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

Return flights

31 Oct - 15 Nov	TAP
16 Oct - 19 Oct	United
09 Oct - 16 Oct	United
16 Oct - 21 Oct	United
09 Oct - 19 Oct	United
15 Oct - 20 Oct	Lufthansa
29 Oct - 03 Nov	Lufthansa
15 Oct - 22 Oct	Lufthansa
07 Oct - 14 Oct	Lufthansa
09 Oct - 18 Oct	Lufthansa
22 Oct - 26 Oct	Delta
05 Oct - 13 Oct	KLM
30 Oct - 07 Nov	Delta
23 Oct - 04 Nov	KLM
28 Oct - 04 Nov	KLM
30 Oct - 10 Nov	KLM
29 Oct - 05 Nov	Iberia
28 Oct - 05 Nov	KLM
29 Oct - 02 Nov	KLM
30 Oct - 02 Nov	KLM

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 $459

Return flights