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

Return flights

22 May - 07 Jun	United	direct
11 May - 23 May	Korean Air
27 May - 11 Jun	Korean Air
27 May - 10 Jun	Korean Air
11 May - 23 May	United	direct
27 May - 10 Jun	Singapore Airlines	direct
27 May - 11 Jun	Singapore Airlines	direct

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 $841

Return flights