A valid passport and Vietnamese visa or visa exemption document are required. A visa or visa exemption document must be obtained from a Vietnamese Embassy or Consulate prior to traveling to Vietnam; entry visas are not available upon arrival. Americans arriving without an appropriate Vietnamese visa or exemption document will not be permitted to enter, and will be subject to immediate deportation. Vietnamese visas are usually valid for only one entry. Persons planning to leave Vietnam and re-enter from another country should be sure to obtain a visa allowing multiple entries. U.S. citizens wishing to travel to Laos by a land route should obtain the type of Vietnamese visa that adheres to the passport. Detachable visas are removed by Vietnamese immigration authorities upon departure, thereby eliminating any documentation of leaving Vietnam, which is required by Laos immigration for entry. This situation can result in the traveler being returned to Vietnam.
Please note that non-U.S. passport holders are responsible for obtaining the required documentation applicable for their entry.