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

Return flights

24 Aug - 29 Sep	Avianca
24 Aug - 28 Aug	Avianca
25 Aug - 24 Sep	Avianca
24 Aug - 05 Sep	Avianca
27 Aug - 11 Sep	Avianca
29 Aug - 04 Sep	Avianca
12 Aug - 30 Aug	Copa
29 Aug - 12 Sep	Copa
22 Aug - 08 Sep	Avianca
12 Aug - 21 Aug	Copa
22 Aug - 26 Aug	Copa
13 Aug - 21 Aug	Copa
13 Aug - 25 Aug	Copa
18 Aug - 25 Aug	Copa
29 Aug - 07 Sep	Copa
30 Aug - 14 Sep	Copa
25 Aug - 01 Sep	Copa
14 Aug - 18 Aug	Copa
15 Aug - 19 Aug	Copa
14 Aug - 19 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 $355

Return flights