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

Return flights

29 Jul - 29 Aug	Air Canada
10 Jul - 17 Jul	Air Canada
26 Jul - 30 Aug	Air Canada
14 Jul - 21 Jul	Air Canada
10 Jul - 16 Jul	Air Canada
28 Jul - 06 Aug	Air Canada
30 Jul - 07 Aug	Air Canada
30 Jul - 05 Aug	Air Canada
28 Jul - 05 Aug	Air Canada
28 Jul - 07 Aug	Air Canada
21 Jul - 04 Aug	Air Canada
24 Jul - 29 Jul	United
22 Jul - 29 Jul	United
21 Jul - 07 Aug	Air Canada
29 Jul - 05 Aug	SWISS
12 Jul - 19 Jul	SWISS
09 Jul - 14 Jul	Lufthansa
15 Jul - 22 Jul	British Airways
09 Jul - 16 Jul	Air Canada
09 Jul - 17 Jul	Lufthansa

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 $457

Return flights