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