Entry Requirements : for US Citizens only.
A valid passport is required. U.S. citizens do not need a visa if their visit is for business or pleasure and their stay is for 90 days or less. The Government of Singapore generally allows Americans to enter with less than six months of validity remaining on their passport, but some neighboring countries, particularly Indonesia, do not.
Passport Requirement for Singapore :
Passport valid for at least six months beyond date of departure required by all.
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