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

Return flights

28 Jan - 31 Jan	Volaris El Salvador
26 Jan - 29 Jan	Copa
26 Jan - 29 Jan	Avianca	direct
26 Jan - 31 Jan	Avianca	direct
24 Jan - 31 Jan	Avianca	direct
01 Jan - 15 Jan	Avianca	direct
08 Jan - 13 Jan	Avianca	direct
05 Jan - 12 Jan	Avianca	direct
31 Jan - 07 Feb	Volaris El Salvador
24 Jan - 04 Feb	Avianca
24 Jan - 02 Feb	Avianca
24 Jan - 01 Feb	Avianca
16 Jan - 23 Jan	Avianca
24 Jan - 03 Feb	Avianca
05 Jan - 11 Jan	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 $230

Return flights