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

Return flights

08 May - 15 May	Icelandair
09 May - 16 May	TAP
02 May - 08 May	Icelandair
03 May - 09 May	Icelandair
08 May - 16 May	Icelandair
09 May - 18 May	TAP
11 May - 18 May	TAP
13 May - 20 May	TAP
18 May - 25 May	Scandinavian Airlines
14 May - 21 May	Icelandair
28 May - 04 Jun	Condor
18 May - 03 Jun	LEVEL	direct
30 May - 06 Jun	Icelandair
26 May - 08 Jun	Condor
25 May - 13 Jun	Condor
29 May - 05 Jun	Condor
31 May - 07 Jun	Condor
19 May - 13 Jun	Condor
19 May - 13 Jun	LEVEL	direct
27 May - 08 Jun	TAP

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 316€

Return flights