Hurtigruten has a Northern Lights promise

The guarantee is open to North Americans booking a 12-day 'Classic Round Trip Voyage' for departure between October 2015 and February 2016 inclusive. Staff on board Hurtigruten’s 11 coastal ships will be scouring the night skies and will announce any sightings of the lights to all passengers.

Occurrences can last anywhere from a few minutes to hours. However, if the Northern Lights don’t appear during the voyage, Hurtigruten will offer travelers the choice of a free seven-day 'Classic Voyage North,' or a six-day 'Classic Voyage South' departing between October 2016 and March 2017.