AirHint found the following cheapest return flights from Washington (IAD) to San Jose (SJO) in January 2026 (see full year).

Return flights

22 Jan - 29 Jan	Avianca	direct
24 Jan - 29 Jan	Avianca	direct
27 Jan - 31 Jan	Avianca	direct
20 Jan - 26 Jan	Copa
21 Jan - 26 Jan	Copa
20 Jan - 24 Jan	Copa
25 Jan - 31 Jan	Avianca
20 Jan - 25 Jan	Copa
21 Jan - 25 Jan	Copa
24 Jan - 27 Jan	Copa
29 Jan - 02 Feb	Copa
31 Jan - 07 Feb	Copa
25 Jan - 02 Feb	Copa
29 Jan - 01 Feb	Copa
31 Jan - 14 Feb	United

Also check the deals for one-way flights from Washington to San Jose in January.

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 San Jose in January from 238€

Return flights