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

Return flights

30 Jun - 07 Jul	Air Canada
29 Jun - 15 Jul	Air Canada
30 Jun - 14 Jul	SWISS
29 Jun - 16 Jul	Air Canada
29 Jun - 08 Jul	Air Canada
30 Jun - 08 Jul	SWISS
28 Jun - 07 Jul	SWISS
30 Jun - 09 Jul	Lufthansa
29 Jun - 07 Jul	SWISS
29 Jun - 09 Jul	SWISS
26 Jun - 30 Jun	SWISS
28 Jun - 30 Jun	SWISS
28 Jun - 30 Jun	TAP	direct

Also check the deals for one-way flights from Boston to Lisbon in June.

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 June from $590

Return flights