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Cheap flights from St. Louis to Argentina from $414

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 3/29. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
LATAM Airlines Logo
5:00 pm - 9:45 am
STL
-
EZE
14h 45m1 stop
LATAM Airlines Logo
3:55 am - 11:42 pm
EZE
-
STL
21h 47m2 stops
$1,018LATAM Airlines
Tue, Mar 31 - Mon, Apr 6
LATAM Airlines Logo
1:00 pm - 8:35 am
STL
-
EZE
17h 35m2 stops
LATAM Airlines Logo
7:35 am - 11:42 pm
EZE
-
STL
18h 07m2 stops
$1,022LATAM Airlines
Tue, Mar 31 - Tue, Apr 7
LATAM Airlines Logo
3:58 pm - 9:35 am
STL
-
EZE
15h 37m2 stops
LATAM Airlines Logo
7:45 am - 11:42 pm
EZE
-
STL
17h 57m2 stops
$1,048LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
6:59 pm - 5:00 pm
STL
-
AEP
20h 01m2 stops
LATAM Airlines Logo
10:35 am - 11:45 am
AEP
-
STL
27h 10m2 stops
$1,058LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
10:02 am - 7:20 am
STL
-
EZE
19h 18m1 stop
LATAM Airlines Logo
8:55 pm - 11:45 am
EZE
-
STL
16h 50m1 stop
$1,058LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
1:30 pm - 8:35 am
STL
-
EZE
17h 05m2 stops
LATAM Airlines Logo
7:35 am - 11:38 pm
EZE
-
STL
18h 03m2 stops
$1,087LATAM Airlines
Fri, May 8 - Fri, May 15
LATAM Airlines Logo
3:58 pm - 11:22 am
STL
-
EZE
17h 24m2 stops
LATAM Airlines Logo
8:10 pm - 8:52 am
EZE
-
STL
14h 42m1 stop
$1,094LATAM Airlines
Thu, Apr 2 - Mon, Apr 6
United Airlines Logo
10:07 am - 7:20 am
STL
-
EZE
18h 13m1 stop
United Airlines Logo
11:55 pm - 3:52 pm
EZE
-
STL
18h 57m1 stop
$1,101United Airlines
Thu, Jan 8 - Mon, Jan 26
Delta Logo
5:00 pm - 9:45 am
STL
-
EZE
14h 45m1 stop
Delta Logo
8:10 pm - 8:52 am
EZE
-
STL
14h 42m1 stop
$1,102Delta
Wed, Apr 1 - Mon, Apr 6
United Airlines Logo
10:07 am - 7:20 am
STL
-
EZE
18h 13m1 stop
United Airlines Logo
10:05 pm - 5:43 pm
EZE
-
STL
22h 38m2 stops
$1,105United Airlines
Thu, Jan 8 - Mon, Jan 26

LATAM Airlines flights from St. Louis to Argentina

Our best LATAM Airlines deals on St. Louis to Argentina flight tickets
LATAM Airlines
Mar 31
STL5:00 pmLambert-St Louis
14h 45m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Apr 6
EZE3:55 amBuenos Aires Ministro Pistarini
21h 47m
2 stops
STL11:42 pmLambert-St Louis
$1,018
Find similar
LATAM Airlines
Mar 31
STL1:00 pmLambert-St Louis
17h 35m
2 stops
EZE8:35 amBuenos Aires Ministro Pistarini
Apr 7
EZE7:35 amBuenos Aires Ministro Pistarini
18h 07m
2 stops
STL11:42 pmLambert-St Louis
$1,022
Find similar
LATAM Airlines
Mar 8
STL3:58 pmLambert-St Louis
15h 37m
2 stops
EZE9:35 amBuenos Aires Ministro Pistarini
Mar 17
EZE7:45 amBuenos Aires Ministro Pistarini
17h 57m
2 stops
STL11:42 pmLambert-St Louis
$1,048
Find similar

United Airlines flights from St. Louis to Argentina

Our best United Airlines deals on St. Louis to Argentina flight tickets
United Airlines
Jan 8
STL6:00 amLambert-St Louis
24h 20m
1 stop
EZE9:20 amBuenos Aires Ministro Pistarini
Jan 26
EZE11:55 pmBuenos Aires Ministro Pistarini
18h 57m
1 stop
STL3:52 pmLambert-St Louis
$1,101
Find similar
United Airlines
Jan 8
STL9:57 amLambert-St Louis
18h 23m
2 stops
EZE7:20 amBuenos Aires Ministro Pistarini
Jan 26
EZE10:05 pmBuenos Aires Ministro Pistarini
22h 38m
2 stops
STL5:43 pmLambert-St Louis
$1,105
Find similar
United Airlines
Jan 17
STL4:42 pmLambert-St Louis
13h 38m
1 stop
EZE9:20 amBuenos Aires Ministro Pistarini
Jan 24
EZE10:05 pmBuenos Aires Ministro Pistarini
14h 17m
1 stop
STL9:22 amLambert-St Louis
$1,181
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 December 5, 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

Tue 3/31

5:00 pm-9:45 am

1 stop14h 45m

Buenos Aires Ministro Pistarini

Mon 4/6

3:55 am-11:42 pm

2 stops21h 47m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/31

1:00 pm-8:35 am

2 stops17h 35m

Buenos Aires Ministro Pistarini

Tue 4/7

7:35 am-11:42 pm

2 stops18h 07m

$1,022

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

3:58 pm-9:35 am

2 stops15h 37m

Buenos Aires Ministro Pistarini

Tue 3/17

7:45 am-11:42 pm

2 stops17h 57m

$1,048

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

6:59 pm-5:00 pm

2 stops20h 01m

Buenos Aires Jorge Newbery

Tue 3/17

10:35 am-11:45 am

2 stops27h 10m

$1,058

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

10:02 am-7:20 am

1 stop19h 18m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-11:45 am

1 stop16h 50m

$1,058

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 5/8

1:30 pm-8:35 am

2 stops17h 05m

Buenos Aires Ministro Pistarini

Fri 5/15

7:35 am-11:38 pm

2 stops18h 03m

$1,087

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 4/2

3:58 pm-11:22 am

2 stops17h 24m

Buenos Aires Ministro Pistarini

Mon 4/6

8:10 pm-8:52 am

1 stop14h 42m

$1,094

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 1/8

10:07 am-7:20 am

1 stop18h 13m

Buenos Aires Ministro Pistarini

Mon 1/26

11:55 pm-3:52 pm

1 stop18h 57m

$1,101

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 4/1

5:00 pm-9:45 am

1 stop14h 45m

Buenos Aires Ministro Pistarini

Mon 4/6

8:10 pm-8:52 am

1 stop14h 42m

$1,102

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 1/8

10:07 am-7:20 am

1 stop18h 13m

Buenos Aires Ministro Pistarini

Mon 1/26

10:05 pm-5:43 pm

2 stops22h 38m

$1,105

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

Fastest flight time

12h 40m

Direct flights

None
The fastest flight from St. Louis to Argentina takes 12h 40m
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
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,010 reviews
Search Delta flights
United AirlinesPriceFrom $1,081Free CancellationRating
7.4
9,064 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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