Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 7
Distraction; Workload; Communication Breakdown
Conflict Airborne Conflict
Air Traffic Control Provided Assistance; Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance
Human Factors; Procedure; Chart Or Publication; Airspace Structure
Aircraft X was 12 miles Northwest of ZZZ on a base heading 220 at 3;000 feet being vectored to the ILS Runway XXR at ZZZ airport. I observed an unidentified VFR target depart ZZZ1 airport climbing out of 1;700 feet southbound. At first the the target was flying away from Aircraft X but then I observed the target start a a turn to the east. I then assigned Aircraft X heading 250 anticipating the VFR target would make a turn to the north east to avoid the immediate incursion into the ZZZ Class C airspace. This caused Aircraft X to go through the final for Runway XXR and I climbed Aircraft X to 3;100 feet because the new projected flight path would be into a higher Minimum Vectoring Altitude. I then anticipated the VFR target would turn east bound once it got north of the Class C. So I took Aircraft Y off the arrival who was 10 miles north west of the airport on the downwind. I stopped his descent at 5;000 feet when I would normally descend aircraft at this phase of flight to 3;000 feet. It then became apparent the altitude adjustment wasn't going to be enough so I turned Aircraft Y to a 220 heading. The VFR target did make a turn to the east once north of the Class C climbing opposite direction into our arrival corridor at ZZZ. The VFR target did eventually contact another controller for an IFR pickup in my airspace.This event only had a positive outcome because this happens so frequently I have become overly cautious and I guessed correctly what the non participating aircraft was going to do every step of the way. I could have easily guessed wrong and could have had a dangerous situation develop into a crash. I recommend an airspace change that would extend controlled airspace over ZZZ1.
A TRACON Controller reported they vectored two aircraft off the final approach course to avoid an unidentified VFR aircraft which departed an airport underneath the final approach course. The reporter states this conflict occurs frequently and recommends extending controlled airspace to prevent further occurrences.