Dec 21, 2016 - 10:26 AM
Your price from Chf 52,00 is only one way ticket half fare from Interlaken to Jungfraujoch
It is not posible to walk back from Jungfraujoch to Interlaken, so you must always buy a return ticket.
The price for a returnticket Interlaken>Jungfraujoch>Interlaken is Chf 210,00, with Half-Fare-Pass it is Chf 105,00 for one adult.