There are no paved runways in Antarctica. Airplanes land on skis, not wheels, on runways of ice.
There are no commercial airports in Antarctica. Most science stations, however, have ice runways nearby, so that airplanes servicing the station can land on skis.
Vietnam has four runways
there are 5 runways.
There are no airports in Antarctica. Airplanes land and take off from ice runways, and are met with transportation vehicles to move cargo and people to and from the research facility to the airplanes.
Honolulu International Airport has six runways.
7
There are no tarmac runways in Antarctica: all runways are ice. Pilots slow the airplanes down to their minimum airspeed in order to maintain lift, and essentially glide or drift slowly onto the ice runways when they land. Note as well, that some airplanes are equipped with skis instead of wheels. All airplanes are non-commercial and are military grade craft, flown by pilots experienced in landing in extraordinary situations.
There are no airports in Antarctica. Logistical flights carried out by government military operations can land on ice runways during some periods of the year. There are no commercial flights that land anywhere on the Antarctic continent.
Changi Airport has two parallel runways, 02L/20R and 02C/20C.
3.
It varies according to demand.
If you mean runways, there are three.