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

Return flights

01 Dec - 06 Dec	Copa
05 Dec - 12 Dec	Copa
01 Dec - 07 Dec	Delta
11 Dec - 23 Dec	Delta
06 Dec - 07 Dec	LATAM Airlines Group
31 Dec - 18 Jan	Avianca
14 Dec - 20 Jan	Avianca
28 Dec - 11 Jan	LATAM Airlines Group
14 Dec - 31 Jan	Avianca
28 Dec - 13 Jan	Avianca
14 Dec - 20 Dec	Volaris El Salvador
29 Dec - 06 Jan	LATAM Airlines Group
18 Dec - 31 Dec	Frontier Airlines
20 Dec - 31 Dec	Frontier Airlines
19 Dec - 27 Dec	LATAM Airlines Group
28 Dec - 05 Jan	LATAM Airlines Group
28 Dec - 02 Jan	Volaris El Salvador
21 Dec - 08 Jan	LATAM Airlines Group
24 Dec - 04 Jan	Frontier Airlines

Also check the deals for one-way flights from Washington to Buenos Aires 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 Buenos Aires in December from $627

Return flights