how much is Schilthorn w/B-O pass and 1/2 fare card?

You should wait until you get there to buy your ticket either the night before or the day of; that's the best practice. The ticket offices open at 7am. Otherwise you risk going all the way up on a day when the weather is lousy with zero visibility.

The discount on the Schilthorn is 50% no matter which pass you have. Just choose the “Half Fare Card” discount when you buy your tickets in the app. You cannot combine the two and get 100%; it is one or the other.

The prices on the Jungfrau trip are different with the two passes because they kick in at different places. The BO Pass discount applies from Eigergletscher, while the HFC discount applies from Kleine Scheidegg. And the BO Pass discount is called a “special price”; not 50%. You can see the difference if you enlarge the BO validity map to look closely at this area, and look at the little “B” on the map key. The price difference if you have both is because your BO Pass fully covers up to Eigergletscher, and the Half Fare Card 50% applies from there.

https://www.berneseoberlandpass.ch/assets/Uploads/Geltungsbereich-Berner-Oberland-Pass-2024.pdf

I would indeed just buy the Schilthorn ticket at the ticket office. But you do not have to wait till you are in Mürren. The ticket office of the station where you start your trip can do it for you.

WengenK, can you buy it on the app the night before or over breakfast, once you have check the weather conditions.

I'd much rather use the app than line up at a station.

There is never really a line to get tickets in Murren at the Schilthornbahn. There are multiple machines you can purchase from there or a desk with an English speaking human. It's a simple, quick process.