Costs
Laos is an inexpensive country to visit by almost any standards. Not including transport, a budget of US$15 a day brings with it decent food and comfortable, but basic, accommodation. When you add air-con, hot water and falang (Western) food, costs are around US$20 to US$25 per day if you economise, and around US$75 for top-end hotels and food. Of course, you can spend even more if you stay in the best hotels and eat at the most expensive restaurants, although such a scenario exists only in Vientiane and Luang Prabang.
Read more: http://www.lonelyplanet.com/laos/practical-information/money-costs#ixzz2sissxiLk