KLMUK and partner Alitalia have rolled out a range of joint-UK winter fares as part of their new global alliance.
The fares are also aimed at boosting bookings from London to mainland European destinations after increasing competition from low-cost airlines.
Prices lead in at £119 return to Milan, Venice, Rome, Bologna and Turin. Return fares from £139 to Barcelona, Lisbon, Madrid, Nice and Toulouse are also available.
Flights are from either Heathrow or Gatwick, or Stansted for Turin services. They will be operated by Alitalia, KLM UK or KLM.
Passengers may have to change at the carriers’ hubs of Amsterdam, Milan or Rome to reach their final destination.
Bookings must be made by December 4 for travel between January 15 and March 31.
KLM itself will increase competition on UK-mainland Europe routes when it launches flights with its own no-frills carrier Buzz from Stansted in January.