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

Return flights

19 May - 26 May	Air Canada
15 May - 21 May	SWISS
11 May - 25 May	British Airways
19 May - 26 May	TAP	direct
15 May - 21 May	TAP	direct
14 May - 28 May	TAP	direct
07 May - 14 May	Delta
21 May - 29 May	TAP	direct

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 611€

Return flights