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Cheap flights from St. Louis to Buenos Aires from $418

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 3/2. 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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Find the cheapest flights from St. Louis to Buenos Aires

Cheap round-trip flights

Enter your travel dates to find the best prices.
LATAM Airlines Logo
6:59 pm - 4:00 pm
STL
-
AEP
19h 01m
2 stops
LATAM Airlines Logo
5:15 pm - 11:09 am
AEP
-
STL
19h 54m
2 stops
$937LATAM Airlines
Tue, Mar 10 - Tue, Mar 17
LATAM Airlines Logo
3:47 pm - 9:00 am
STL
-
EZE
14h 13m
1 stop
LATAM Airlines Logo
8:55 pm - 9:05 am
EZE
-
STL
14h 10m
1 stop
$937LATAM Airlines
Mon, Mar 2 - Tue, Mar 24
LATAM Airlines Logo
11:55 am - 10:15 am
STL
-
EZE
19h 20m
2 stops
LATAM Airlines Logo
4:05 am - 11:58 pm
EZE
-
STL
21h 53m
2 stops
$941LATAM Airlines
Mon, Mar 2 - Tue, Mar 24
LATAM Airlines Logo
6:00 am - 9:35 am
STL
-
EZE
25h 35m
2 stops
LATAM Airlines Logo
8:00 am - 9:05 am
EZE
-
STL
27h 05m
2 stops
$971LATAM Airlines
Thu, Mar 12 - Thu, Mar 19
LATAM Airlines Logo
7:03 am - 9:35 am
STL
-
EZE
24h 32m
2 stops
LATAM Airlines Logo
11:55 pm - 9:02 am
EZE
-
STL
35h 07m
1 stop
$974LATAM Airlines
Thu, Mar 12 - Thu, Mar 19
United Airlines Logo
7:41 am - 8:20 am
STL
-
EZE
46h 39m
2 stops
United Airlines Logo
9:05 pm - 9:21 am
EZE
-
STL
14h 16m
1 stop
$1,008United Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
6:59 pm - 9:45 am
STL
-
EZE
12h 46m
1 stop
LATAM Airlines Logo
7:35 am - 11:34 pm
EZE
-
STL
17h 59m
2 stops
$1,047LATAM Airlines
Wed, Apr 1 - Thu, Apr 30
LATAM Airlines Logo
10:12 am - 8:35 am
STL
-
EZE
20h 23m
2 stops
LATAM Airlines Logo
3:55 am - 11:34 pm
EZE
-
STL
21h 39m
2 stops
$1,051LATAM Airlines
Wed, Apr 1 - Wed, Apr 29
American Airlines Logo
11:22 am - 7:15 am
STL
-
EZE
17h 53m
1 stop
American Airlines Logo
8:25 pm - 10:16 am
EZE
-
STL
15h 51m
1 stop
$1,087American Airlines
Wed, Apr 1 - Thu, Apr 30
Delta Logo
4:21 pm - 9:00 am
STL
-
EZE
14h 39m
1 stop
Delta Logo
8:55 pm - 9:05 am
EZE
-
STL
14h 10m
1 stop
$1,107Delta
Sun, Mar 8 - Tue, Mar 17

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires 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
14h 16m
1 stop
STL9:21 amLambert-St Louis
$1,008
United Airlines
Jun 3
STL8:50 amLambert-St Louis
21h 10m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Jun 11
EZE9:00 pmBuenos Aires Ministro Pistarini
24h 25m
2 stops
STL7:25 pmLambert-St Louis
$1,174
United Airlines
Mar 12
STL4:47 pmLambert-St Louis
35h 33m
1 stop
EZE6:20 amBuenos Aires Ministro Pistarini
Mar 19
EZE10:55 pmBuenos Aires Ministro Pistarini
19h 10m
1 stop
STL4:05 pmLambert-St Louis
$1,273

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Mar 8
STL4:21 pmLambert-St Louis
14h 39m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 17
EZE8:55 pmBuenos Aires Ministro Pistarini
14h 10m
1 stop
STL9:05 amLambert-St Louis
$1,107
Delta
Mar 11
STL10:12 amLambert-St Louis
20h 48m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 15
EZE8:55 pmBuenos Aires Ministro Pistarini
14h 10m
1 stop
STL9:05 amLambert-St Louis
$1,372

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Buenos Aires 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 January 27, 2026.
Use the filters below to find and compare flights from St. Louis to Buenos Aires 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

6:59 pm-4:00 pm

2 stops19h 01m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-11:09 am

2 stops19h 54m

$937

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/2

3:47 pm-9:00 am

1 stop14h 13m

Buenos Aires Ministro Pistarini

Tue 3/24

8:55 pm-9:05 am

1 stop14h 10m

$937

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/2

11:55 am-10:15 am

2 stops19h 20m

Buenos Aires Ministro Pistarini

Tue 3/24

4:05 am-11:58 pm

2 stops21h 53m

$941

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 3/12

6:00 am-9:35 am

2 stops25h 35m

Buenos Aires Ministro Pistarini

Thu 3/19

8:00 am-9:05 am

2 stops27h 05m

$971

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 3/12

7:03 am-9:35 am

2 stops24h 32m

Buenos Aires Ministro Pistarini

Thu 3/19

11:55 pm-9:02 am

1 stop35h 07m

$974

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

$1,008

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 4/1

6:59 pm-9:45 am

1 stop12h 46m

Buenos Aires Ministro Pistarini

Thu 4/30

7:35 am-11:34 pm

2 stops17h 59m

$1,047

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 4/1

10:12 am-8:35 am

2 stops20h 23m

Buenos Aires Ministro Pistarini

Wed 4/29

3:55 am-11:34 pm

2 stops21h 39m

$1,051

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 4/1

11:22 am-7:15 am

1 stop17h 53m

Buenos Aires Ministro Pistarini

Thu 4/30

8:25 pm-10:16 am

1 stop15h 51m

$1,087

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

4:21 pm-9:00 am

1 stop14h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-9:05 am

1 stop14h 10m

$1,107

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 Buenos Aires from

How to get the cheapest flight ticket from St. Louis to Buenos Aires

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 Buenos Aires?

The cheapest month to fly to Buenos Aires from St. Louis is in September. Flight prices, which tend to average around $1,056, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Buenos Aires from St. Louis during October instead. Flights to Buenos Aires in October, while not as cheap as those in September, still average around $1,160.

When to book flights from St. Louis to Buenos Aires

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Buenos Aires 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 (STL to BUE) flight deals and tips

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

Fastest flight time

13h 52m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 13h 52m
There are no direct flights from St. Louis to Buenos Aires. There are no popular flight routes from St. Louis to Buenos Aires.
Search flight deals

  • How far is Lambert-St Louis to Buenos Aires by plane?

    The straight-line distance from Lambert-St Louis to Buenos Aires is 5450.9 mi. Typically, this will take 13h 52m by plane in normal conditions.

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

    Prices for flights from Lambert-St Louis Airport to Buenos Aires are refreshed on a daily basis.

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

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

    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 Buenos Aires.

  • What documentation or ID do you need to fly to Buenos Aires?

    The travel and health documents required for your trip to Buenos Aires can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Buenos Aires. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Buenos Aires?

Best airlines flying from St. Louis to Buenos Aires

Compare and see reviews for airlines that fly from St. Louis to Buenos Aires with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,118 reviews
Search Delta flights

Why use momondo?

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

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 Buenos Aires from St. Louis.

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

Yes. All flights to Buenos Aires from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Buenos Aires from St. Louis.

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

Yes momondo offers price alerts on flights to Buenos Aires from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Find better results for your trip to Argentina

Fly into one of these airports located in Buenos Aires

Airports listed have a maximum distance of 17.0 mi from Buenos Aires
Buenos Aires Jorge Newbery Airport
Buenos Aires Ministro Pistarini Airport