AirHint found the following cheapest return flights from Chicago (MDW) to Lima (LIM) in September 2025 (see full year).

Return flights

26 Sep - 27 Sep	Delta
17 Sep - 22 Sep	LATAM Airlines Group
19 Sep - 27 Sep	LATAM Airlines Group
13 Sep - 16 Oct	LATAM Airlines Group
15 Sep - 15 Oct	LATAM Airlines Group
01 Sep - 05 Sep	LATAM Airlines Group
13 Sep - 30 Sep	LATAM Airlines Group
26 Sep - 04 Oct	LATAM Airlines Group
17 Sep - 21 Sep	LATAM Airlines Group
15 Sep - 05 Oct	LATAM Airlines Group
10 Sep - 05 Oct	LATAM Airlines Group
12 Sep - 30 Sep	LATAM Airlines Group
17 Sep - 05 Oct	Delta

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

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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Cheapest return flights from Chicago to Lima in September from $356

Return flights