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

Return flights

12 May - 06 Jun	LEVEL	direct
06 May - 13 May	LEVEL	direct
18 May - 25 May	LEVEL	direct
18 May - 13 Jun	LEVEL	direct
13 May - 20 May	LEVEL	direct
14 May - 19 May	LEVEL	direct
14 May - 21 May	LEVEL	direct
15 May - 06 Jun	LEVEL	direct
07 May - 21 May	LEVEL	direct
05 May - 26 May	Iberia	direct
21 May - 27 May	Condor
01 May - 09 May	LEVEL	direct
08 May - 30 May	TAP
28 May - 06 Jun	LEVEL	direct
29 May - 05 Jun	LEVEL	direct
24 May - 15 Jun	TAP
28 May - 20 Jun	TAP
25 May - 20 Jun	TAP
28 May - 20 Jun	LEVEL	direct
25 May - 20 Jun	LEVEL	direct

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 $436

Return flights