When does the 825 bus to Nong Khai leave the Survarnabhumi (Bangkok) airport?

The bus to Nong Khai. Bus number 825 leaves at 06:00 and 22:30 from Suvarnabhumi airport to Saraburi - Nakhon Ratchasima - Kon Kaen - Udon Thani - Nong Khai.