Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
ATC Issue All Types; Conflict NMAC
Flight Crew Took Evasive Action
Procedure; Human Factors
We were in cruise 3 miles north of the shoreline near TJAB airport. We usually stay north of the shoreline due to parachute activity at TJAB going to and from TJSJ and ZZZZ. We normally get advisories of jumping activity and we tell them we are staying north or San Juan Center gives us direction to stay away from the area. Today; we were at 4;500 feet MSL in cruise 3 miles north of the shore heading west bound. We had flight following from TJSJ in route to ZZZZ. We were on with San Juan Departure at 119.4. We heard a King Air at 10;000 feet reporting jumper away at the same time we were passing by. I was looking out my window to see if we could see them. No visual contact. We did not get any traffic advisories from ATC. Suddenly; I spotted the King Air at my 7 to 8 o'clock about 500 feet above me heading right for me but in a turn back to the coast line. I was close enough to see the tail number. I took immediate action and turned right to give us some space. I do not believe the King Air saw us as his belly was mostly pointing to us. A few moments later; ATC switched us over to San Juan Center at 118.75. We did not mention it over the frequency; but some of our passengers noticed how close the plane was. It was VFR; however; this plane was also on frequency and squawking a code and no advisories from them. We were extremely close. The flight ended in safety but wanted to file a report anyway. Lack of advisories from ATC. Luckily we were watching for it or something might have happened.
Air taxi Captain reported an NMAC with a King Air in the vicinity of TJAB airport.