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

Return flights

07 Mar - 21 Mar	Volaris El Salvador
07 Mar - 14 Mar	Volaris El Salvador
07 Mar - 13 Mar	Volaris El Salvador
08 Mar - 14 Mar	Volaris El Salvador
04 Mar - 08 Mar	Avianca
08 Mar - 15 Mar	Volaris El Salvador
16 Mar - 23 Mar	Copa
09 Mar - 14 Mar	Volaris El Salvador
09 Mar - 15 Mar	Avianca
06 Mar - 13 Mar	Air Canada
30 Mar - 10 Apr	Avianca
28 Mar - 03 Apr	Copa
28 Mar - 05 Apr	Copa
29 Mar - 04 Apr	Copa
28 Mar - 04 Apr	Copa

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 206€

Return flights