Go to Google Flights, pick some itineraries and select business class. You can receive email updates when prices change. If you have lots of time (i.e., several months) before your planned trip, start checking prices daily, beginning today. I have found business class tickets to Italy and Austria for $2,000-2,500 round trip during the past 2 years on United and Lufthansa, departing out of Newark, and typically with one connecting flight in Frankfurt. These were for trips in March, September and October, when ticket prices are lower than the summer. I also have seen some very good business class ticket prices from Philadelphia to Glasgow on American, but because my destination was Edinburgh and I don't like flying out of Philly, I opted to go on United from Dulles. But buy your tickets from the airline and not a third-party site, in the event a flight gets cancelled, etc. Also, make sure that the business class service actually has lie-flat seats - I think that Aer Lingus, which I was considering for my Edinburgh trip, did not. Overall, the business class experience (lie flat seats, excellent food, wine and more wine, priority check-in and boarding, access to airport lounges, etc.) makes the trip so much more enjoyable, while the ability to sleep on the plane (I can't sleep sitting up) is a huge advantage because you feel so much better when you arrive in Europe. But be forewarned - if you fly business class to Europe, you will never want to fly Economy ever again.