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

Return flights

24 Aug - 09 Sep	Avianca
22 Aug - 04 Sep	Avianca
22 Aug - 29 Aug	Avianca
21 Aug - 02 Sep	Avianca
14 Aug - 21 Aug	Copa
15 Aug - 21 Aug	Copa
23 Aug - 30 Aug	Copa
13 Aug - 21 Aug	Copa
13 Aug - 25 Aug	Copa
20 Aug - 26 Aug	Copa
15 Aug - 24 Aug	Copa
17 Aug - 24 Aug	Copa
29 Aug - 04 Sep	Copa
14 Aug - 17 Sep	Copa
14 Aug - 12 Sep	Copa
29 Aug - 14 Sep	Copa
30 Aug - 14 Sep	Copa
29 Aug - 03 Sep	Copa
29 Aug - 09 Sep	Copa
10 Aug - 22 Aug	Copa

Also check the deals for one-way flights from Washington to Lima in August.

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 August from 303€

Return flights