Norwegian will suspend its transatlantic routes from Shannon, Cork and Edinburgh to Rhode Island's Providence airport this winter.
Citing "lower demand", the Scandinavian carrier says the routes will be halted in October.
"We will continue to assess our transatlantic route performance as we confirm the route schedule for next summer," adds Norwegian.
It started flights to Providence from Cork in June 2017 and from Edinburgh and Shannon the following month.
The three services are operated with Boeing 737 Max jets and represent some of the first long-haul routes on which the carrier deployed narrowbodies.
Norwegian says it is "too early to say" how the changes will impact on its 737 Max base at Providence's TF Green airport.
FlightGlobal schedules data shows no other airline currently operating on those routes.
Norwegian suspended services between Hartford and Edinburgh in March, citing the impact of the UK's air passenger duty.
Source: Cirium Dashboard