Extending your visa will mean you will be able to stay longer in Vietnam without leaving. The duration of allowed extension will depend on the visa you have already obtained. If you wish to extend your visa for a period of one month, your current visa must be one for a month or longer. The fee will be approximately US$60 – US$155, depending on your nationality.
If you wish to extend your visa for a period of three months, then your current visa must be one for a three-month long stay. The fee will be approximately US$180 – US$310, depending on your nationality.
Many agencies can help you deal with this process. This can also be done directly at the Immigration Department. Along with your application you must submit copies of your passport bio page, current visa, immigration stamp, last date of entry, port of entry and details of your current accommodation(s) in Vietnam. Extension will take around five to seven working days.
Note: Only a limited number of nationalities are eligible to apply for an extension, and the requirements change accordingly as well. Contact the Immigration Department in advance and ask.