AirHint found the following cheapest return flights from Boston (BOS) to Barcelona (BCN) in October 2025 (see full year).

Return flights

23 Oct - 06 Nov	Iberia For Level	direct
19 Oct - 08 Nov	Iberia For Level	direct
14 Oct - 08 Nov	Iberia For Level	direct
13 Oct - 08 Nov	Iberia For Level	direct
21 Oct - 31 Oct	Air Canada
29 Oct - 06 Nov	Air Canada
14 Oct - 28 Oct	Air Canada
13 Oct - 22 Oct	Air Canada
13 Oct - 24 Oct	American Airlines	direct
01 Oct - 08 Oct	Austrian Airlines
15 Oct - 22 Oct	Lufthansa
07 Oct - 14 Oct	Aer Lingus
01 Oct - 09 Oct	Austrian Airlines
23 Oct - 09 Nov	Icelandair
13 Oct - 28 Oct	SWISS
22 Oct - 29 Oct	Lufthansa
16 Oct - 08 Nov	TAP
26 Oct - 07 Nov	Air Canada
17 Oct - 08 Nov	TAP
27 Oct - 22 Nov	TAP

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

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 October from $328

Return flights