Latest deals
When to book
FAQs
Price Alerts

Cheap flights from St. Louis to Buenos Aires from $938

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 9/4. 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
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Buenos Aires (STL-AEP)

Cheap round-trip flights

LATAM Airlines Logo
9:21 am - 7:55 amSTL-AEP
19h 34m2 stops
LATAM Airlines Logo
5:15 pm - 6:35 pmAEP-STL
28h 20m2 stops
$1,025LATAM Airlines
Find Deal
mar., nov. 18 - mié., nov. 26
LATAM Airlines Logo
6:00 am - 7:55 amSTL-AEP
22h 55m2 stops
LATAM Airlines Logo
8:25 pm - 9:58 pmAEP-STL
28h 33m2 stops
$1,055LATAM Airlines
Find Deal
lun., nov. 10 - lun., nov. 17
LATAM Airlines Logo
1:40 pm - 4:05 pmSTL-AEP
24h 25m2 stops
LATAM Airlines Logo
10:35 am - 12:35 pmAEP-STL
28h 00m2 stops
$1,065LATAM Airlines
Find Deal
mié., oct. 22 - vie., oct. 31
LATAM Airlines Logo
5:12 pm - 7:55 amSTL-AEP
35h 43m2 stops
LATAM Airlines Logo
12:40 pm - 8:16 amAEP-STL
22h 36m2 stops
$1,140LATAM Airlines
Find Deal
dom., nov. 9 - jue., nov. 13
LATAM Airlines Logo
5:15 pm - 4:05 pmSTL-AEP
20h 50m2 stops
LATAM Airlines Logo
5:00 pm - 10:26 amAEP-STL
19h 26m2 stops
$1,175LATAM Airlines
Find Deal
mar., oct. 14 - mar., oct. 21
LATAM Airlines Logo
5:11 pm - 2:00 pmSTL-AEP
18h 49m2 stops
LATAM Airlines Logo
5:05 pm - 7:05 pmAEP-STL
28h 00m2 stops
$1,240LATAM Airlines
Find Deal
jue., sep. 4 - vie., sep. 12
LATAM Airlines Logo
5:11 pm - 2:00 pmSTL-AEP
18h 49m2 stops
LATAM Airlines Logo
5:05 pm - 12:21 pmAEP-STL
21h 16m2 stops
$1,336LATAM Airlines
Find Deal
jue., sep. 4 - vie., sep. 12
LATAM Airlines Logo
5:11 pm - 4:05 pmSTL-AEP
20h 54m2 stops
LATAM Airlines Logo
10:55 pm - 9:15 pmAEP-STL
24h 20m2 stops
$1,344LATAM Airlines
Find Deal
sáb., sep. 20 - sáb., oct. 4
Logo
4:05 pm - 5:40 amSTL-AEP
35h 35m3 stops
Logo
7:00 am - 3:18 pmAEP-STL
34h 18m3 stops
$1,448
Find Deal
mar., oct. 14 - mar., oct. 21
Delta Logo
5:12 pm - 12:20 pmSTL-AEP
16h 08m2 stops
Delta Logo
6:35 pm - 10:49 amAEP-STL
19h 14m2 stops
$7,240Delta
Find Deal
mar., nov. 11 - mar., nov. 18

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
Nov 18
STL9:21 amLambert-St Louis
19h 34m
2 stops
AEP7:55 amBuenos Aires Jorge Newbery
Nov 26
AEP5:15 pmBuenos Aires Jorge Newbery
28h 20m
2 stops
STL6:35 pmLambert-St Louis
$1,025
Find similar
LATAM Airlines
Nov 10
STL6:00 amLambert-St Louis
22h 55m
2 stops
AEP7:55 amBuenos Aires Jorge Newbery
Nov 17
AEP8:25 pmBuenos Aires Jorge Newbery
28h 33m
2 stops
STL9:58 pmLambert-St Louis
$1,055
Find similar
LATAM Airlines
Oct 22
STL1:40 pmLambert-St Louis
24h 25m
2 stops
AEP4:05 pmBuenos Aires Jorge Newbery
Oct 31
AEP10:35 amBuenos Aires Jorge Newbery
28h 00m
2 stops
STL12:35 pmLambert-St Louis
$1,065
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 septiembre 2, 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

mar. 11/18

9:21 am-7:55 am

2 stops19h 34m

Buenos Aires Jorge Newbery

mié. 11/26

5:15 pm-6:35 pm

2 stops28h 20m

$1,025

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

lun. 11/10

6:00 am-7:55 am

2 stops22h 55m

Buenos Aires Jorge Newbery

lun. 11/17

8:25 pm-9:58 pm

2 stops28h 33m

$1,055

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

mié. 10/22

1:40 pm-4:05 pm

2 stops24h 25m

Buenos Aires Jorge Newbery

vie. 10/31

10:35 am-12:35 pm

2 stops28h 00m

$1,065

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

dom. 11/9

5:12 pm-7:55 am

2 stops35h 43m

Buenos Aires Jorge Newbery

jue. 11/13

12:40 pm-8:16 am

2 stops22h 36m

$1,140

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

mar. 10/14

5:15 pm-4:05 pm

2 stops20h 50m

Buenos Aires Jorge Newbery

mar. 10/21

5:00 pm-10:26 am

2 stops19h 26m

$1,175

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

jue. 9/4

5:11 pm-2:00 pm

2 stops18h 49m

Buenos Aires Jorge Newbery

vie. 9/12

5:05 pm-7:05 pm

2 stops28h 00m

$1,240

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

jue. 9/4

5:11 pm-2:00 pm

2 stops18h 49m

Buenos Aires Jorge Newbery

vie. 9/12

5:05 pm-12:21 pm

2 stops21h 16m

$1,336

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

sáb. 9/20

5:11 pm-4:05 pm

2 stops20h 54m

Buenos Aires Jorge Newbery

sáb. 10/4

10:55 pm-9:15 pm

2 stops24h 20m

$1,344

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

mar. 10/14

4:05 pm-5:40 am

3 stops35h 35m

Buenos Aires Jorge Newbery

mar. 10/21

7:00 am-3:18 pm

3 stops34h 18m

$1,448

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

mar. 11/11

5:12 pm-12:20 pm

2 stops16h 08m

Buenos Aires Jorge Newbery

mar. 11/18

6:35 pm-10:49 am

2 stops19h 14m

$7,240

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 resultsSorted by cheapest first
1
2

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.
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 16h 08m.

  • 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.

An easier way to manage your Buenos Aires Jorge Newbery Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
dom. 9/7
dom. 9/14
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Buenos Aires

Popular cities in Argentina

Popular flights according to clicks in the last 7 days on momondo
Flights to Buenos Aires Ministro Pistarini Airportfrom $510