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

Return flights

24 Jan - 27 Jan	Avianca
24 Jan - 29 Jan	Avianca
19 Jan - 29 Jan	Avianca
31 Jan - 07 Feb	Avianca
26 Jan - 30 Jan	Avianca
29 Jan - 07 Feb	Avianca
19 Jan - 26 Jan	United
22 Jan - 24 Jan	United
23 Jan - 28 Jan	Avianca
27 Jan - 31 Jan	Avianca
15 Jan - 24 Jan	Avianca
14 Jan - 25 Jan	Avianca
22 Jan - 01 Feb	Avianca
29 Jan - 01 Feb	Avianca
23 Jan - 01 Feb	Avianca
30 Jan - 08 Feb	Copa

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 188€

Return flights