Thai Airways International (TG), Orient Thai Airlines and Air Asia operate daily flights between Bangkok and Chiang Rai. The flight takes about 1.15 hrs.
There are both air-conditioned and non-aircon bus services from Bangkok's Northern Bus Terminal on Kamphaengphet 2 Road. The journey takes about 11 hrs.
For further details,
call the Northern Bus Terminal, 0 2936 2852-66, 0 2936 3666
Take Highway No. 1 (Phahonyothin Road), turn to No. 32 passing Ayutthaya, Angthong, Singburi, change to No. 11 passing Phitsanulok, Uttaradit, Phrae, then turn left to Highway No. 103, drive on until passing Ngao district and turn right to Highway No. 1 which takes you to Phayao and then to Chiang Rai. The whole distance is 785 km.
There is no direct train to Chiang Rai. You have to take a train to Lampang
(9 hrs. from Bangkok) or Chiang Mai (11 hrs.) and then take a bus to Chaing Rai. (2 hrs. from Lampang and 1.30 hrs. from Chiang Mai)