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

Return flights

18 Aug - 25 Aug	Air Canada
17 Aug - 24 Aug	Air Canada
12 Aug - 19 Aug	Air Canada
19 Aug - 26 Aug	Air Canada
11 Aug - 18 Aug	Air France
25 Aug - 01 Sep	Scandinavian Airlines
20 Aug - 27 Aug	Air Canada
13 Aug - 20 Aug	Air Canada
22 Aug - 29 Aug	Scandinavian Airlines
21 Aug - 28 Aug	British Airways
24 Aug - 31 Aug	Scandinavian Airlines

Also check the deals for one-way flights from San Francisco 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 San Francisco to Lisbon in August from 456€

Return flights