The Vietnam visa on arrival for us citizens is prepared in this manner. During the process of application, the nationality of the person is required to be stated. There are many operators who handle tours as well as these processes. They will provide with the cheap visa hoping you would book tour from them. Money required for Vietnam visa US citizen It will cost some money to transfer the validity of the visa if it has expired. The residence cards of temporary nature would be costing different amounts, depending on the duration of the stay. Just as there are rules to be followed, there are also exceptions. For example people of countries such as Thailand, Malaysia, Singapore etc. do not require a visa if they would be staying for a month. The Vietnam visa requirements for US citizens are required to be fulfilled by all Americans visiting the country.