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

Return flights

14 May - 21 May	TAP	direct
01 May - 12 May	Lufthansa
02 May - 23 May	United
14 May - 03 Jun	Turkish Airlines
14 May - 03 Jun	TAP	direct
26 May - 02 Jun	Air Canada
27 May - 03 Jun	Air Canada
18 May - 13 Jun	Lufthansa
14 May - 06 Jun	TAP	direct
21 May - 13 Jun	United
01 May - 12 May	TAP	direct
28 May - 04 Jun	Air Canada
29 May - 05 Jun	Air Canada
31 May - 07 Jun	Lufthansa
02 May - 23 May	TAP	direct
04 May - 11 May	TAP

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

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 May from 531€

Return flights