From the lovely destination of Chiang you can reach Bangkok by air. It will take around an hour to reach Bangkok from Chiang Mai. There are budget carriers and inexpensive domestic flights and you can board them Chiang Mai International Airport which is located at the heart of the city. There are more than 30 flights in between Chiang Mai and Bangkok. You can book tickets in Bangkok Airways, AirAsia, Thai Airways and Nok Air. The airport at Chiang Mai is centrally located and you can reach it via public bus or taxi. A taxi will cost you approximately 150 bahts.

Apart from flights, you can also opt for the overnight sleeper trains. You will get a feel of Thailand as you board the train. Interacting with the locals will help you to get a fair idea about the place.
In fact the overnight train is a comfortable option and while leisurely traveling by train you can enjoy the scenic landscape. The overnight train, also known as the Rapid Train, departs the Chiang Mai station around 9 pm and takes around 12 hours to reach Bangkok. However you can check the schedules before boarding the train as there are last minute cancellations. Traveling by train is a slow yet an enjoyable journey. There are comfortable bunks and if you get a ticket for the second class, you can take the bottom bunk. You need not worry about the food and drinks as you can have them both in reasonable prices onboard.

A bus journey from Chiang Mai to Bangkok will be definitely interesting. Buses depart at regular intervals and it takes approximately 10 hours to reach Bangkok from Chiang Mai. You can board the buses from Arcade buses station which is located at the eastern end of Kaew Nawarat Road.  There are VIP buses and though the fares for these buses are slightly higher, yet they would be a better choice. The fare is somewhere around 400 bahts to 600 bahts. It is better to take warm clothes as the air conditioning can be freezing and if you want to save your ears from assault from noisy videos, it is better to take ear plugs.

Car can be a luxurious option as you can travel in your own leisure and stop at Sukothai or Ayutthaya while traveling towards Bangkok from Chiang Mai. As you enter the mountainous region near Phitsanulok or Tak, you can experience the splendor of the Thai countryside and the sweeping view will be etched in your memory forever. If you do not stop often admiring the beauty, it will take less than seven hours to reach your destination. Although roads are good, you should be still careful to avoid accidents.