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Cheap flights from St. Louis to Argentina from $431

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 Argentina departing on 2/20. 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.
United Airlines Logo
4:35 pm - 9:20 amSTL-EZE
13h 45m1 stop
United Airlines Logo
10:05 pm - 9:22 amEZE-STL
14h 17m1 stop
$1,026United Airlines
Find Deal
Mon, Jan 19 - Mon, Jan 26
LATAM Airlines Logo
4:00 pm - 9:35 amSTL-EZE
15h 35m2 stops
LATAM Airlines Logo
8:00 am - 9:04 amEZE-STL
27h 04m2 stops
$1,048LATAM Airlines
Find Deal
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
7:05 pm - 5:00 pmSTL-AEP
19h 55m2 stops
LATAM Airlines Logo
5:15 pm - 11:50 amAEP-STL
20h 35m2 stops
$1,058LATAM Airlines
Find Deal
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
6:00 am - 7:20 amSTL-EZE
23h 20m1 stop
LATAM Airlines Logo
8:55 pm - 9:04 amEZE-STL
14h 09m1 stop
$1,058LATAM Airlines
Find Deal
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
5:00 pm - 6:40 pmSTL-AEP
22h 40m2 stops
LATAM Airlines Logo
3:40 pm - 11:04 amAEP-STL
22h 24m2 stops
$1,098LATAM Airlines
Find Deal
Sat, Jan 17 - Sun, Jan 25
LATAM Airlines Logo
12:00 pm - 10:15 amSTL-EZE
19h 15m2 stops
LATAM Airlines Logo
11:00 am - 11:37 pmEZE-STL
15h 37m2 stops
$1,102LATAM Airlines
Find Deal
Sat, Jan 17 - Sun, Jan 25
American Airlines Logo
10:00 am - 7:10 amSTL-EZE
18h 10m1 stop
American Airlines Logo
10:25 pm - 4:14 pmEZE-STL
20h 49m1 stop
$1,106American Airlines
Find Deal
Sat, Jan 17 - Sun, Jan 25
United Airlines Logo
6:40 pm - 7:20 amSTL-EZE
33h 40m2 stops
United Airlines Logo
10:05 pm - 9:22 amEZE-STL
14h 17m1 stop
$1,146United Airlines
Find Deal
Sun, Feb 1 - Sat, Feb 7
LATAM Airlines Logo
3:45 pm - 9:00 amSTL-EZE
14h 15m1 stop
LATAM Airlines Logo
8:55 pm - 11:54 amEZE-STL
17h 59m1 stop
$1,174LATAM Airlines
Find Deal
Sun, Feb 1 - Sat, Feb 7
Multiple Airlines Logo
2:47 pm - 4:35 amSTL-EZE
34h 48m3 stops
Multiple Airlines Logo
5:35 am - 10:56 amEZE-STL
32h 21m3 stops
$1,182Multiple Airlines
Find Deal
Thu, Dec 11 - Sat, Dec 20

United Airlines flights from St. Louis to Argentina

Our best United Airlines deals on St. Louis to Argentina flight tickets
United Airlines
Jan 19
STL4:35 pmLambert-St Louis
13h 45m
1 stop
EZE9:20 amBuenos Aires Ministro Pistarini
Jan 26
EZE10:05 pmBuenos Aires Ministro Pistarini
14h 17m
1 stop
STL9:22 amLambert-St Louis
$1,026
Find similar
United Airlines
Feb 1
STL6:40 pmLambert-St Louis
35h 40m
2 stops
EZE9:20 amBuenos Aires Ministro Pistarini
Feb 7
EZE11:55 pmBuenos Aires Ministro Pistarini
20h 48m
2 stops
STL5:43 pmLambert-St Louis
$1,146
Find similar
United Airlines
Dec 11
STL6:15 amLambert-St Louis
22h 05m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Dec 20
EZE10:05 pmBuenos Aires Ministro Pistarini
14h 44m
1 stop
STL9:49 amLambert-St Louis
$1,236
Find similar

LATAM Airlines flights from St. Louis to Argentina

Our best LATAM Airlines deals on St. Louis to Argentina flight tickets
LATAM Airlines
Mar 8
STL4:00 pmLambert-St Louis
15h 35m
2 stops
EZE9:35 amBuenos Aires Ministro Pistarini
Mar 17
EZE8:00 amBuenos Aires Ministro Pistarini
27h 04m
2 stops
STL9:04 amLambert-St Louis
$1,048
Find similar
LATAM Airlines
Mar 8
STL11:51 amLambert-St Louis
19h 09m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 17
EZE8:00 amBuenos Aires Ministro Pistarini
17h 40m
2 stops
STL11:40 pmLambert-St Louis
$1,058
Find similar
LATAM Airlines
Jan 17
STL12:00 pmLambert-St Louis
19h 15m
2 stops
EZE10:15 amBuenos Aires Ministro Pistarini
Jan 25
EZE11:00 amBuenos Aires Ministro Pistarini
15h 37m
2 stops
STL11:37 pmLambert-St Louis
$1,102
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Argentina 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 November 21, 2025.
Use the filters below to find and compare flights from St. Louis to Argentina that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 1/19

4:35 pm-9:20 am

1 stop13h 45m

Buenos Aires Ministro Pistarini

Mon 1/26

10:05 pm-9:22 am

1 stop14h 17m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

4:00 pm-9:35 am

2 stops15h 35m

Buenos Aires Ministro Pistarini

Tue 3/17

8:00 am-9:04 am

2 stops27h 04m

$1,048

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-11:50 am

2 stops20h 35m

$1,058

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

6:00 am-7:20 am

1 stop23h 20m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-9:04 am

1 stop14h 09m

$1,058

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 1/17

5:00 pm-6:40 pm

2 stops22h 40m

Buenos Aires Jorge Newbery

Sun 1/25

3:40 pm-11:04 am

2 stops22h 24m

$1,098

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 1/17

12:00 pm-10:15 am

2 stops19h 15m

Buenos Aires Ministro Pistarini

Sun 1/25

11:00 am-11:37 pm

2 stops15h 37m

$1,102

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 1/17

10:00 am-7:10 am

1 stop18h 10m

Buenos Aires Ministro Pistarini

Sun 1/25

10:25 pm-4:14 pm

1 stop20h 49m

$1,106

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 2/1

6:40 pm-7:20 am

2 stops33h 40m

Buenos Aires Ministro Pistarini

Sat 2/7

10:05 pm-9:22 am

1 stop14h 17m

$1,146

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 2/1

3:45 pm-9:00 am

1 stop14h 15m

Buenos Aires Ministro Pistarini

Sat 2/7

8:55 pm-11:54 am

1 stop17h 59m

$1,174

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 12/11

2:47 pm-4:35 am

3 stops34h 48m

Buenos Aires Ministro Pistarini

Sat 12/20

5:35 am-10:56 am

3 stops32h 21m

$1,182

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 Argentina from

How to get the cheapest flight ticket from St. Louis to Argentina

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 month to fly to Argentina?

If you are unable to visit Argentina during the month of September, then departing from St. Louis during the month October is also very affordable. Most momondo users find prices during this month for around $1,160.

What is the cheapest day to depart on your flight to Argentina?

The cheapest day to depart from St. Louis to Argentina is on a Tuesday. Travelers who choose to depart for Argentina on a Tuesday will often find tickets for as low as $1,163. The most expensive day to fly to Argentina is Friday, with ticket prices averaging around $1,386.

What is the cheapest time of day to depart on your flight to Argentina?

The cheapest time of day to fly to Argentina is in the evening when flights can be purchased for as low as $1,153. Flights in the morning are often more expensive with an average ticket price of $1,368.

Can stopping save me money on St. Louis to Argentina flights?

You could potentially save up to 46% on your flight if you consider stops on a St. Louis to Argentina flight.

Cheap St. Louis to Argentina flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Argentina

Direct flights

None
There are no direct flights from St. Louis to Argentina. There are no popular flight routes from St. Louis to Argentina.
Search flight deals

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Argentina?

    Prices for flights from Lambert-St Louis Airport to Argentina refresh daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Argentina?

  • How old do you have to be to fly from Lambert-St Louis Airport to Argentina?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Argentina.

  • What documentation or ID do you need to fly to Argentina?

    The required travel and health documents for your Argentina 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 Argentina. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from St. Louis to Argentina

Compare and see reviews for airlines that fly from St. Louis to Argentina with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $1,023Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,002 reviews
Search Delta flights
United AirlinesPriceFrom $1,081Free CancellationRating
7.4
9,029 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Argentina?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Argentina from St. Louis.

Can I find flights from St. Louis to Argentina with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Argentina flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Argentina?

Once you have performed a search for St. Louis to Argentina flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Argentina right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Argentina flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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