8:25 pm - 11:40 pmAEP-STL
29h 15m2 stops
$996LATAM Airlines
Find Deal
Thu, Mar 12 - Mon, Mar 16
LATAM Airlines Logo
5:17 pm - 5:00 pmSTL-AEP
20h 43m2 stops
LATAM Airlines Logo
3:40 pm - 10:45 amAEP-STL
22h 05m2 stops
$1,000LATAM Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
LATAM Airlines Logo
3:45 pm - 4:00 pmSTL-AEP
21h 15m2 stops
LATAM Airlines Logo
3:40 pm - 11:04 amAEP-STL
22h 24m2 stops
$1,002LATAM Airlines
Find Deal
Fri, Jan 9 - Fri, Jan 16
Multiple Airlines Logo
4:05 pm - 5:40 amSTL-AEP
34h 35m3 stops
Multiple Airlines Logo
5:20 am - 1:52 pmAEP-STL
35h 32m3 stops
$1,295Multiple Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
Multiple Airlines Logo
1:00 pm - 11:40 amSTL-AEP
43h 40m3 stops
Multiple Airlines Logo
8:00 pm - 3:29 pmAEP-STL
46h 29m2 stops
$1,587Multiple Airlines
Find Deal
Sat, Jan 31 - Sun, Feb 15

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
Jan 12
STL3:45 pmLambert-St Louis
23h 55m
2 stops
AEP6:40 pmBuenos Aires Jorge Newbery
Mar 24
AEP11:30 amBuenos Aires Jorge Newbery
25h 20m
2 stops
STL10:50 amLambert-St Louis
$830
Find similar
LATAM Airlines
Nov 18
STL9:33 amLambert-St Louis
26h 07m
2 stops
AEP2:40 pmBuenos Aires Jorge Newbery
Nov 26
AEP8:50 amBuenos Aires Jorge Newbery
36h 45m
2 stops
STL6:35 pmLambert-St Louis
$855
Find similar
LATAM Airlines
Mar 8
STL7:05 pmLambert-St Louis
19h 55m
2 stops
AEP5:00 pmBuenos Aires Jorge Newbery
Mar 17
AEP5:15 pmBuenos Aires Jorge Newbery
19h 35m
2 stops
STL10:50 amLambert-St Louis
$880
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 October 30, 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

Mon 1/12

3:45 pm-6:40 pm

2 stops23h 55m

Buenos Aires Jorge Newbery

Tue 3/24

11:30 am-10:50 am

2 stops25h 20m

$830

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 11/18

9:33 am-2:40 pm

2 stops26h 07m

Buenos Aires Jorge Newbery

Wed 11/26

8:50 am-6:35 pm

2 stops36h 45m

$855

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

7:05 pm-5:00 pm

2 stops19h 55m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-10:50 am

2 stops19h 35m

$880

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 11/18

9:33 am-7:55 am

2 stops19h 22m

Buenos Aires Jorge Newbery

Wed 11/26

3:40 pm-9:59 am

2 stops21h 19m

$927

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/17

12:00 pm-2:00 pm

2 stops23h 00m

Buenos Aires Jorge Newbery

Sun 1/25

5:15 pm-5:50 pm

2 stops27h 35m

$930

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 3/12

7:05 pm-5:00 pm

2 stops19h 55m

Buenos Aires Jorge Newbery

Mon 3/16

8:25 pm-11:40 pm

2 stops29h 15m

$996

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 11/26

5:17 pm-5:00 pm

2 stops20h 43m

Buenos Aires Jorge Newbery

Wed 12/3

3:40 pm-10:45 am

2 stops22h 05m

$1,000

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 1/9

3:45 pm-4:00 pm

2 stops21h 15m

Buenos Aires Jorge Newbery

Fri 1/16

3:40 pm-11:04 am

2 stops22h 24m

$1,002

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 11/26

4:05 pm-5:40 am

3 stops34h 35m

Buenos Aires Jorge Newbery

Wed 12/3

5:20 am-1:52 pm

3 stops35h 32m

$1,295

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/31

1:00 pm-11:40 am

3 stops43h 40m

Buenos Aires Jorge Newbery

Sun 2/15

8:00 pm-3:29 pm

2 stops46h 29m

$1,587

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Buenos Aires Jorge Newbery Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Lambert-St Louis to Buenos Aires Jorge Newbery?

LATAM Airlines is the most popular carrier operating from Lambert-St Louis to Buenos Aires Jorge Newbery

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

Direct flights

None
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.
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  • 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 16h 43m.

  • 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.

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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