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Cheap flights from St. Louis to Buenos Aires from $361

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 6/10. 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.
Delta Logo
9:21 am - 7:40 am
STL
-
AEP
20h 19m
2 stops
Delta Logo
8:05 pm - 12:34 pm
AEP
-
STL
18h 29m
2 stops
$1,297Delta
Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
11:51 am - 7:40 am
STL
-
AEP
17h 49m
2 stops
LATAM Airlines Logo
8:05 pm - 12:53 pm
AEP
-
STL
18h 48m
2 stops
$1,335LATAM Airlines
Fri, Sep 18 - Fri, Sep 25
LATAM Airlines Logo
5:36 pm - 4:00 pm
STL
-
AEP
20h 24m
2 stops
LATAM Airlines Logo
3:45 pm - 9:43 am
AEP
-
STL
19h 58m
2 stops
$1,377LATAM Airlines
Sat, Jul 4 - Sat, Jul 11
LATAM Airlines Logo
5:23 pm - 4:00 pm
STL
-
AEP
20h 37m
2 stops
LATAM Airlines Logo
3:45 pm - 9:54 am
AEP
-
STL
20h 09m
2 stops
$1,393LATAM Airlines
Sat, Aug 22 - Wed, Aug 26
Multiple Airlines Logo
2:15 pm - 9:00 pm
STL
-
AEP
28h 45m
2 stops
Multiple Airlines Logo
1:40 pm - 8:25 pm
AEP
-
STL
32h 45m
3 stops
$1,435Multiple Airlines
Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
10:51 am - 7:40 am
STL
-
AEP
18h 49m
2 stops
LATAM Airlines Logo
8:05 pm - 5:53 pm
AEP
-
STL
23h 48m
2 stops
$1,452LATAM Airlines
Fri, Jun 26 - Thu, Jul 9
Multiple Airlines Logo
8:40 am - 5:20 pm
STL
-
AEP
30h 40m
3 stops
Multiple Airlines Logo
1:40 pm - 8:25 pm
AEP
-
STL
32h 45m
3 stops
$1,564Multiple Airlines
Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
6:00 am - 7:40 am
STL
-
AEP
23h 40m
2 stops
LATAM Airlines Logo
9:25 am - 12:34 pm
AEP
-
STL
29h 09m
2 stops
$1,567LATAM Airlines
Tue, Jun 16 - Thu, Jun 18
LATAM Airlines Logo
7:12 pm - 6:30 pm
STL
-
AEP
21h 18m
2 stops
LATAM Airlines Logo
9:25 am - 12:34 pm
AEP
-
STL
29h 09m
2 stops
$1,571LATAM Airlines
Tue, Jun 16 - Thu, Jun 18
LATAM Airlines Logo
11:51 am - 7:40 am
STL
-
AEP
17h 49m
2 stops
LATAM Airlines Logo
8:05 pm - 12:53 pm
AEP
-
STL
18h 48m
2 stops
$1,580LATAM Airlines
Fri, Sep 18 - Fri, Sep 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
Sep 18
STL11:51 amLambert-St Louis
17h 49m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Sep 25
AEP8:05 pmBuenos Aires Jorge Newbery
18h 48m
2 stops
STL12:53 pmLambert-St Louis
$1,335
LATAM Airlines
Jul 4
STL5:36 pmLambert-St Louis
20h 24m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Jul 11
AEP3:45 pmBuenos Aires Jorge Newbery
19h 58m
2 stops
STL9:43 amLambert-St Louis
$1,377
LATAM Airlines
Aug 22
STL5:23 pmLambert-St Louis
20h 37m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Aug 26
AEP3:45 pmBuenos Aires Jorge Newbery
20h 09m
2 stops
STL9:54 amLambert-St Louis
$1,393

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
Jun 17
STL9:21 amLambert-St Louis
20h 19m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Jun 24
AEP8:05 pmBuenos Aires Jorge Newbery
18h 29m
2 stops
STL12:34 pmLambert-St Louis
$1,297
Delta
Sep 18
STL9:00 amLambert-St Louis
20h 40m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Sep 25
AEP8:05 pmBuenos Aires Jorge Newbery
18h 48m
2 stops
STL12:53 pmLambert-St Louis
$1,588

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 May 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 6/17

9:21 am-7:40 am

2 stops20h 19m

Buenos Aires Jorge Newbery

Wed 6/24

8:05 pm-12:34 pm

2 stops18h 29m

$1,297
Quickest round-trip

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 9/18

11:51 am-7:40 am

2 stops17h 49m

Buenos Aires Jorge Newbery

Fri 9/25

8:05 pm-12:53 pm

2 stops18h 48m

$1,335

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 7/4

5:36 pm-4:00 pm

2 stops20h 24m

Buenos Aires Jorge Newbery

Sat 7/11

3:45 pm-9:43 am

2 stops19h 58m

$1,377

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 8/22

5:23 pm-4:00 pm

2 stops20h 37m

Buenos Aires Jorge Newbery

Wed 8/26

3:45 pm-9:54 am

2 stops20h 09m

$1,393

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 6/17

2:15 pm-9:00 pm

2 stops28h 45m

Buenos Aires Jorge Newbery

Wed 6/24

1:40 pm-8:25 pm

3 stops32h 45m

$1,435

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 6/26

10:51 am-7:40 am

2 stops18h 49m

Buenos Aires Jorge Newbery

Thu 7/9

8:05 pm-5:53 pm

2 stops23h 48m

$1,452

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 6/17

8:40 am-5:20 pm

3 stops30h 40m

Buenos Aires Jorge Newbery

Wed 6/24

1:40 pm-8:25 pm

3 stops32h 45m

$1,564

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 6/16

6:00 am-7:40 am

2 stops23h 40m

Buenos Aires Jorge Newbery

Thu 6/18

9:25 am-12:34 pm

2 stops29h 09m

$1,567

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 6/16

7:12 pm-6:30 pm

2 stops21h 18m

Buenos Aires Jorge Newbery

Thu 6/18

9:25 am-12:34 pm

2 stops29h 09m

$1,571

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 9/18

11:51 am-7:40 am

2 stops17h 49m

Buenos Aires Jorge Newbery

Fri 9/25

8:05 pm-12:53 pm

2 stops18h 48m

$1,580

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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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 40m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires Jorge Newbery Airport takes 20h 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 20h 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.

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

  • 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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