Are there nonstop flights from Seoul (ICN) to New York (LGA)?

No. The fastest connection is via Montréal, about 14h 3m of total flying time.

What is the fastest connection from Seoul (ICN) to New York (LGA)?

via Montréal ≈ 14h 3m, via Toronto ≈ 14h 9m, via Boston ≈ 14h 15m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 47,000 JAL miles (economy, one way, based on the published award charts).

Incheon International Airport (ICN) to LaGuardia Airport (LGA)・11,072 km

No nonstop flights. The fastest connection is via Montréal (YUL), about 14h 3m of flying time (layover not included).

With milesANA 30,000 miles+ (via YUL)JAL 47,000 miles+ (via DFW)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

11 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.