Pricing on Detroit to Leipzig business class swings a lot depending on when you fly. January, February, and March are consistently the cheapest months because Germany's winter isn't a draw for leisure travelers, so award and discounted business seats open up more freely — we regularly see fares near the $2,400 floor in this window. October and November are the second sweet spot, after the summer conference season winds down but before holiday travel picks up. Summer months and December get tight and expensive fast, since Leipzig's trade fair calendar (and Christmas market season right after) pulls business and leisure demand at the same time. If your dates are flexible, booking 3-4 months out in one of those five best months is where you'll find the real savings — consolidator fares like ours move with demand, so waiting until the last minute rarely helps on a route with this few direct competitors.