For U.S. citizens traveling with a regular passport in 2026, you can stay in Singapore for up to 90 days without a visa for tourism or business purposes. However, this is not a guaranteed right; the actual duration of stay is determined by the Immigration and Checkpoints Authority (ICA) officer at the point of entry. To be granted this stay, you must have at least six months of validity remaining on your passport, proof of sufficient funds for your stay, and a confirmed onward or return ticket. Additionally, all travelers—including those who are visa-exempt—must submit their SG Arrival Card (SGAC) electronically via the official ICA website or app within three days prior to arrival. If you wish to stay longer than 90 days, you must apply for an extension through the ICA's "e-Extend" system before your initial pass expires. Travelers from other "Level 1" countries typically receive a 30-day visa-free stay, which can sometimes be extended locally.