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

Return flights

18 Aug - 27 Aug	Iberia
25 Aug - 01 Sep	Iberia
26 Aug - 02 Sep	Scandinavian Airlines
17 Aug - 24 Aug	Iberia
20 Aug - 29 Aug	TAP
31 Aug - 07 Sep	Iberia
22 Aug - 30 Aug	Scandinavian Airlines
04 Aug - 12 Aug	Iberia
05 Aug - 12 Aug	Iberia
14 Aug - 22 Aug	TAP
11 Aug - 19 Aug	Iberia
12 Aug - 18 Aug	Iberia
30 Aug - 06 Sep	Aer Lingus
04 Aug - 20 Aug	Aer Lingus
26 Aug - 02 Sep	Air France	direct
25 Aug - 01 Sep	Virgin Atlantic	direct
30 Aug - 06 Sep	Virgin Atlantic	direct
31 Aug - 07 Sep	Virgin Atlantic	direct

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

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Cheapest return flights from Boston to Lisbon in August from $473

Return flights