Are there nonstop flights from Reykjavík (KEF) to New York (LGA)?

No. The fastest connection is via Boston, about 5h 55m of total flying time.

What is the fastest connection from Reykjavík (KEF) to New York (LGA)?

via Boston ≈ 5h 55m, via Montréal ≈ 6h, via Toronto ≈ 6h 34m (estimated flying time, excluding layovers).

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

Keflavik International Airport (KEF) to LaGuardia Airport (LGA)・4,155 km

No nonstop flights. The fastest connection is via Boston (BOS), about 5h 55m of flying time (layover not included).

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

None.

14 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.