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

Return flights

01 Dec - 06 Dec	Copa
05 Dec - 21 Dec	LATAM Airlines Group
04 Dec - 13 Dec	LATAM Airlines Group
30 Dec - 20 Jan	American Airlines
29 Dec - 19 Jan	LATAM Airlines Group
30 Dec - 12 Jan	LATAM Airlines Group
24 Dec - 31 Dec	Frontier Airlines
16 Dec - 11 Jan	Avianca
19 Dec - 31 Dec	Frontier Airlines
20 Dec - 10 Jan	Frontier Airlines
26 Dec - 01 Jan	Copa
18 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Washington to Santiago 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 Santiago in December from $502

Return flights