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Cheap flights from St. Louis to Argentina from $381

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 3/8. 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.
LATAM Airlines Logo
5:00 pm - 4:00 pm
STL
-
AEP
21h 00m2 stops
LATAM Airlines Logo
3:40 pm - 8:52 am
AEP
-
STL
19h 12m2 stops
$936LATAM Airlines
Tue, Mar 10 - Wed, Mar 25
LATAM Airlines Logo
5:00 pm - 9:00 am
STL
-
EZE
14h 00m1 stop
LATAM Airlines Logo
8:55 pm - 8:52 am
EZE
-
STL
13h 57m1 stop
$936LATAM Airlines
Tue, Mar 10 - Wed, Mar 25
LATAM Airlines Logo
5:00 pm - 9:35 am
STL
-
EZE
14h 35m2 stops
LATAM Airlines Logo
4:05 am - 11:42 pm
EZE
-
STL
21h 37m2 stops
$940LATAM Airlines
Tue, Mar 10 - Wed, Mar 25
United Airlines Logo
7:41 am - 8:20 am
STL
-
EZE
46h 39m2 stops
United Airlines Logo
9:05 pm - 9:07 pm
EZE
-
STL
26h 02m2 stops
$956United Airlines
Sun, Mar 8 - Tue, Mar 17
United Airlines Logo
7:41 am - 8:20 am
STL
-
EZE
46h 39m2 stops
United Airlines Logo
9:05 pm - 9:21 am
EZE
-
STL
14h 16m1 stop
$1,001United Airlines
Sun, Mar 8 - Tue, Mar 17
United Airlines Logo
7:41 am - 8:20 am
STL
-
EZE
46h 39m2 stops
United Airlines Logo
9:05 pm - 9:21 am
EZE
-
STL
14h 16m1 stop
$1,002United Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
3:58 pm - 5:00 pm
STL
-
AEP
23h 02m2 stops
LATAM Airlines Logo
11:30 am - 8:52 am
AEP
-
STL
23h 22m2 stops
$1,013LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
10:02 am - 9:00 am
STL
-
EZE
20h 58m1 stop
LATAM Airlines Logo
8:55 pm - 8:52 am
EZE
-
STL
13h 57m1 stop
$1,013LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
11:51 am - 7:40 am
STL
-
AEP
17h 49m2 stops
LATAM Airlines Logo
5:05 pm - 10:45 am
AEP
-
STL
19h 40m2 stops
$1,018LATAM Airlines
Wed, May 27 - Mon, Jun 8
LATAM Airlines Logo
1:30 pm - 9:45 am
STL
-
EZE
18h 15m1 stop
LATAM Airlines Logo
7:35 am - 7:12 pm
EZE
-
STL
37h 37m3 stops
$1,021LATAM Airlines
Wed, May 27 - Mon, Jun 8

United Airlines flights from St. Louis to Argentina

Our best United Airlines deals on St. Louis to Argentina flight tickets
United Airlines
Mar 8
STL7:41 amLambert-St Louis
46h 39m
2 stops
EZE8:20 amBuenos Aires Ministro Pistarini
Mar 17
EZE9:05 pmBuenos Aires Ministro Pistarini
26h 02m
2 stops
STL9:07 pmLambert-St Louis
$956
Find similar
United Airlines
Mar 8
STL7:41 amLambert-St Louis
46h 39m
2 stops
EZE8:20 amBuenos Aires Ministro Pistarini
Mar 17
EZE9:05 pmBuenos Aires Ministro Pistarini
14h 16m
1 stop
STL9:21 amLambert-St Louis
$1,001
Find similar
United Airlines
Mar 8
STL7:41 amLambert-St Louis
46h 39m
2 stops
EZE8:20 amBuenos Aires Ministro Pistarini
Mar 17
EZE9:05 pmBuenos Aires Ministro Pistarini
14h 16m
1 stop
STL9:21 amLambert-St Louis
$1,002
Find similar

Air Canada flights from St. Louis to Argentina

Our best Air Canada deals on St. Louis to Argentina flight tickets
Air Canada
May 26
STL7:30 amLambert-St Louis
29h 00m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Jun 6
EZE4:35 pmBuenos Aires Ministro Pistarini
29h 30m
2 stops
STL8:05 pmLambert-St Louis
$1,229
Find similar
Air Canada
Dec 18
STL4:05 pmLambert-St Louis
22h 15m
2 stops
EZE5:20 pmBuenos Aires Ministro Pistarini
Dec 20
EZE4:45 pmBuenos Aires Ministro Pistarini
29h 33m
3 stops
STL7:18 pmLambert-St Louis
$3,535
Find similar
Air Canada
Dec 19
STL6:30 amLambert-St Louis
29h 40m
3 stops
EZE3:10 pmBuenos Aires Ministro Pistarini
Dec 21
EZE4:45 pmBuenos Aires Ministro Pistarini
25h 44m
2 stops
STL3:29 pmLambert-St Louis
$4,274
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 16, 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 - AEP

STLAEP

Lambert-St Louis

Tue 3/10

5:00 pm-4:00 pm

2 stops21h 00m

Buenos Aires Jorge Newbery

Wed 3/25

3:40 pm-8:52 am

2 stops19h 12m

$936

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/10

5:00 pm-9:00 am

1 stop14h 00m

Buenos Aires Ministro Pistarini

Wed 3/25

8:55 pm-8:52 am

1 stop13h 57m

$936

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/10

5:00 pm-9:35 am

2 stops14h 35m

Buenos Aires Ministro Pistarini

Wed 3/25

4:05 am-11:42 pm

2 stops21h 37m

$940

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:41 am-8:20 am

2 stops46h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-9:07 pm

2 stops26h 02m

$956

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:41 am-8:20 am

2 stops46h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-9:21 am

1 stop14h 16m

$1,001

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:41 am-8:20 am

2 stops46h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-9:21 am

1 stop14h 16m

$1,002

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

3:58 pm-5:00 pm

2 stops23h 02m

Buenos Aires Jorge Newbery

Tue 3/17

11:30 am-8:52 am

2 stops23h 22m

$1,013

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

10:02 am-9:00 am

1 stop20h 58m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-8:52 am

1 stop13h 57m

$1,013

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 5/27

11:51 am-7:40 am

2 stops17h 49m

Buenos Aires Jorge Newbery

Mon 6/8

5:05 pm-10:45 am

2 stops19h 40m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 5/27

1:30 pm-9:45 am

1 stop18h 15m

Buenos Aires Ministro Pistarini

Mon 6/8

7:35 am-7:12 pm

3 stops37h 37m

$1,021

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

14h 13m

Direct flights

None
The fastest flight from St. Louis to Argentina takes 14h 13m
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
8,008 reviews
Search Delta 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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