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

Return flights

01 Dec - 08 Dec	LATAM Airlines Group
04 Dec - 13 Dec	Copa
01 Dec - 06 Dec	Copa
08 Dec - 14 Dec	Delta
30 Dec - 20 Jan	LATAM Airlines Group
05 Dec - 21 Dec	United
16 Dec - 22 Dec	United
20 Dec - 31 Jan	Frontier Airlines
24 Dec - 31 Dec	LATAM Airlines Group
27 Dec - 07 Jan	LATAM Airlines Group
24 Dec - 09 Jan	Frontier Airlines
26 Dec - 09 Jan	Frontier Airlines
20 Dec - 27 Dec	Frontier Airlines
30 Dec - 06 Jan	LATAM Airlines Group
26 Dec - 10 Jan	Frontier Airlines
20 Dec - 10 Jan	Frontier Airlines
27 Dec - 05 Jan	LATAM Airlines Group
16 Dec - 11 Jan	Avianca

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.

Book a cheap hotel in Santiago

Cheap car rent in Santiago

Cheapest return flights from Washington to Santiago in December from 408€

Return flights