Swiss Travel Pass Flex
The Swiss Travel Pass Flex, like the consecutive passes, also comes in 1st or 2nd class, and is good for 3, 4, 8 or 15 individual days of free travel within Switzerland in a one month period. This makes it useful for a lot of people, such as when you have a 10-day trip to 2 or 3 different regions of Switzerland.
You choose the days that you will use for free travel, and write them into your pass yourself. The Swiss Travel Pass Flex will get you free travel between all cities and villages, on most city bus systems and lake boats, on the free travel days only. There are still a few trains that will require an additional seat reservation (like the Glacier Express, Bernina Express, and Chocolate train), and remember that almost all trains and cable cars going to points above the villages are privately run, and are not free, even on the free travel days. The Swiss Travel Pass Flex will give you 50% discounts on almost all of these mountain trains and cable cars.
The Jungfraujoch train has it’s own fare rules, and the Swiss Travel Pass Flex, on one of your free travel days, will give you free travel to Wengen or Grindelwald, 50% discounts from there to Kleine Scheidegg, and a 25% discount to the top.
The Swiss Travel Pass Flex also acts as a museum card, giving free (and occasionally reduced) entrance to most Swiss museums, but again, only on the 3, 4, 8 or 15 free travel days. This can be a nice perk, and you might plan to visit museums on the days that you are also traveling, but it can be a bit limiting as well.
By itself, the Flex gives you no discounts on the non-free days, but you can also buy this pass in combination with a Half Fare Card (the Half Fare Card is itself half-price if bought in combination with another pass), and I think in most instances this is worthwhile. The Half Fare Card is good for a month, and starts from the first day you validate your Swiss Travel Pass Flex. It simply gives you 50% discounts on almost any tickets you buy… point-to-point tickets, mountain top trains and cable cars, even 50% discounts to the top of Jungfraujoch. Most Swiss people buy annual half-fare cards, so half-price tickets are very common, and just one trip to Pilatus, Gornergrat, Jungfraujoch, or Schilthorn pretty much pays for the Half Fare Card combination.