To obtain a visa approval letter for a visa on arrival at approved Vietnam's international ports, there are generally two main steps. The visa approval letter, also known as the pre-entry approval letter, is not a full visa but is required before any foreign expatriates get a visa stamped and come to Vietnam. This legal document, approved by the Vietnam Immigration Department, allows foreign travelers to get a visa on arrival in a convenient and timely manner. Depending on the purpose of entry, visa validity, and nationality, processing times for the visa approval letter can vary about 5 working days. This method is particularly useful for foreigners who want to go to Vietnam for different purposes but having a company to act as a sponsored entity and well arrange for the application. For now, it would be generally 04 steps for a sponsored company has not yet have Public Service Portal Account (Ministry of Public) and 03 steps if the sponsored company already had the mentioned account. In this article, Visa5s.com will provide an overview of how to apply for a Vietnam visa approval letter on arrival.