AirHint found the following cheapest return flights from Chicago (ORD) to Buenos Aires (AEP) in December 2025 (see full year).

Return flights

13 Dec - 20 Dec	LATAM Airlines Group
13 Dec - 22 Dec	Avianca
27 Dec - 05 Jan	LATAM Airlines Group
28 Dec - 05 Jan	LATAM Airlines Group
21 Dec - 27 Dec	LATAM Airlines Group
17 Dec - 27 Dec	LATAM Airlines Group
25 Dec - 04 Jan	Avianca
24 Dec - 02 Jan	LATAM Airlines Group
27 Dec - 02 Jan	LATAM Airlines Group
25 Dec - 03 Jan	LATAM Airlines Group
27 Dec - 03 Jan	LATAM Airlines Group
20 Dec - 03 Jan	LATAM Airlines Group
19 Dec - 03 Jan	LATAM Airlines Group

Also check the deals for one-way flights from Chicago to Buenos Aires in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Buenos Aires

Cheap car rent in Buenos Aires

Cheapest return flights from Chicago to Buenos Aires in December from 1200€

Return flights