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

One-Way flights

30 Aug	Spirit Airlines
18 Aug	Spirit Airlines
15 Aug	Spirit Airlines
09 Aug	Spirit Airlines
23 Aug	Spirit Airlines
28 Aug	Frontier Airlines
10 Aug	Spirit Airlines
17 Aug	Spirit Airlines
03 Aug	Spirit Airlines
27 Aug	Frontier Airlines

Also check the deals for return 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 one-way flights from San Diego to Lisbon in August from 265€

One-Way flights