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Cheap flights from St. Louis to Buenos Aires from $401

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 8/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from St. Louis to Buenos Aires

Cheap round-trip flights

Enter your travel dates to find the best prices.
LATAM Airlines Logo
3:40 pm - 7:40 pm
STL
-
AEP
25h 00m
2 stops
LATAM Airlines Logo
8:05 pm - 5:06 pm
AEP
-
STL
24h 01m
2 stops
$1,148LATAM Airlines
Wed, Jan 6 - Tue, Jan 19
LATAM Airlines Logo
4:40 pm - 4:00 pm
STL
-
AEP
20h 20m
2 stops
LATAM Airlines Logo
8:40 am - 10:48 am
AEP
-
STL
29h 08m
2 stops
$1,172LATAM Airlines
Wed, Dec 2 - Thu, Dec 17
Delta Logo
6:00 am - 7:40 am
STL
-
AEP
22h 40m
2 stops
Delta Logo
5:35 pm - 10:48 am
AEP
-
STL
20h 13m
2 stops
$1,188Delta
Sat, Nov 7 - Thu, Nov 19
LATAM Airlines Logo
5:23 pm - 4:00 pm
STL
-
AEP
20h 37m
2 stops
LATAM Airlines Logo
5:35 pm - 11:46 am
AEP
-
STL
20h 11m
2 stops
$1,228LATAM Airlines
Wed, Aug 19 - Sun, Aug 23
LATAM Airlines Logo
6:00 am - 7:40 am
STL
-
AEP
22h 40m
2 stops
LATAM Airlines Logo
8:05 pm - 11:39 pm
AEP
-
STL
30h 34m
2 stops
$1,237LATAM Airlines
Sat, Jan 2 - Sat, Jan 16
LATAM Airlines Logo
9:00 am - 7:40 am
STL
-
AEP
19h 40m
2 stops
LATAM Airlines Logo
8:05 pm - 11:39 pm
AEP
-
STL
30h 34m
2 stops
$1,252LATAM Airlines
Sat, Jan 9 - Sat, Jan 16
LATAM Airlines Logo
5:23 pm - 4:00 pm
STL
-
AEP
20h 37m
2 stops
LATAM Airlines Logo
5:35 pm - 11:46 am
AEP
-
STL
20h 11m
2 stops
$1,282LATAM Airlines
Sun, Aug 16 - Sun, Aug 23
LATAM Airlines Logo
5:23 pm - 4:00 pm
STL
-
AEP
20h 37m
2 stops
LATAM Airlines Logo
3:45 pm - 11:56 am
AEP
-
STL
22h 11m
2 stops
$1,288LATAM Airlines
Fri, Aug 21 - Fri, Aug 28
LATAM Airlines Logo
12:52 pm - 7:40 pm
STL
-
AEP
28h 48m
2 stops
LATAM Airlines Logo
11:45 am - 11:56 am
AEP
-
STL
26h 11m
2 stops
$1,313LATAM Airlines
Fri, Aug 14 - Fri, Aug 21
Delta Logo
9:00 am - 7:40 am
STL
-
AEP
19h 40m
2 stops
Delta Logo
5:35 pm - 10:48 am
AEP
-
STL
20h 13m
2 stops
$1,388Delta
Fri, Jan 8 - Fri, Jan 15

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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 6
STL3:40 pmLambert-St Louis
25h 00m
2 stops
AEP7:40 pmBuenos Aires Jorge Newbery
Jan 19
AEP8:05 pmBuenos Aires Jorge Newbery
24h 01m
2 stops
STL5:06 pmLambert-St Louis
$1,148
LATAM Airlines
Dec 2
STL4:40 pmLambert-St Louis
20h 20m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Dec 17
AEP8:40 amBuenos Aires Jorge Newbery
29h 08m
2 stops
STL10:48 amLambert-St Louis
$1,172
LATAM Airlines
Aug 19
STL5:23 pmLambert-St Louis
20h 37m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Aug 23
AEP5:35 pmBuenos Aires Jorge Newbery
20h 11m
2 stops
STL11:46 amLambert-St Louis
$1,228

Delta flights from St. Louis to Buenos Aires Jorge Newbery Airport

Our best Delta deals on St. Louis to Buenos Aires Jorge Newbery Airport flight tickets
Delta
Nov 7
STL6:00 amLambert-St Louis
22h 40m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Nov 19
AEP5:35 pmBuenos Aires Jorge Newbery
20h 13m
2 stops
STL10:48 amLambert-St Louis
$1,188
Delta
Jan 8
STL9:00 amLambert-St Louis
19h 40m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Jan 15
AEP5:35 pmBuenos Aires Jorge Newbery
20h 13m
2 stops
STL10:48 amLambert-St Louis
$1,388
Delta
Jan 10
STL9:00 amLambert-St Louis
19h 40m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Jan 17
AEP3:50 pmBuenos Aires Jorge Newbery
19h 22m
2 stops
STL8:12 amLambert-St Louis
$2,043

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 July 21, 2026.
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

Cheapest round-trip

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 1/6

3:40 pm-7:40 pm

2 stops25h 00m

Buenos Aires Jorge Newbery

Tue 1/19

8:05 pm-5:06 pm

2 stops24h 01m

$1,148

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 12/2

4:40 pm-4:00 pm

2 stops20h 20m

Buenos Aires Jorge Newbery

Thu 12/17

8:40 am-10:48 am

2 stops29h 08m

$1,172

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 11/7

6:00 am-7:40 am

2 stops22h 40m

Buenos Aires Jorge Newbery

Thu 11/19

5:35 pm-10:48 am

2 stops20h 13m

$1,188

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 8/19

5:23 pm-4:00 pm

2 stops20h 37m

Buenos Aires Jorge Newbery

Sun 8/23

5:35 pm-11:46 am

2 stops20h 11m

$1,228

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/2

6:00 am-7:40 am

2 stops22h 40m

Buenos Aires Jorge Newbery

Sat 1/16

8:05 pm-11:39 pm

2 stops30h 34m

$1,237

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/9

9:00 am-7:40 am

2 stops19h 40m

Buenos Aires Jorge Newbery

Sat 1/16

8:05 pm-11:39 pm

2 stops30h 34m

$1,252

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 8/16

5:23 pm-4:00 pm

2 stops20h 37m

Buenos Aires Jorge Newbery

Sun 8/23

5:35 pm-11:46 am

2 stops20h 11m

$1,282

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 8/21

5:23 pm-4:00 pm

2 stops20h 37m

Buenos Aires Jorge Newbery

Fri 8/28

3:45 pm-11:56 am

2 stops22h 11m

$1,288

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 8/14

12:52 pm-7:40 pm

2 stops28h 48m

Buenos Aires Jorge Newbery

Fri 8/21

11:45 am-11:56 am

2 stops26h 11m

$1,313
Quickest round-trip

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 1/8

9:00 am-7:40 am

2 stops19h 40m

Buenos Aires Jorge Newbery

Fri 1/15

5:35 pm-10:48 am

2 stops20h 13m

$1,388

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Buenos Aires from

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?

Avianca 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

Fastest flight time

18h 40m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires Jorge Newbery Airport takes 18h 40m
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

Frequently asked questions about flying from St. Louis to Buenos Aires Jorge Newbery Airport

  • 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 18h 40m.

  • 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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