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

Return flights

18 Aug - 25 Aug	Air Canada
05 Aug - 16 Sep	Air Canada
17 Aug - 28 Aug	Air Canada
14 Aug - 21 Aug	United
20 Aug - 27 Aug	United
26 Aug - 12 Sep	Air Canada
26 Aug - 10 Sep	Air Canada
13 Aug - 24 Aug	Air Canada
31 Aug - 16 Sep	Iberia
26 Aug - 02 Sep	United
24 Aug - 31 Aug	United
22 Aug - 29 Aug	United
04 Aug - 11 Aug	United
06 Aug - 13 Aug	United
12 Aug - 19 Aug	United
30 Aug - 26 Sep	Spirit Airlines
30 Aug - 28 Sep	Spirit Airlines
30 Aug - 27 Sep	British Airways
30 Aug - 29 Sep	Lufthansa
28 Aug - 04 Sep	United

Also check the deals for one-way flights from San Diego 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 Diego to Lisbon in August from $587

Return flights