Just posting for people's information. I just recently flew from Santiago airport to Arica via skyline chile. I chose this path due to the 4 hrs on a plane compared to the 14hrs plus on a bus. When we reached Arica airport we got a taxi to drive both my wife and I to tacna for 35,000 Chilean pesos for both of us. There is no cambis. And taxis are very new Hyundai's. We reached the border within 15 min and the taxi helped us with the crossing. Overall very smooth transition. Hope this helps anyone.