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

Return flights

14 Apr - 08 May	Lufthansa
07 Apr - 24 Apr	Delta
23 Apr - 30 Apr	Lufthansa
17 Apr - 21 Apr	British Airways
17 Apr - 23 Apr	British Airways
23 Apr - 29 Apr	Lufthansa
07 Apr - 20 Apr	Delta
16 Apr - 20 Apr	British Airways
09 Apr - 15 Apr	British Airways
19 Apr - 25 Apr	British Airways
17 Apr - 08 May	Virgin Atlantic
28 Apr - 19 May	Delta
16 Apr - 08 May	Finnair
15 Apr - 08 May	Lufthansa
29 Apr - 03 May	SWISS
11 Apr - 19 Apr	Finnair
15 Apr - 18 May	British Airways
29 Apr - 05 May	United
23 Apr - 01 May	Lufthansa
28 Apr - 02 May	Air Canada

Also check the deals for one-way flights from San Francisco to Lisbon in April.

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 April from 417€

Return flights