Need advise on Passes for 6 day trip

Hi Brian! Your itinerary seems to have changed a bit compared to the one you mentioned in this topic. However, differences are not that big and I still think a Swiss Half Fare Card would be best. When ordering your Swiss Half Fare Card online through STC, you'll have to specify the start date of your pass. Just follow the steps in the order procedure and enter September 19 as your start date. From that day on, your pass will be valid during an entire month. You only need the first six days of your stay, but that's no problem.

I'd say Interlaken-Lugano and back is too long for a day trip - I assume you mean Interlaken-Lugano and not Lucerne-Lugano, as you mention this plan for day 4 during your stay in Interlaken, right?. Lucerne-Lugano would be a better option, but still a bit too much for one day in my opinion. Traveling times can be found in the online timetable. A single trip Interlaken-Lugano takes at least 4 hours, so you won't manage to visit Lugano and return the same day. If you want to visit the southern side of the country in case weather is better over there, consider a trip to Brig and its surroundings instead. Getting there takes about an hour from Interlaken. You could even manage to visit Zermatt or Saas-Fee and return the same afternoon or evening, although that would be a long day as well.