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

Return flights

26 Sep - 09 Oct	Avianca
26 Sep - 29 Sep	Avianca
30 Sep - 05 Oct	Avianca
30 Sep - 06 Oct	Avianca
21 Sep - 28 Sep	Avianca
25 Sep - 02 Oct	Avianca
26 Sep - 12 Oct	United
27 Sep - 10 Oct	Delta
26 Sep - 04 Oct	Avianca
23 Sep - 29 Sep	Avianca
28 Sep - 28 Sep	Delta

Also check the deals for one-way flights from Washington 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 Washington to Lima in September from 325€

Return flights