Right now, August/2020 is the cheapest time of year to take a flight to Incheon.
Qantas Airways, Asiana Airlines, Korean Air and Jetstar fly direct to Incheon from Australia.
Singapore Airlines is the cheapest airline that flies from Australia to Incheon.
The best airline to fly to Incheon from Australia is Qatar Airways. Qantas Airways is the best if you want direct flights. AirAsia X is the best low-cost airline.