Cheapest return flights from Chicago to Buenos Aires in December from $1010

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

Return flights

13 Dec - 10 Jan Frontier Airlines
04 Dec - 11 Dec Copa
11 Dec - 06 Jan Avianca
20 Dec - 27 Dec Spirit Airlines
20 Dec - 28 Dec Spirit Airlines
25 Dec - 02 Jan Avianca
25 Dec - 03 Jan Avianca
15 Dec - 31 Dec Avianca
19 Dec - 03 Jan Frontier Airlines
31 Dec - 05 Jan Avianca
11 Dec - 03 Jan Avianca
17 Dec - 05 Jan Avianca
18 Dec - 05 Jan Avianca
19 Dec - 05 Jan Avianca

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

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