Both destinations are served by Coimbatore (CJB). Since there's no flight route between them, the best way to travel is by road.
Kanthalloor
Fly to Coimbatore (CJB), then travel by road to Kanthalloor. Taxis, buses, and private cabs are available from the airport.
Coimbatore
Fly to Peelamedu (CJB), then travel by road to Coimbatore. Local transport options include taxis, auto-rickshaws, and state buses.