The train station for Son is called Sonsveien.
The train correspond with the bus (931 and 932) to Son centre. The airport bus F11 take you directly to Sonsveien from Oslo Airport Gardemoen. Rygge Airport do you reach with taxi.
The nearest airports are
Rygge Airport, approximately 20 minutes by car
Oslo Airport Gardemoen, approximately 1 hour by bus
Torp Airport, approximately 1.5 hours by car
By car the easiest access to Son from Oslo, Moss and Sweden is by the E6 motorway.
Here: Travel to Son