Book cheap flights to Kangaroo Island online now. Use Webjet's deal finder to compare cheap airfares to Kangaroo Island across leading airlines. Getting here is easy by ferry from Cape Jervis or a 30 minute flight from Adelaide Airport. If you're not flying to Kangaroo Island, you'll be taking the ferry. Flights to Kangaroo Island starting at $ from airlines such as American Airlines, Delta, United, JetBlue, Frontier, and more. Expedia Price Guaranteed!.