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

Return flights

01 May - 17 May	China Airlines
04 May - 19 May	China Airlines
01 May - 16 May	China Airlines
14 May - 26 May	China Airlines
07 May - 22 May	China Airlines
19 May - 30 May	China Airlines
17 May - 30 May	China Airlines
16 May - 26 May	United	direct
14 May - 26 May	United	direct
01 May - 17 May	Singapore Airlines	direct
26 May - 09 Jun	Air Canada
25 May - 08 Jun	Delta

Also check the deals for one-way flights from Singapore to San Francisco 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 Singapore to San Francisco in May from 661€

Return flights