Late June trip

Hello Karel! Considering that the Jungfraujoch, Gornergrat (for the Matterhorn views) and Glacier Express are must-sees for you, you did a great job composing your itinerary. It would indeed be most logical to follow the order Zurich-Lucerne-Interlaken-Zermatt-St.Moritz-Zurich. You can do it the other way around as well of course, but that doesn't make much of a difference. I did notice that your travel scheme is quite full, but that's a matter of personal preference. If you want to see as much of the country as possible, this is great. If you want to be a bit more relaxed, you could also choose to skip Lucerne and travel onto Wengen directly. This will give you an extra day in the Bernese Oberland. On the other hand: Lucerne is beautiful too, so it's hard to make such a decision.

Some more tips:
- when visiting up at the Jungfraujoch, get down the other way via Grindelwald and return to Wengen via Grindelwald and Zweilütschinen. It's a bit longer, but the cog ride down to Grindelwald is great;
- when traveling from Wengen to Zermatt, take the route right through the mountains (via Kandersteg and Goppenstein) by regional train, instead of the quick tunnel connection. Again: it takes more time, but it's a much better experience with great views along the way.

I'm not sure if you already found the Swiss timetable, but it's very convenient for planning your Swiss trips.

Annika said: If you want to be a bit more relaxed, you could also choose to skip Lucerne and travel onto Wengen directly. This will give you an extra day in the Bernese Oberland.