There’s a newcomer on the scene, Vietjet Air. I’d strongly recommend against using them. Although they have 6 flights a day on this route, they usually combine them to fill planes, and only run a few per day. Both of my Vietjet Air flights were cancelled, and I was moved onto one of the later flights. On the way there, it was only an hour delay. But on the way back it was a 5 hour delay. Definitely not worth the $5 savings. With any of these airlines, though, expect some delays and don’t schedule tight transfers.