The best price found from United States to Northern Thailand is on January 14th, 2017, travelling with Etihad Airways. See more options, compare prices and book: search flights.
For those in a hurry, northern Thailand’s air links are surprisingly good. At research time, Nok Air, a subsidiary of THAI, had the most expansive network, with flights connecting several provincial capitals in the region with Bangkok or Chiang Mai. Other domestic airlines that cover the north include: