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

Return flights

28 Aug - 06 Sep	TAP	direct
27 Aug - 31 Aug	KLM
27 Aug - 10 Sep	KLM
25 Aug - 01 Sep	Air France
29 Aug - 02 Sep	Air France
29 Aug - 13 Sep	Air France
25 Aug - 01 Sep	Air France	direct
29 Aug - 02 Sep	Air France	direct
30 Aug - 06 Sep	Air France	direct
29 Aug - 13 Sep	Air France	direct
26 Aug - 01 Sep	Aer Lingus
26 Aug - 31 Aug	Iberia For Level
22 Aug - 31 Aug	Air Europa
14 Aug - 20 Aug	Azores Airlines
14 Aug - 19 Aug	Azores Airlines
06 Aug - 30 Aug	Lufthansa
14 Aug - 31 Aug	Azores Airlines
07 Aug - 12 Aug	Air France
03 Aug - 11 Aug	Air France
02 Aug - 11 Aug	Air France

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

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.

Book a cheap hotel in Boston

Cheap car rent in Boston

Cheapest return flights from Lisbon to Boston in August from 497€

Return flights