Norwegian is expanding its short-haul network from Gatwick by adding flights to Berlin and Warsaw.
The low fares carrier will run six flights a week to both cities from September 15.
The number of departures to Copenhagen will also rise from four to five a day.
Fares for the new routes start at £29.90 one way to Berlin (Schönefeld) and £34.90 to Warsaw.
The airline claimed a 10% share of all flights from Gatwick in the first quarter of the year with 375 flights a week on 33 routes.