Are there nonstop flights from Washington (DCA) to Seoul (ICN)?

No. The fastest connection is via Toronto, about 14h 10m of total flying time.

What is the fastest connection from Washington (DCA) to Seoul (ICN)?

via Toronto ≈ 14h 10m, via Detroit ≈ 14h 18m, via Montréal ≈ 14h 21m (estimated flying time, excluding layovers).

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

Ronald Reagan Washington National Airport (DCA) to Incheon International Airport (ICN)・11,195 km

No nonstop flights. The fastest connection is via Toronto (YYZ), about 14h 10m of flying time (layover not included).

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

None.

15 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.