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

Return flights

02 May - 13 May	China Airlines
02 May - 13 May	United	direct
02 May - 09 May	China Airlines
20 May - 26 May	United	direct
30 May - 14 Jun	EVA Air
30 May - 13 Jun	EVA Air
27 May - 17 Jun	Delta
22 May - 06 Jun	STARLUX Airlines
27 May - 17 Jun	United	direct
02 May - 09 May	Singapore Airlines	direct
22 May - 05 Jun	China Airlines
10 May - 20 May	Delta
18 May - 01 Jun	United	direct
18 May - 29 May	Delta
30 May - 14 Jun	United	direct
18 May - 29 May	United	direct
22 May - 05 Jun	United	direct
22 May - 06 Jun	United	direct
08 May - 22 May	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 $780

Return flights