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

One-Way flights

19 Aug	Iberia
18 Aug	Frontier Airlines
05 Aug	Iberia
26 Aug	Iberia
14 Aug	Iberia For Level
03 Aug	British Airways
11 Aug	British Airways
10 Aug	Iberia
21 Aug	Frontier Airlines
16 Aug	Hawaiian Airlines

Also check the deals for return 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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest one-way flights from San Francisco to Lisbon in August from 226€

One-Way flights