AirHint found the following cheapest return flights from Boston (BOS) to San Jose (SJO) in May 2026 (see full year).

Return flights

08 May - 19 May	Spirit Airlines
13 May - 01 Jun	Spirit Airlines
15 May - 19 May	Spirit Airlines
21 May - 25 May	Copa
21 May - 01 Jun	Spirit Airlines
15 May - 01 Jun	Spirit Airlines
13 May - 25 May	Spirit Airlines
21 May - 10 Jun	Spirit Airlines
08 May - 25 May	Spirit Airlines
15 May - 25 May	Spirit Airlines

Also check the deals for one-way flights from Boston to San Jose in May.

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.

Book a cheap hotel in San Jose

Cheap car rent in San Jose

Cheapest return flights from Boston to San Jose in May from 310€

Return flights