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

Return flights

03 Oct - 13 Oct	Iberia
14 Oct - 22 Oct	Iberia
06 Oct - 14 Oct	Iberia
07 Oct - 14 Oct	Iberia
01 Oct - 08 Oct	Iberia For Level
06 Oct - 13 Oct	Iberia For Level
15 Oct - 22 Oct	Iberia For Level
22 Oct - 29 Oct	Iberia For Level
01 Oct - 10 Oct	Iberia For Level
03 Oct - 07 Oct	Iberia
28 Oct - 05 Nov	Iberia For Level
28 Oct - 04 Nov	Iberia For Level
27 Oct - 03 Nov	Iberia For Level
24 Oct - 03 Nov	Iberia For Level
26 Oct - 02 Nov	Icelandair
28 Oct - 05 Nov	TAP	direct
31 Oct - 07 Nov	Icelandair
31 Oct - 07 Nov	TAP	direct
25 Oct - 01 Nov	Aer Lingus
25 Oct - 01 Nov	Delta	direct

Also check the deals for one-way flights from Boston to Lisbon 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 Lisbon in October from $374

Return flights