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

Return flights

17 Mar - 21 Mar	Avianca
21 Mar - 24 Mar	Copa
16 Mar - 21 Mar	Copa
20 Mar - 29 Mar	Copa
26 Mar - 31 Mar	Avianca
29 Mar - 02 Apr	Avianca
27 Mar - 06 Apr	Copa
08 Mar - 15 Mar	United	direct
27 Mar - 04 Apr	Copa
28 Mar - 04 Apr	Avianca
28 Mar - 03 Apr	Avianca
27 Mar - 03 Apr	Avianca
28 Mar - 04 Apr	United	direct

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

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 March from 291€

Return flights