Are there nonstop flights from St Louis (STL) to Seoul (ICN)?

No. The fastest connection is via Minneapolis, about 13h 39m of total flying time.

What is the fastest connection from St Louis (STL) to Seoul (ICN)?

via Minneapolis ≈ 13h 39m, via Chicago ≈ 13h 52m, via Seattle ≈ 14h 5m (estimated flying time, excluding layovers).

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

St. Louis Lambert International Airport (STL) to Incheon International Airport (ICN)・10,740 km

No nonstop flights. The fastest connection is via Minneapolis (MSP), about 13h 39m of flying time (layover not included).

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

None.

17 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.