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

Return flights

27 Oct - 06 Nov	British Airways	direct
20 Oct - 20 Nov	Aer Lingus
14 Oct - 21 Oct	Aer Lingus
05 Oct - 16 Oct	Aer Lingus
01 Oct - 09 Oct	Aer Lingus
13 Oct - 22 Oct	Aer Lingus
15 Oct - 21 Oct	Aer Lingus
01 Oct - 08 Oct	Aer Lingus
06 Oct - 15 Oct	Aer Lingus
15 Oct - 23 Oct	Iberia
08 Oct - 06 Nov	Iberia
29 Oct - 05 Nov	Iberia
22 Oct - 28 Oct	Iberia
08 Oct - 05 Nov	Iberia
28 Oct - 22 Nov	Aer Lingus
27 Oct - 04 Nov	British Airways	direct
28 Oct - 04 Nov	American Airlines	direct
30 Oct - 22 Nov	TAP
31 Oct - 07 Nov	Iberia	direct
15 Oct - 22 Oct	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 $323

Return flights