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

Return flights

04 Mar - 11 Mar	Avianca
04 Mar - 10 Mar	Avianca
04 Mar - 09 Mar	Avianca
05 Mar - 09 Mar	Copa
05 Mar - 10 Mar	Copa
03 Mar - 09 Mar	Copa
08 Mar - 12 Mar	Avianca
11 Mar - 18 Mar	Avianca
21 Mar - 24 Mar	Copa
01 Mar - 07 Mar	Copa
25 Mar - 01 Apr	Avianca
30 Mar - 10 Apr	Allegiant Air
31 Mar - 06 Apr	Avianca
30 Mar - 06 Apr	Breeze Airways
27 Mar - 07 Apr	Allegiant Air
29 Mar - 03 Apr	Avianca
31 Mar - 05 Apr	Avianca
26 Mar - 02 Apr	Avianca
27 Mar - 11 Apr	Allegiant Air
30 Mar - 05 Apr	Avianca

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 241€

Return flights