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

Return flights

10 Dec - 14 Dec	Copa
08 Dec - 21 Dec	LATAM Airlines Group
09 Dec - 19 Dec	Copa
12 Dec - 18 Jan	Copa
26 Dec - 01 Jan	Avianca
19 Dec - 27 Dec	LATAM Airlines Group
20 Dec - 27 Dec	LATAM Airlines Group
25 Dec - 10 Jan	Copa
21 Dec - 31 Dec	LATAM Airlines Group
17 Dec - 08 Jan	Copa
25 Dec - 04 Jan	Avianca
26 Dec - 04 Jan	Avianca
01 Dec - 08 Jan	Copa
24 Dec - 04 Jan	Avianca
23 Dec - 04 Jan	Air Canada
21 Dec - 28 Dec	United
21 Dec - 17 Jan	Air Canada

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 $631

Return flights