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

Return flights

30 Jul - 12 Aug	Air France
24 Jul - 31 Jul	Air France
27 Jul - 03 Aug	Delta
31 Jul - 26 Aug	Air France
24 Jul - 02 Aug	Air France
27 Jul - 07 Aug	Air France
31 Jul - 03 Aug	Air France
25 Jul - 02 Aug	Air France
27 Jul - 04 Aug	Air France
29 Jul - 05 Aug	KLM
24 Jul - 31 Jul	Virgin Atlantic	direct
29 Jul - 05 Aug	Virgin Atlantic	direct
22 Jul - 29 Jul	Azores Airlines
22 Jul - 29 Jul	Virgin Atlantic	direct
22 Jul - 23 Jul	Azores Airlines
27 Jul - 31 Jul	Air France
27 Jul - 31 Jul	Air France	direct
22 Jul - 23 Jul	Air France	direct

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 675€

Return flights