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

Return flights

22 Jan - 28 Jan	United
22 Jan - 27 Jan	United
27 Jan - 31 Jan	Avianca
24 Jan - 29 Jan	Avianca	direct
24 Jan - 31 Jan	Avianca	direct
20 Jan - 24 Jan	Copa
17 Jan - 24 Jan	Copa
05 Jan - 12 Jan	Frontier Airlines
14 Jan - 20 Jan	Copa
08 Jan - 17 Jan	Avianca

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 200€

Return flights