The best price found from United States to Udon Thani is on January 14th, 2017, travelling with . See more options, compare prices and book: search flights.
Thai Airways connects Udon Thani to Bangkok (from 1400B) through Suvarnabhumi airport four times daily, while Nok Air (from 1100B) and Air Asia (from 1000B) use Don Muang Airport four and two times daily respectively. Air Asia also has a daily direct flight to Phuket (4000B) and Nok Air goes daily direct to Chiang Mai (1800B).
Buy tickets at On Time, one of several travel agencies near Bus Terminal 1.