Are there nonstop flights from Cairns (CNS) to Seoul (ICN)?

No. The fastest connection is via Osaka, about 8h 51m of total flying time.

What is the fastest connection from Cairns (CNS) to Seoul (ICN)?

via Osaka ≈ 8h 51m, via Tokyo ≈ 9h 24m, via Bali (Denpasar) ≈ 11h 14m (estimated flying time, excluding layovers).

from 27,500 ANA miles (economy, one way, based on the published award charts).

Cairns International Airport (CNS) to Incheon International Airport (ICN)・6,372 km

No nonstop flights. The fastest connection is via Osaka (KIX), about 8h 51m of flying time (layover not included).

With milesANA 27,500 miles+ (via SIN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

6 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.