TAP (Portuguese airline) is having a sale!
SFO to Zurich biz class midweek for less than $2000. There is a transfer at Lisbon but you can make it a stopover.
Dates: some in Feb and April, many in March
Use Google Flights to find exact dates
Bon voyage!
EDIT: this low fare also works for BCN and ORY.
Swiss Air is having a similar sale from SFO to ATH for about $2200. I really like their business class seats, lounges, and food.