three Indian ways to get there.
Shared autos will take somewhat around 1 hour to reach there and they will not start until it is full.
Buses you can catch from Amritsar Bus stand and there you must reach a bit early - 45 min drive + 30 min wait in bus.
Private cabs are costlier, on which I traveled took 10 INR/km and it was around 40 km.
The ceremony starts about 5:15PM and you have to be there 15 min early to get a seat and at least an hour early to get front rows.
You have to add 10 min of walk from parking to ceremony place, so plan accordingly.