Transportation from Helmhaus Hotel/Zurich to Zurich Airport

You can find out the train schedules on www.sbb.ch
Just enter the street address of your hotel in the from box, and the airport in the destination box, and you will be given detailed instructions.
For a 7 flight to London I would aim to be at the airport at 6 a the latest.

I was curious what the timetables were for some fall travel and found the website in German. You probably have come to this conclusion already. I accessed the same website and replaced the "de" with "en". This Also provided the timetables.

to take the train would involve getting to the station, and that looks like about a 15 minute walk or 8 to 10 minutes on a tram plus waiting time.

with 5 in the family, maybe some small, plus 5 people's luggage for a 7am flight I'd be asking the hotel to arrange a car or taxi which can be waiting when you're ready to go...

Thanks, everyone. I think getting a taxi or car service will make the most sense for us.