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

Return flights

14 Aug - 30 Aug	United
19 Aug - 26 Aug	Virgin Atlantic
17 Aug - 28 Aug	Delta
23 Aug - 30 Aug	United
31 Aug - 24 Sep	British Airways
06 Aug - 14 Aug	British Airways
29 Aug - 05 Sep	Delta
30 Aug - 16 Sep	Delta
27 Aug - 01 Sep	KLM
13 Aug - 20 Aug	United
30 Aug - 27 Sep	Delta
30 Aug - 06 Sep	Delta
30 Aug - 29 Sep	Delta
29 Aug - 14 Sep	Delta
30 Aug - 14 Sep	Delta
17 Aug - 24 Aug	United
25 Aug - 01 Sep	United
05 Aug - 12 Aug	United
21 Aug - 28 Aug	United
15 Aug - 22 Aug	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 513€

Return flights