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

Return flights

20 Jan - 24 Jan	United
29 Jan - 10 Feb	Avianca
27 Jan - 31 Jan	Avianca	direct
19 Jan - 24 Jan	United
28 Jan - 31 Jan	Avianca
24 Jan - 27 Jan	Copa
22 Jan - 26 Jan	Copa
29 Jan - 05 Feb	Copa
29 Jan - 02 Feb	Copa
22 Jan - 25 Jan	Copa
29 Jan - 01 Feb	Copa
19 Jan - 24 Jan	Avianca	direct
20 Jan - 24 Jan	Avianca	direct
31 Jan - 07 Feb	Avianca
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 237€

Return flights