We'll be traveling this year at the end of April through the first week in May. Newark is the closest airport but I'd like recommendations on the best airports for getting to and from Radolfzell Germany. .....price, best days to travel (and purchase air fare) etc. I'm not an international traveler so any tips would be appreciated. 2 adults only will be traveling and 1 of us is quite familiar with Germany. Thank you all in advance.