To enter the United States of America, a passport valid for the duration of stay is required by nationals in the chart above. Passport note : All travellers entering the USA under the Visa Waiver Program require individual machine-readable passports.alidity : Visas may be used for travel to the USA until the date of expiry as long as presented with a valid passport. Some visas are valid for multiple entries. The length of stay in the USA is determined by US immigration officials at the time of entry.