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

Return flights

10 May - 20 May	Icelandair
19 May - 26 May	Condor
01 May - 04 May	Iberia	direct
01 May - 05 May	LEVEL	direct
01 May - 08 May	LEVEL	direct
12 May - 19 May	LEVEL	direct
05 May - 12 May	LEVEL	direct
26 May - 02 Jun	Condor
04 May - 11 May	LEVEL	direct
01 May - 09 May	TAP
02 May - 05 May	Iberia	direct
25 May - 13 Jun	Condor
19 May - 13 Jun	Condor
11 May - 30 Jun	Condor
28 May - 04 Jun	Condor
28 May - 13 Jun	Condor
29 May - 05 Jun	Condor
31 May - 07 Jun	Condor
27 May - 03 Jun	Condor
17 May - 07 Jun	Air Canada

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 $381

Return flights