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

Return flights

03 Dec - 08 Dec	Avianca
01 Dec - 10 Dec	Avianca
01 Dec - 09 Dec	Avianca
06 Dec - 16 Dec	LATAM Airlines Group
07 Dec - 09 Dec	United
08 Dec - 18 Dec	Frontier Airlines
07 Dec - 13 Jan	Copa
08 Dec - 14 Jan	Avianca
08 Dec - 13 Jan	Frontier Airlines
10 Dec - 19 Dec	Avianca
15 Dec - 22 Dec	Breeze Airways
12 Dec - 15 Jan	Avianca
22 Dec - 24 Dec	LATAM Airlines Group
13 Dec - 21 Dec	Frontier Airlines
28 Dec - 12 Jan	Frontier Airlines
01 Dec - 01 Jan	LATAM Airlines Group
24 Dec - 04 Jan	Allegiant Air
09 Dec - 13 Jan	Avianca
22 Dec - 01 Jan	LATAM Airlines Group
25 Dec - 11 Jan	Frontier Airlines

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 $389

Return flights