Irish police say nothing suspicious has been found following a search of the Boeing 767, and none of the 206 passengers and crew on board has been reported injured.
Monday's flight was bound from Istanbul, Turkey, to New York's John F. Kennedy Airport.
The Dublin Airport Authority and the Irish Aviation Authority say the pilot requested an emergency landing because of a suspicious object found on board. The aircraft later was cleared for refueling and resumed flight to New York.
Authorities say no other flights at Dublin Airport were affected by Monday's security alert