AirHint found the following cheapest return flights from Boston (BOS) to Lisbon (LIS) in July 2026 (see full year).

Return flights

22 Jul - 05 Aug	SWISS
21 Jul - 04 Aug	Air Canada
22 Jul - 05 Aug	Air France	direct
21 Jul - 04 Aug	Air France	direct
23 Jul - 01 Aug	Air Canada
14 Jul - 08 Aug	SWISS
18 Jul - 01 Aug	Aer Lingus
18 Jul - 01 Aug	Air France	direct
23 Jul - 01 Aug	Air France	direct
14 Jul - 08 Aug	TAP	direct

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

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 July from 473€

Return flights