Earn point on your loyalty program!arrow arc left

Cheap flights from St Louis (STL) to Buenos Aires (AEP)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from St Louis (STL) to Buenos Aires (AEP)

How to find the cheapest flight from St Louis (STL) to Buenos Aires (AEP)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Buenos Aires (AEP)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Buenos Aires (AEP)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from St Louis to Buenos Aires in August , September 2026

28 Aug - 25 Sep $ 1,138.00
STL
St Louis
Frontier Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Frontier Airlines
3 STOPS
STL
St Louis
Pick dates
28 Aug - 11 Sep $ 1,143.00
STL
St Louis
Frontier Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Frontier Airlines
3 STOPS
STL
St Louis
Pick dates
28 Aug - 30 Sep $ 1,145.00
STL
St Louis
Frontier Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Frontier Airlines
3 STOPS
STL
St Louis
Pick dates

Last minute flights from St Louis to Buenos Aires

28 Aug - 01 Sep $ 1,503.00
STL
St Louis
Frontier Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Frontier Airlines
3 STOPS
STL
St Louis
Pick dates
28 Aug - 01 Sep $ 1,620.00
STL
St Louis
LATAM Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
LATAM Airlines
3 STOPS
STL
St Louis
Pick dates
28 Aug - 01 Sep $ 1,673.00
STL
St Louis
LATAM Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
LATAM Airlines
3 STOPS
STL
St Louis
Pick dates

One-way flights to Buenos Aires from St Louis

7:58 PM - 2:00 AM
Sky Airline
3 Stops
34h 32m
STL - AEP
$ 536
Kiwi
Pick dates
7:58 PM - 6:20 AM
LATAM Airlines
3 Stops
35h 27m
STL - AEP
$ 561
Kiwi
Pick dates
4:23 PM - 10:20 AM
Aerolineas Argentinas
2 Stops
18h 57m
STL - AEP
$ 660
Kiwi
Pick dates

How to find the cheapest flight from St Louis (STL) to Buenos Aires (AEP)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Buenos Aires (AEP)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Buenos Aires (AEP)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.