"In all 16 (from occupied Kashmir) and four returning (from Azad Kashmir) passengers crossed over to AJK," occupation army spokesman Vijay Batra told AFP.
Five people from occupied Kashmir stranded on the AJK by the October 8 quake also returned home, he said.
The crossing took place at Kaman Post, 117km north-west of occupied Srinagar.
The earthquake damaged the road along which the bus service ran as well as a bridge at Kaman named the "Peace Bridge".
The bus service was launched last April as part of a slow-moving peace process between Indian and Pakistan.
"The crossing marked the resumption of the stalled bus service," Batra said.
Buses drive passengers to the LoC where they cross on foot.
The last bus crossing took place October 6, two days before the earthquake.