The best airport to fly in to for this trip will be Munich (MUC). We have found great deals on flights from many airports across the U.S. that fly in to this city and think it won't be too difficult to find good flights for everyone.
Our current plan is to fly in on Thursday, December 10th, and would like to meet everyone in Munich before traveling to the wedding location on Friday the 11th or Saturday the 12th ( it is a short, beautiful train ride away and we would like to have everyone travel together for this leg of the trip ).
Flights are not on sale yet for winter of next year so we do not have specific details or prices at this time but will keep everyone informed as we are able to start booking. If we get multiple people flying out of the same airport, it is possible that we will be able to work with an airline or travel agency to receive a group discount.
Based on this year's rates, we are expecting roundtrip travel to cost between $475 & $750 per person but have seen cheaper tickets from many of the international hubs like Houston, Atlanta, New York, Chicago, & Miami.
You will also of course have the option of flying in or out of a different European city if you would like to explore further or find a means of travel that better suits your plans.