Please advice, half face card or swisspass flexi

Welcome Bakkutteh! If you're not dependent on hotel reservations, flights or other fixed dates, I suggest you change your itinerary. You'll save lots of traveling time and get better value of your rail pass if you plan your trip to Paris at the end, instead of getting there and back again from Switzerland. You could spend your first two days in Zurich, then get to Lucerne, Interlaken/Lauterbrunnen, Lausanne/Vevey, and leave for Paris from there without returning to Switzerland.

This would still be hectic, but if your main goal is to see as much of the country as possible, an itinerary like you proposed is fine of course.

Please find details on all transfers in the timetable.

As for a rail pass: that depends on your final travel scheme. Overall, I think you'll profit most from a 3 or 4 day Swiss Saver Flexi Pass. Plan your first and last free travel day for your first and last long transfer in Switzerland and pick other free travel days for the longest/most expensive trips in between, e.g. for the transfer Lauterbrunnen-Lausanne-Vevey. Details and prices for Singapore can be found here. If you want to be absolutely sure which pass is best, you should make calculations based on a detailed list of travel plans.

Hi Bakkuteh!

1) Well, only up to Geneva. The Swiss (Flexi) Pass is not valid in France.
2) That's an option too. If you want to use a pass on 4 consecutive days, you should take the regular 4 day Swiss Saver Pass, not the Swiss Saver Flexi Pass. Note that you'll have to buy additional tickets for all other trips on day 1, 6, 7, 8 and 9 in this case. Prices and information for Singapore are here.