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

Return flights

15 Sep - 22 Sep	LEVEL	direct
24 Sep - 28 Sep	Iberia	direct
28 Sep - 05 Oct	Iberia	direct
10 Sep - 17 Sep	LEVEL	direct
10 Sep - 28 Sep	LEVEL	direct
02 Sep - 05 Sep	Iberia	direct
06 Sep - 09 Sep	Iberia	direct
07 Sep - 10 Sep	Iberia	direct
07 Sep - 14 Sep	Iberia	direct
08 Sep - 11 Sep	Iberia	direct
08 Sep - 15 Sep	Iberia	direct
29 Sep - 06 Oct	Iberia
30 Sep - 07 Oct	Iberia
24 Sep - 01 Oct	Iberia
28 Sep - 12 Oct	Air Canada
15 Sep - 06 Oct	Iberia
15 Sep - 06 Oct	LEVEL	direct
29 Sep - 02 Oct	Iberia	direct
30 Sep - 03 Oct	Iberia	direct
28 Sep - 12 Oct	LEVEL	direct

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

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 September from $382

Return flights