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Cheap flights from St. Louis to Buenos Aires from $937

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 Buenos Aires departing on 3/3. 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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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
5:00 pm - 4:00 pm
STL
-
AEP
20h 00m
2 stops
LATAM Airlines Logo
3:45 pm - 11:09 am
AEP
-
STL
21h 24m
2 stops
$937LATAM Airlines
Tue, Mar 3 - Tue, Mar 10
LATAM Airlines Logo
5:21 pm - 6:04 pm
STL
-
EZE
22h 43m
2 stops
LATAM Airlines Logo
8:00 am - 11:58 pm
EZE
-
STL
17h 58m
2 stops
$937LATAM Airlines
Tue, Mar 10 - Tue, Mar 17
LATAM Airlines Logo
10:13 am - 10:15 am
STL
-
EZE
21h 02m
2 stops
LATAM Airlines Logo
8:00 am - 11:58 pm
EZE
-
STL
17h 58m
2 stops
$941LATAM Airlines
Tue, Mar 3 - Tue, Mar 10
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
10:13 am - 11:45 am
STL
-
AEP
22h 32m
3 stops
LATAM Airlines Logo
5:15 pm - 11:09 am
AEP
-
STL
19h 54m
2 stops
$1,059LATAM Airlines
Tue, Mar 3 - Tue, Mar 10
LATAM Airlines Logo
7:03 am - 7:20 am
STL
-
EZE
22h 17m
1 stop
LATAM Airlines Logo
8:55 pm - 11:09 am
EZE
-
STL
16h 14m
1 stop
$1,063LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
4:21 pm - 4:00 pm
STL
-
AEP
21h 39m
2 stops
LATAM Airlines Logo
3:40 pm - 11:09 am
AEP
-
STL
21h 29m
2 stops
$1,067LATAM Airlines
Thu, Mar 19 - Thu, Mar 26
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
$1,089United Airlines
Sun, Mar 8 - Tue, Mar 17
Delta Logo
12:04 pm - 9:00 am
STL
-
EZE
18h 56m
1 stop
Delta Logo
8:55 pm - 4:16 pm
EZE
-
STL
21h 21m
1 stop
$1,107Delta
Sun, Mar 8 - Tue, Mar 17
American Airlines Logo
11:22 am - 9:59 am
STL
-
EZE
20h 37m
1 stop
American Airlines Logo
10:25 pm - 10:59 am
EZE
-
STL
14h 34m
1 stop
$1,202American Airlines
Fri, Mar 20 - Fri, Mar 27

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Mar 8
STL12:04 pmLambert-St Louis
18h 56m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 17
EZE8:55 pmBuenos Aires Ministro Pistarini
21h 21m
1 stop
STL4:16 pmLambert-St Louis
$1,107
Delta
Feb 12
STL10:13 amLambert-St Louis
19h 47m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 4
EZE8:55 pmBuenos Aires Ministro Pistarini
20h 52m
1 stop
STL2:47 pmLambert-St Louis
$1,601
Delta
Feb 12
STL10:13 amLambert-St Louis
19h 47m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 4
EZE8:55 pmBuenos Aires Ministro Pistarini
17h 07m
1 stop
STL11:02 amLambert-St Louis
$1,603

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets
LATAM Airlines
Mar 10
STL5:21 pmLambert-St Louis
13h 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
$937
LATAM Airlines
Mar 3
STL10:13 amLambert-St Louis
21h 02m
2 stops
EZE10:15 amBuenos Aires Ministro Pistarini
Mar 10
EZE8:00 amBuenos Aires Ministro Pistarini
17h 58m
2 stops
STL11:58 pmLambert-St Louis
$941
LATAM Airlines
Mar 3
STL10:13 amLambert-St Louis
22h 32m
3 stops
AEP11:45 amBuenos Aires Jorge Newbery
Mar 10
AEP5:15 pmBuenos Aires Jorge Newbery
19h 54m
2 stops
STL11:09 amLambert-St Louis
$1,059

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 February 4, 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 3/3

5:00 pm-4:00 pm

2 stops20h 00m

Buenos Aires Jorge Newbery

Tue 3/10

3:45 pm-11:09 am

2 stops21h 24m

$937

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/10

5:21 pm-6:04 pm

2 stops22h 43m

Buenos Aires Ministro Pistarini

Tue 3/17

8:00 am-11:58 pm

2 stops17h 58m

$937

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/3

10:13 am-10:15 am

2 stops21h 02m

Buenos Aires Ministro Pistarini

Tue 3/10

8:00 am-11:58 pm

2 stops17h 58m

$941

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 - AEP

STLAEP

Lambert-St Louis

Tue 3/3

10:13 am-11:45 am

3 stops22h 32m

Buenos Aires Jorge Newbery

Tue 3/10

5:15 pm-11:09 am

2 stops19h 54m

$1,059

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:03 am-7:20 am

1 stop22h 17m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-11:09 am

1 stop16h 14m

$1,063

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 3/19

4:21 pm-4:00 pm

2 stops21h 39m

Buenos Aires Jorge Newbery

Thu 3/26

3:40 pm-11:09 am

2 stops21h 29m

$1,067

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

$1,089

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

12:04 pm-9:00 am

1 stop18h 56m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-4:16 pm

1 stop21h 21m

$1,107

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 3/20

11:22 am-9:59 am

1 stop20h 37m

Buenos Aires Ministro Pistarini

Fri 3/27

10:25 pm-10:59 am

1 stop14h 34m

$1,202

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

12h 40m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 40m
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 12h 40m 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
8,146 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