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Hi Stephy,
The Regular price from Wilderswil to Jungfraujoch is 103.20chf one-way (The SBB timetable gives you the “From price” which is 50% off for Swiss Half Fare Card holders. You need to click red box listing the price and enter your details and select no discount to find the regular cost.
For Swiss Travel Pass or Swiss Travel Pass Flex (same coverage/discounts) holders you get free travel as far as Grindelwald or Wengen (depending on your route) and from there you get 25% off the regular ticket cost of 95chf to Jungfraujoch — all prices noted above are for one-way travel.
Prices are listed here. Click the link under “more information” for a PDF. You can buy the tickets at Wilderswil on the day of travel without issue (be sure the weather looks good!)
For Murren to Wilderswil the timetable gives you the quickest option by default: Mürren to Grütschalp by train then a cable car to Lauterbrunnen and then a train to Wilderswil. About 50 minutes total travel time.