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

Return flights

09 May - 16 May	TAP
08 May - 17 May	TAP
04 May - 07 May	Iberia	direct
12 May - 15 May	Iberia	direct
05 May - 08 May	Iberia	direct
09 May - 16 May	LEVEL	direct
18 May - 03 Jun	LEVEL	direct
01 May - 04 May	Iberia	direct
02 May - 09 May	Iberia	direct
06 May - 09 May	Iberia	direct
19 May - 26 May	Iberia	direct
27 May - 03 Jun	Iberia	direct
26 May - 02 Jun	SWISS
25 May - 05 Jun	Aer Lingus
26 May - 02 Jun	LEVEL	direct
25 May - 05 Jun	LEVEL	direct
29 May - 05 Jun	Iberia	direct
30 May - 02 Jun	Iberia	direct
31 May - 07 Jun	Iberia

Also check the deals for one-way flights from Boston to Barcelona 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.

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Cheapest return flights from Boston to Barcelona in May from 336€

Return flights