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Cheap flights from St. Louis to Argentina from $1,018

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Argentina departing on 2/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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LATAM Airlines Logo
9:59 am - 9:40 amSTL-AEP
20h 41m2 stops
LATAM Airlines Logo
3:40 pm - 9:06 amAEP-STL
20h 26m2 stops
$1,018LATAM Airlines
Find Deal
Wed, Feb 4 - Wed, Feb 18
LATAM Airlines Logo
3:45 pm - 9:00 amSTL-EZE
14h 15m1 stop
LATAM Airlines Logo
8:00 am - 11:36 pmEZE-STL
18h 36m2 stops
$1,018LATAM Airlines
Find Deal
Mon, Feb 9 - Thu, Mar 5
LATAM Airlines Logo
11:55 am - 9:35 amSTL-EZE
18h 40m2 stops
LATAM Airlines Logo
8:55 pm - 11:02 amEZE-STL
17h 07m1 stop
$1,022LATAM Airlines
Find Deal
Thu, Feb 12 - Tue, Mar 3
American Airlines Logo
11:55 am - 8:25 amSTL-EZE
17h 30m1 stop
American Airlines Logo
10:25 pm - 10:59 amEZE-STL
15h 34m1 stop
$1,026American Airlines
Find Deal
Wed, Feb 4 - Wed, Feb 18
United Airlines Logo
9:57 am - 7:20 amSTL-EZE
18h 23m2 stops
United Airlines Logo
10:05 pm - 4:02 pmEZE-STL
20h 57m2 stops
$1,030United Airlines
Find Deal
Mon, Feb 9 - Mon, Mar 2
United Airlines Logo
4:35 pm - 7:20 amSTL-EZE
35h 45m1 stop
United Airlines Logo
11:55 pm - 3:38 pmEZE-STL
18h 43m1 stop
$1,035United Airlines
Find Deal
Sun, Feb 8 - Mon, Mar 2
United Airlines Logo
4:35 pm - 7:20 amSTL-EZE
35h 45m1 stop
United Airlines Logo
10:05 pm - 12:25 pmEZE-STL
17h 20m2 stops
$1,039United Airlines
Find Deal
Sun, Feb 8 - Mon, Mar 2
LATAM Airlines Logo
3:58 pm - 9:35 amSTL-EZE
15h 37m2 stops
LATAM Airlines Logo
7:45 am - 11:42 pmEZE-STL
17h 57m2 stops
$1,048LATAM Airlines
Find Deal
Sun, Mar 8 - Tue, Mar 17
Multiple Airlines Logo
10:42 am - 9:35 amSTL-EZE
43h 53m2 stops
Multiple Airlines Logo
11:25 pm - 1:50 pmEZE-STL
17h 25m1 stop
$1,064Multiple Airlines
Find Deal
Sun, Dec 7 - Tue, Dec 16
Delta Logo
9:59 am - 9:00 amSTL-EZE
20h 01m1 stop
Delta Logo
8:00 am - 9:06 amEZE-STL
28h 06m2 stops
$1,066Delta
Find Deal
Wed, Feb 11 - Fri, Mar 6

Delta flights from St. Louis to Argentina

Our best Delta deals on St. Louis to Argentina flight tickets
Delta
Feb 9
STL6:00 amLambert-St Louis
25h 15m
2 stops
EZE10:15 amBuenos Aires Ministro Pistarini
Mar 4
EZE10:25 pmBuenos Aires Ministro Pistarini
21h 17m
2 stops
STL4:42 pmLambert-St Louis
$1,030
Find similar
Delta
Feb 11
STL9:59 amLambert-St Louis
20h 01m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 6
EZE8:00 amBuenos Aires Ministro Pistarini
28h 06m
2 stops
STL9:06 amLambert-St Louis
$1,066
Find similar
Delta
Feb 12
STL6:47 pmLambert-St Louis
33h 33m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Mar 8
EZE8:55 pmBuenos Aires Ministro Pistarini
20h 03m
1 stop
STL2:58 pmLambert-St Louis
$1,114
Find similar

United Airlines flights from St. Louis to Argentina

Our best United Airlines deals on St. Louis to Argentina flight tickets
United Airlines
Feb 8
STL4:35 pmLambert-St Louis
35h 45m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Mar 2
EZE11:55 pmBuenos Aires Ministro Pistarini
18h 43m
1 stop
STL3:38 pmLambert-St Louis
$1,035
Find similar
United Airlines
Feb 8
STL4:35 pmLambert-St Louis
35h 45m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Mar 2
EZE10:05 pmBuenos Aires Ministro Pistarini
17h 20m
2 stops
STL12:25 pmLambert-St Louis
$1,039
Find similar
United Airlines
Feb 7
STL4:42 pmLambert-St Louis
13h 38m
1 stop
EZE9:20 amBuenos Aires Ministro Pistarini
Mar 5
EZE10:05 pmBuenos Aires Ministro Pistarini
22h 39m
2 stops
STL5:44 pmLambert-St Louis
$1,070
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 26, 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

Wed 2/4

9:59 am-9:40 am

2 stops20h 41m

Buenos Aires Jorge Newbery

Wed 2/18

3:40 pm-9:06 am

2 stops20h 26m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 2/9

3:45 pm-9:00 am

1 stop14h 15m

Buenos Aires Ministro Pistarini

Thu 3/5

8:00 am-11:36 pm

2 stops18h 36m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 2/12

11:55 am-9:35 am

2 stops18h 40m

Buenos Aires Ministro Pistarini

Tue 3/3

8:55 pm-11:02 am

1 stop17h 07m

$1,022

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 2/4

11:55 am-8:25 am

1 stop17h 30m

Buenos Aires Ministro Pistarini

Wed 2/18

10:25 pm-10:59 am

1 stop15h 34m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 2/9

9:57 am-7:20 am

2 stops18h 23m

Buenos Aires Ministro Pistarini

Mon 3/2

10:05 pm-4:02 pm

2 stops20h 57m

$1,030

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 2/8

4:35 pm-7:20 am

1 stop35h 45m

Buenos Aires Ministro Pistarini

Mon 3/2

11:55 pm-3:38 pm

1 stop18h 43m

$1,035

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 2/8

4:35 pm-7:20 am

1 stop35h 45m

Buenos Aires Ministro Pistarini

Mon 3/2

10:05 pm-12:25 pm

2 stops17h 20m

$1,039

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 - EZE

STLEZE

Lambert-St Louis

Sun 12/7

10:42 am-9:35 am

2 stops43h 53m

Buenos Aires Ministro Pistarini

Tue 12/16

11:25 pm-1:50 pm

1 stop17h 25m

$1,064

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 2/11

9:59 am-9:00 am

1 stop20h 01m

Buenos Aires Ministro Pistarini

Fri 3/6

8:00 am-9:06 am

2 stops28h 06m

$1,066

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

13h 41m

Direct flights

None
The fastest flight from St. Louis to Argentina takes 13h 41m
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
11,038 reviews
Search American Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
7,998 reviews
Search Delta flights
United AirlinesPriceFrom $1,081Free CancellationRating
7.4
9,046 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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