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

Return flights

27 Sep - 11 Oct	Avianca
28 Sep - 13 Oct	Avianca
19 Sep - 05 Oct	Avianca
26 Sep - 29 Sep	Avianca
20 Sep - 30 Sep	Avianca
19 Sep - 21 Sep	Avianca
24 Sep - 28 Sep	Avianca
18 Sep - 28 Sep	Avianca
23 Sep - 01 Oct	Avianca
28 Sep - 09 Oct	Copa
12 Sep - 19 Sep	Avianca
09 Sep - 14 Oct	Avianca
19 Sep - 04 Oct	Avianca
15 Sep - 30 Sep	Avianca
11 Sep - 19 Sep	Avianca
04 Sep - 23 Sep	Avianca
09 Sep - 13 Sep	Avianca
18 Sep - 01 Oct	Avianca
20 Sep - 10 Oct	Avianca
29 Sep - 08 Oct	Delta

Also check the deals for one-way flights from San Francisco 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 San Francisco to Lima in September from $540

Return flights