There is a regular bus service from Kaliningrad with two lines running up to three services daily in each direction. Tickets cost around 600Rbls or approximately 10 Euros

From Gdansk			Bus nr. 249	To Gdansk
Dep.	Arr.	Duration		Dep.	Arr.	Duration
19:00	22:50	3:50	Kaliningrad	06:45	11:50	5:05
21:00	00:15	3:15	Kaliningrad (Fri, Sat, Sun)	16:45	20:50	4:05

 

From Gdansk			Bus nr 802	To Gdansk
Dep.	Arr.	Duration		Dep.	Arr.	Duration
06:00	09:30	3:30	Kaliningrad	06:30	10:30	4:00
15:00	18:30	3:30	Kaliningrad	07:30	11:30	4:30
17:00	20:30	3:30	Kaliningrad	15:00	19:10	4:10