Are there nonstop flights from Detroit (DTW) to Seoul (ICN)?

Yes. Delta Air Lines fly this route. Flight time is about 13h 2m.

What is the fastest connection from Detroit (DTW) to Seoul (ICN)?

via Minneapolis ≈ 13h 48m, via Chicago ≈ 13h 50m, via Toronto ≈ 13h 53m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Detroit Metropolitan Wayne County Airport (DTW) to Incheon International Airport (ICN)・10,654 km

Nonstop flights available (1 airline). Flight time about 13h 2m. Nonstop return flights also operate.

With milesANA 30,000 miles+ (via EWR)JAL 45,000 miles+ (via SEA)Economy, one way, estimate. Tap a connection for miles by cabin.

29 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.