Ok - have taken a look at some options for you.

Zurich-Detroit dept Fri Oct 16 10:10 via Toronto with Air Canada arriving Detroit Wayne County at 19:25
return Detroit-Zurich dept Tue Oct 27 14:40 via Toronto with Air Canada arriving Zurich at 08:05 next day
CHF 737 including taxes & fees

Zurich-Chicago dept Fri Oct 16 10:10 via Toronto with Air Canada arriving Chicago 15:15
return Chicago-Zurich dept Tue OCt 27 14:00 via Toronto with Air Canada arriving Zurich 08:05 next day
CHF 778 including taxes & fees

Zurich-Toronto only (on the same outbound and inbound flights) would be CHF 836 including taxes & fees - due to the vagaries of the pricing of airfares.

Note these fares are available now but may change higher or lower at any minute.

Bookable via this link - this link takes you direct to the flight booking page in English.