British, Australian, Canadian, New Zealand, South African and USA passport holders are able to obtain a 30 day tourist visa upon arrival to Laos at major airports and border crossings including Wattay International Airport in Vientiane, Luang Prabang International Airport and at the Friendship Bridge if coming from Thailand.
At each of these entry points you must submit a visa application form (available on the spot) and two passport size photograph. The cost of the visa for the above nationalities ranges from USD30 - USD45. It is important that you have an entirely empty (stamp free) page in your passport and that your passport is valid for at least 6 months from your date of arrival.
If you are a passport holder of another nationality, check Project Visa for more information on visa requirements for Laos.