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 May , June 2026

28 May - 09 Jun $ 1,312.00
STL
St Louis
Frontier Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Frontier Airlines
3 STOPS
STL
St Louis
Pick dates
29 May - 08 Jun $ 2,122.00
STL
St Louis
LATAM Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
LATAM Airlines
2 STOPS
STL
St Louis
Pick dates
29 May - 08 Jun $ 2,128.00
STL
St Louis
LATAM Airlines
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
LATAM Airlines
2 STOPS
STL
St Louis
Pick dates

Last minute flights from St Louis to Buenos Aires

28 May - 01 Jun $ 1,444.00
STL
St Louis
Volaris
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Volaris
2 STOPS
STL
St Louis
Pick dates
27 May - 01 Jun $ 1,460.00
STL
St Louis
Volaris
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Volaris
2 STOPS
STL
St Louis
Pick dates
26 May - 01 Jun $ 1,527.00
STL
St Louis
Volaris
2 STOPS
AEP
Buenos Aires
AEP
Buenos Aires
Volaris
2 STOPS
STL
St Louis
Pick dates

One-way flights to Buenos Aires from St Louis

6:00 AM - 9:15 PM
Avianca
2 Stops
21h 40m
STL - AEP
$ 685
Kiwi
Pick dates
1:27 PM - 11:00 AM
LATAM Airlines
2 Stops
22h 33m
STL - AEP
$ 948
Kiwi
Pick dates
1:27 PM - 6:35 AM
LATAM Airlines
2 Stops
18h 13m
STL - AEP
$ 954
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.