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

Return flights

14 Jul - 28 Jul	LEVEL
08 Jul - 15 Jul	British Airways
28 Jul - 07 Aug	LEVEL
16 Jul - 20 Jul	LEVEL
10 Jul - 20 Jul	LEVEL
09 Jul - 31 Jul	LEVEL
24 Jul - 07 Aug	Aer Lingus
11 Jul - 28 Jul	LEVEL
24 Jul - 02 Aug	Aer Lingus
19 Jul - 07 Aug	Aer Lingus
11 Jul - 13 Jul	American Airlines
02 Jul - 08 Jul	Iberia
18 Jul - 05 Aug	Iberia
16 Jul - 28 Jul	Aer Lingus
30 Jul - 10 Aug	TAP	direct
30 Jul - 05 Aug	TAP	direct
18 Jul - 02 Aug	Aer Lingus
25 Jul - 10 Aug	LEVEL
21 Jul - 04 Aug	LEVEL
01 Jul - 08 Jul	LEVEL

Also check the deals for one-way flights from Lisbon to Boston 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 Lisbon to Boston in July from $669

Return flights