The nearest airport is OSL - Oslo Gardermoen, located 79.6 km east of Gren.
Other airports nearby include VDB - Fagernes Leirin (96.8 km north), SKE - Skien Geiteryggen (109.5 km south), TRF - Torp (114.2 km south), KRS - Kristiansand Kjevik (236.5 km south west),