From there, your only option is to go via Chiang Mai. At the Northern Terminal (Mohchit Mai), a wide range of buses heading to Chiang Mai are waiting for you to fit your schedule and budget. These buses run around the clock with prices between 500 Baht and 700 Baht for the whole 9-hour journey.
The fastest, but not the cheapest way to get to Chiang Mai from Bangkok, is to fly. There are several airlines that operate on this route. Among them, Nok Air, Bangkok Airway, Air Asia and Thai Airways are the frequent flyers.
From Chiang Mai, you are now only a couple of breaths away from Pai. Again, you are faced with several options for travel.
If you prefer cruising through lush green scenery and drinking in the scenery, there are local buses, the 14-seater minibus, and the open air Song Taew (two-rowed mini vans) to meet your demand.