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

Return flights

19 Oct - 26 Oct	Iberia	direct
04 Oct - 10 Oct	Air Canada
22 Oct - 15 Nov	Finnair
22 Oct - 26 Oct	Iberia	direct
23 Oct - 26 Oct	Iberia	direct
09 Oct - 12 Oct	Iberia	direct
02 Oct - 05 Oct	Iberia
09 Oct - 24 Oct	Air Canada
27 Oct - 03 Nov	Iberia	direct
15 Oct - 18 Oct	Iberia	direct
16 Oct - 19 Oct	Iberia	direct
01 Oct - 04 Oct	Iberia	direct
22 Oct - 15 Nov	Iberia	direct
30 Oct - 02 Nov	Iberia
29 Oct - 01 Nov	Iberia
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 $374

Return flights