Hello @Jessjess99
You can buy the tickets in advance which I recommend. You can check the prices including your subscriptions on your SwissPass card by entering the travel details on Connection | SBB. If you have for example a GA travelcard you'll pay from Wengen to Jungfraujoch and receive a discount up to 50%. On the Area validity it's written:
- GA, seven25 Travelcard and 1-month GA Travelcard: Reduced price
- Half Fare Card: Reduced price
- One-day travelpass for the Half Fare Card: Reduced price
- Municipal one-day travelpass, Saver Day Pass and special Day Pass: Without GA Travelcard or Half Fare Card the full price applies
For further information please contact our contact center by calling +41 (0)848 44 66 88 (CHF 0.08/Min.) or +41 51 225 78 00.
I wish you a pleasent week-end.
Kind regards, VlaznimA.