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Cheap flights from St. Louis to Buenos Aires from $477

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 6/6. 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

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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
5:19 pm - 9:30 pm
STL
-
AEP
26h 11m
2 stops
LATAM Airlines Logo
3:45 pm - 6:02 pm
AEP
-
STL
28h 17m
2 stops
$1,139LATAM Airlines
Mon, Aug 3 - Thu, Aug 13
LATAM Airlines Logo
7:05 pm - 5:00 pm
STL
-
AEP
19h 55m
2 stops
LATAM Airlines Logo
3:45 pm - 10:41 am
AEP
-
STL
20h 56m
2 stops
$1,147LATAM Airlines
Wed, Aug 12 - Thu, Aug 20
Delta Logo
5:19 pm - 4:00 pm
STL
-
AEP
20h 41m
2 stops
Delta Logo
3:45 pm - 4:55 pm
AEP
-
STL
27h 10m
2 stops
$1,187Delta
Tue, Aug 4 - Fri, Aug 14
LATAM Airlines Logo
10:51 am - 7:40 am
STL
-
AEP
18h 49m
2 stops
LATAM Airlines Logo
3:45 pm - 10:41 am
AEP
-
STL
20h 56m
2 stops
$1,289LATAM Airlines
Wed, Aug 5 - Wed, Aug 12
LATAM Airlines Logo
7:05 pm - 4:00 pm
STL
-
AEP
18h 55m
2 stops
LATAM Airlines Logo
5:35 pm - 10:41 am
AEP
-
STL
19h 06m
2 stops
$1,293LATAM Airlines
Thu, Aug 20 - Mon, Aug 24
LATAM Airlines Logo
10:49 am - 8:30 am
STL
-
AEP
19h 41m
2 stops
LATAM Airlines Logo
8:05 pm - 12:20 pm
AEP
-
STL
18h 15m
2 stops
$1,297LATAM Airlines
Wed, May 20 - Wed, May 27
Multiple Airlines Logo
7:05 am - 7:50 pm
STL
-
AEP
34h 45m
3 stops
Multiple Airlines Logo
10:35 am - 8:25 pm
AEP
-
STL
35h 50m
2 stops
$1,357Multiple Airlines
Tue, May 26 - Thu, Jun 4
LATAM Airlines Logo
10:49 am - 7:40 am
STL
-
AEP
18h 51m
2 stops
LATAM Airlines Logo
8:05 pm - 12:22 pm
AEP
-
STL
18h 17m
2 stops
$1,372LATAM Airlines
Mon, May 18 - Mon, May 25
Multiple Airlines Logo
7:05 am - 10:00 am
STL
-
AEP
48h 55m
2 stops
Multiple Airlines Logo
7:00 am - 12:06 pm
AEP
-
STL
31h 06m
3 stops
$1,404Multiple Airlines
Wed, May 20 - Wed, May 27
LATAM Airlines Logo
5:15 pm - 2:50 pm
STL
-
AEP
19h 35m
2 stops
LATAM Airlines Logo
5:35 pm - 6:00 pm
AEP
-
STL
26h 25m
2 stops
$1,464LATAM Airlines
Sat, May 16 - Sat, May 23

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
Aug 4
STL5:19 pmLambert-St Louis
20h 41m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Aug 14
AEP3:45 pmBuenos Aires Jorge Newbery
27h 10m
2 stops
STL4:55 pmLambert-St Louis
$1,187
Delta
May 22
STL9:13 amLambert-St Louis
20h 27m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
May 30
AEP8:05 pmBuenos Aires Jorge Newbery
22h 05m
2 stops
STL4:10 pmLambert-St Louis
$1,527
Delta
Aug 2
STL4:12 pmLambert-St Louis
19h 48m
2 stops
AEP2:00 pmBuenos Aires Jorge Newbery
Aug 12
AEP8:05 pmBuenos Aires Jorge Newbery
21h 52m
2 stops
STL3:57 pmLambert-St Louis
$2,272

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
Aug 3
STL5:19 pmLambert-St Louis
26h 11m
2 stops
AEP9:30 pmBuenos Aires Jorge Newbery
Aug 13
AEP3:45 pmBuenos Aires Jorge Newbery
28h 17m
2 stops
STL6:02 pmLambert-St Louis
$1,139
LATAM Airlines
Aug 12
STL7:05 pmLambert-St Louis
19h 55m
2 stops
AEP5:00 pmBuenos Aires Jorge Newbery
Aug 20
AEP3:45 pmBuenos Aires Jorge Newbery
20h 56m
2 stops
STL10:41 amLambert-St Louis
$1,147
LATAM Airlines
Aug 5
STL10:51 amLambert-St Louis
18h 49m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Aug 12
AEP3:45 pmBuenos Aires Jorge Newbery
20h 56m
2 stops
STL10:41 amLambert-St Louis
$1,289

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 April 6, 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

Mon 8/3

5:19 pm-9:30 pm

2 stops26h 11m

Buenos Aires Jorge Newbery

Thu 8/13

3:45 pm-6:02 pm

2 stops28h 17m

$1,139

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 8/12

7:05 pm-5:00 pm

2 stops19h 55m

Buenos Aires Jorge Newbery

Thu 8/20

3:45 pm-10:41 am

2 stops20h 56m

$1,147

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 8/4

5:19 pm-4:00 pm

2 stops20h 41m

Buenos Aires Jorge Newbery

Fri 8/14

3:45 pm-4:55 pm

2 stops27h 10m

$1,187

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 8/5

10:51 am-7:40 am

2 stops18h 49m

Buenos Aires Jorge Newbery

Wed 8/12

3:45 pm-10:41 am

2 stops20h 56m

$1,289

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 8/20

7:05 pm-4:00 pm

2 stops18h 55m

Buenos Aires Jorge Newbery

Mon 8/24

5:35 pm-10:41 am

2 stops19h 06m

$1,293

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 5/20

10:49 am-8:30 am

2 stops19h 41m

Buenos Aires Jorge Newbery

Wed 5/27

8:05 pm-12:20 pm

2 stops18h 15m

$1,297

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 5/26

7:05 am-7:50 pm

3 stops34h 45m

Buenos Aires Jorge Newbery

Thu 6/4

10:35 am-8:25 pm

2 stops35h 50m

$1,357
Quickest round-trip

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Mon 5/18

10:49 am-7:40 am

2 stops18h 51m

Buenos Aires Jorge Newbery

Mon 5/25

8:05 pm-12:22 pm

2 stops18h 17m

$1,372

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 5/20

7:05 am-10:00 am

2 stops48h 55m

Buenos Aires Jorge Newbery

Wed 5/27

7:00 am-12:06 pm

3 stops31h 06m

$1,404

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 5/16

5:15 pm-2:50 pm

2 stops19h 35m

Buenos Aires Jorge Newbery

Sat 5/23

5:35 pm-6:00 pm

2 stops26h 25m

$1,464

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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

17h 36m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires Jorge Newbery Airport takes 17h 36m
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 17h 36m.

  • 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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