Why Choose Quang Dung?

Onboard toilet: no waiting for the next rest stop — the single biggest comfort difference on a long Vietnamese coach ride.
Private 22-cabin layout: each passenger has a curtained cabin with a reclining berth, USB charging and blanket.
Afternoon departure: spend the morning in Hanoi, leave at 15:00 or 15:35 and arrive before midnight rather than at dawn.
Established operator: Quang Dung runs a large fleet of cabin and sleeper coaches on routes across Vietnam.

Itinerary

Total travel time: approximately 8 hours

15:00 or 15:35 departure from Hanoi — check in 30 minutes before; the exact boarding point is on your confirmation.
South on the North–South Expressway past Ninh Binh, Thanh Hoa and Vinh, with rest stops for food and toilets roughly every 3–4 hours.
Arrival around 23:00–23:35 in Phong Nha village (Son Trach), on the main road near the Phong Nha Cave boat station and most guesthouses.

Note:

Arriving close to midnight — tell your guesthouse your bus time so someone is there to let you in.