NORTHERN SERVICE FLIGHT COMPANY provides this services to tourists to Halong Bay.
Nomally they fly on Satuday morning and come back int eh afternoon BUT they won't fly if they don't have enough 20 people for their trip or your group got to pay for 20 tickets to ensure the flight will depart.
People who very keen on Flying to Halong bay often rent whole the charter for their trip, and it is considered too expensive.

Oneway US$5,750.00
Round trip US$ 8,000.00

The above rate does not include the transfer by car from your hotel to GiaLam Airport and from Landing place in Halong Bay to the boat station.
If you want it, please Contact Us for nessasary reservation.

Panorama view of Halong Bay