Norwegian is cancelling 22 flights between Europe and the US as a result in reduced demand, which the airline has blamed on coronavirus.
The routes include London-New York, which will reduce from three daily departures to two on some days.
The others all affect services to and from Rome, with a reduced number of departures on Rome to Los Angeles, Boston and New York during selected weeks.
The cancellations will be effective from March 28-May 5 and affected customers will be contacted by Norwegian and offered a new itinerary.
The airline said: "Norwegian has during the past few days experienced reduced demand on some routes, particularly on future bookings.
"Bookings for flights departing in the coming weeks are less affected.
"Norwegian has a limited number of flights to Northern Italy and other regions heavily affected by the virus. In addition, the company has a higher share of leisure traffic, which seem less affected than business traffic."
Last month, the company announced it was reducing capacity by up to 15% in 2020.
"Norwegian is monitoring the developments closely and is continuously evaluating additional changes to its schedule," it added.
