Sorry, Songkran price hike was a computer glitch

For flight between Bangkok and Sakon Nakhon no tickets were sold at the higher price of over 14,000฿ posted on their website according to AIR ASIA.

Flights from 10 to 12 April are sold out. Keep in mind airlines raise their rates when there is a higher demand. Therefore it may be beneficial to travel early and stay a few extra days till rates decrease

Additional Reading: It was a glitch: AirAsia explains price hike on Songkran flights | Thaigerสกลนคร Sakon Nakhon