AirHint found the following cheapest return flights from Oakland (OAK) to Singapore (SIN) in April 2026 (see full year).
Return flights
| 01 Apr - 20 Apr | Korean Air | ||
| 11 Apr - 12 May | Korean Air | ||
| 03 Apr - 12 Apr | Qatar Airways | ||
| 02 Apr - 11 Apr | Korean Air |
Also check the deals for one-way flights from Oakland to Singapore in April.
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