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

Return flights

27 Oct - 05 Nov	Iberia For Level
28 Oct - 04 Nov	Iberia For Level
14 Oct - 22 Oct	Iberia For Level
22 Oct - 26 Oct	Icelandair
19 Oct - 08 Nov	Aer Lingus
21 Oct - 15 Nov	Aer Lingus
13 Oct - 08 Nov	Aer Lingus
20 Oct - 15 Nov	Aer Lingus
18 Oct - 08 Nov	Aer Lingus
31 Oct - 06 Nov	Aer Lingus
01 Oct - 09 Oct	Icelandair
11 Oct - 19 Oct	Icelandair
27 Oct - 03 Nov	Iberia For Level
15 Oct - 08 Nov	Iberia
06 Oct - 14 Oct	Brussels Airlines
07 Oct - 14 Oct	Lufthansa
08 Oct - 13 Oct	SWISS
12 Oct - 31 Oct	SWISS
02 Oct - 06 Oct	Lufthansa
03 Oct - 14 Oct	SWISS

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 358€

Return flights