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

Return flights

09 Oct - 14 Oct	KLM
03 Oct - 13 Oct	KLM
02 Oct - 15 Oct	KLM
02 Oct - 05 Oct	KLM
24 Oct - 30 Oct	KLM
09 Oct - 12 Oct	KLM
06 Oct - 12 Oct	KLM
10 Oct - 15 Oct	KLM
22 Oct - 26 Oct	Delta
22 Oct - 27 Oct	Delta
24 Oct - 03 Nov	Delta
24 Oct - 06 Nov	Delta
29 Oct - 05 Nov	KLM
30 Oct - 03 Nov	KLM
27 Oct - 03 Nov	Iberia	direct
30 Oct - 06 Nov	Iberia	direct
30 Oct - 03 Nov	Iberia	direct
28 Oct - 04 Nov	Iberia
24 Oct - 03 Nov	Iberia	direct
24 Oct - 06 Nov	Finnair	direct

Also check the deals for one-way flights from Madrid to Boston 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 Madrid to Boston in October from 371€

Return flights