AirHint found the following cheapest one-way flights from Singapore (SIN) to San Francisco (SFO) in May 2026 (see full year).
One-Way flights
| 02 May | Cebu Pacific | ||
| 25 May | Cebu Pacific | ||
| 18 May | China Eastern | ||
| 23 May | China Eastern | ||
| 11 May | Korean Air | ||
| 20 May | Korean Air | ||
| 19 May | Korean Air | ||
| 25 May | United | direct | |
| 11 May | United | direct | |
| 15 May | United | direct |
Also check the deals for return flights from Singapore to San Francisco in May.
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