https://promo.united.com/offers/europemultiplier"Earn up to 50,000 bonus miles for flights to London, Amsterdam and Paris!
Reward your spontaneous side when you book a trip to Europe this winter and earn 5x more MileagePlus® miles on every flight.
Simply register for this promotion and receive bonus award miles equal to 5x the fare on qualifying flights* when you book and fly in United Economy® between the U.S. and London (LHR), Amsterdam (AMS) or Paris (CDG) before December 13, 2023."
ETA: Connections through these cities are also eligible. Basic Economy is not eligible.
