https://goo.gl/flights/yYsQ

Quite a bit of availability in the coming months by the looks of it.

LCY - FRA with LH
FRA - EWR with UA

EWR - ZRH with SR
ZHR - LCY with LCY

Layover in ZHR seems a bit long, but lounge access should make this bearable.

Good deals in Economy available as well.

Couldn't determine booking class. Sorry! But should get some good mileage as well.