As for nonstop flights from the United States to Reykjavik, there are several options available. Several airlines offer direct flights from various U.S. cities to Keflavík International Airport, making it convenient for travellers. Some of the cities with nonstop flights to Reykjavik from the United States include:
New York (JFK and Newark)
Boston
Washington D.C. (Dulles)
Seattle
Chicago
Denver
San Francisco
Los Angeles