AirHint found the following cheapest return flights from Boston (BOS) to Lima (LIM) in October 2025 (see full year).

Return flights

23 Oct - 30 Oct	Frontier Airlines
24 Oct - 30 Oct	Spirit Airlines
13 Oct - 25 Oct	Spirit Airlines
17 Oct - 25 Oct	Spirit Airlines
13 Oct - 24 Oct	Spirit Airlines
23 Oct - 28 Oct	Copa
23 Oct - 04 Nov	Copa
01 Oct - 15 Oct	Copa
28 Oct - 04 Nov	Copa
19 Oct - 02 Nov	Spirit Airlines
04 Oct - 08 Oct	Spirit Airlines
01 Oct - 17 Oct	Copa
16 Oct - 01 Nov	Frontier Airlines
09 Oct - 13 Oct	Avianca

Also check the deals for one-way flights from Boston to Lima in October.

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 Boston to Lima in October from 349€

Return flights