Business class Western Europe to Miami from 1305€, this route will be operated with TAP's new A330-900neo in lieflat seats.
Oneway tickets also available between 590€-730€, depending on the airport you fly from. A free stopover is also included in Lisbon if you like.
Flights are available the whole year, availability is the best when you look for dates well in advance, but of course not every single date will be available.
TAP is flying to many other destinations in North America for similar prices, not to all destinations with their new A330-900neo.
If you want to know how TAP's new business class on the A330-900neo looks like, you may check out this video.