The booking bonus applies to all sailings throughout the remainder of 2024 and 2025
A parallel offer saves guests up to £650 per person on select balcony cabin bookings.
Mario Bounas, Swan Hellenic's general manager for the UK & Ireland, said, "This time of year is rich in opportunities, with everyone just back from their holidays and dreaming of getting away again.
"We aim to help those dreams come true with these unbeatable offers that enable our cruise guests and travel agent partners to save and gain alike. And we’re here to help our trade partners make the most of them between now and mid-October when both offers end."
Five new Svalbard Explored cultural expedition cruises have been added to the 2025 schedule after the itinerary sold out in 2024. The cultural itineraries blend an in-depth Arctic sailing with a pre-cruise overnight in Copenhagen.
Antarctica bookings are not included in the £100 incentive, which runs until mid-October.
