Bus travel from Vareena, Italy to St. Moritz

You could change locations to Colico Piano at the top of the Lake Como. You can get a train there to Chiavenna at 5:45 am, arriving at 6:17 am. Breakfast there, then a Postbus at 7:10 am that gets to St Moritz at 8:42 am. That way, you could get the earlier Glacier Express at 9:15 am.

I have seen your other posts. I believe you are trying to cram way, way too much travel into a single day for the sake or two named trains. Please beware road trip on this route is subject to frequent delays. Do not count on the bus being on time like the trains.

After having read this and your other posts, the two things to say are:

1) Spell it correctly Varenna

2) Look it up on the SBB website: https://www.sbb.ch/en That has all trains and buses in Switzerland, and all trains in surrounding countries.
If you type in "Varenna-Esino" to "St Moritz", a date (I picked a random date in April), and a time (05:00), it showsthe first option of the day as:

Varenna-Esino dep 07:26, Bus 5254A, Colico arr 07:55
Colico dep 08:10, Train, Chiavenna arr 08:35
Chiavenna, Stazione dep 09:06, Bus 4, St. Moritz, Bahnhof arr 10:42

Which I don't think is early enough. And you miss the Bernina Route going that way, which is in my opinion superior to The Glacier Express route.

I think the OP has moved on from this question, Chris. Check other questions.