Due to the pandemic I have left ZRH several months at a whim, and thus could not deregister. I just found out I could do so online, I have sent them an email but they are asking for flight details and etc. I am trying to find flight details, but it seems I may have lost the ticket.

I thus ask you: what is the consequence for no deregistering? I was only a student, so I have never worked or anything. Deregistering is so cumbersome that I am almost giving up. My residence permit is expiring anyways.

To make it clear: I have no utilities, nothing to cancel, do not pay health insurance or anything else.

Where did you leave to? No one has a physical flight ticket anymore. Is the booking not in your email?

If not just email them back and tell them you no longer have the booking and please could they deregister you as you are no longer in Switzerland. Explain you have nothing to cancel so it is for their records.

The only problem I could see is if you want to come back it might be an issue! Depends if you’re Eu or non EU.

If you don’t have your ticket just tell them the name the ticket was booked in, the destination and the date of the flight. If need be they can get the ticket details, and confirmation that you travelled.

Did you get a stamp in your passport when you arrived wherever? That too would help.

Contact the airline and ask them to resend you ticket details / booking email.

Proving how you left the country is only the first step. Normally they won´t let you deregister until you can prove that your taxes are paid up and doing that from a foreign residence is a nightmare.

As a student it’s unlikely they have any tax to pay. Also any tax would have been taken as Quellensteuer.

Correct, I missed that.

I do have the flight reservation email, but not the actual tickets, as for those I have used easyJet app.
I am not eu citizen, but moved to an Eu country.

So send them the booking email, tell them that’s all you have.... unless you still have boarding passes on your phone, then you could take screen shots too!

Easy jet just do confirmation, no actual tickets. Boarding pass can be printed if you saved it on your phone or received by email.

Do you have something from your new location that proves you're registered there? That might help.

If you're non-EU I think it's best to find a way to deregister. That way the Swiss authorities can't later come back and say you overstayed your time and are not allowed to return.

Sounds like a story from "Border Force" TV show that I'm watching right this minute. Sounds like the OP doesn't want anyone to know where he/she has gone.

I would simply not take the risk of "not deregistering". It's more hassle to do it later and there is a penalty fee if you wait too long Right now the date you left and whatever email you have should be more than enough. If they complain, reach out to the local embassy of Switzerland.

I have deregistered, thanks.