AirHint found the following cheapest return flights from Boston (BOS) to Madrid (MAD) in October 2026 (see full year).

Return flights

06 Oct - 20 Oct	Finnair	direct
13 Oct - 20 Oct	Finnair	direct
14 Oct - 21 Oct	Iberia	direct
21 Oct - 28 Oct	Iberia	direct
07 Oct - 14 Oct	Iberia	direct
06 Oct - 13 Oct	Iberia	direct
01 Oct - 15 Oct	Finnair	direct
28 Oct - 04 Nov	Iberia	direct
15 Oct - 22 Oct	Iberia	direct
08 Oct - 15 Oct	Iberia	direct
01 Oct - 08 Oct	Iberia	direct
26 Oct - 02 Nov	Iberia	direct
27 Oct - 03 Nov	Iberia
31 Oct - 07 Nov	Iberia
30 Oct - 06 Nov	Iberia
29 Oct - 05 Nov	Iberia
25 Oct - 01 Nov	Iberia
30 Oct - 02 Nov	Iberia
29 Oct - 01 Nov	Iberia	direct
31 Oct - 03 Nov	Iberia

Also check the deals for one-way flights from Boston to Madrid 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 Madrid in October from $309

Return flights