Domestic flights DMK, international flights BKK.
I've never had to wait so long for immigration when returning to Thailand like I did at DMK.
Arrived on a flight from Vietnam at DMK around 3pm. Spent 2 hours waiting to clear the immigration, then had to wait 30 or so minutes for the bags to arrive.
We were flying VietJet Thailand. At BKK the longest queue that I had arriving from overseas was probably 45 minutes wait, and the bags always came fast.
As for the domestic flights. DMK was much faster comparing to BKK.
Regardless. I miss Thailand so much. Hoping to get there in October of this year.