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

Return flights

09 Dec - 13 Jan	Avianca
01 Dec - 01 Jan	Avianca
22 Dec - 12 Jan	Avianca
12 Dec - 15 Jan	Frontier Airlines
15 Dec - 22 Dec	LATAM Airlines Group
17 Dec - 27 Dec	Avianca
18 Dec - 22 Dec	Avianca
18 Dec - 26 Dec	Avianca

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

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 December from $489

Return flights