Cheapest return flights from Chicago to Buenos Aires in September from 684€

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

Return flights

05 Sep - 10 Sep Spirit Airlines
13 Sep - 18 Sep Spirit Airlines
17 Sep - 08 Oct Spirit Airlines
19 Sep - 21 Sep Spirit Airlines
30 Sep - 07 Oct Spirit Airlines
05 Sep - 18 Sep Copa
22 Sep - 03 Oct Frontier Airlines
29 Sep - 06 Oct LATAM Airlines Group

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

Skyscanner

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.

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