Poznan remains one of Europe's more elusive business class destinations from the American Midwest, and after routing through this corridor more times than I can count, I can confirm there's no nonstop way to do it — business class from Kansas City to Poznan always means a transatlantic connection followed by a shorter European hop into Poznan-Ławica Airport, which handles limited long-haul widebody traffic itself. The most reliable strategy is building your itinerary around Delta's transatlantic metal to Amsterdam or Paris, United's Star Alliance strength through Chicago and onward to Frankfurt or Munich, or LOT Polish Airlines' natural home-field advantage via Warsaw. Total journey time hovers around 10.5 hours of flying, though with connections you're realistically looking at 13-16 hours door to door.
My preference has consistently been the United routing through Chicago O'Hare, transferring onto a Star Alliance partner into Warsaw before catching LOT's short regional hop to Poznan — United's Polaris Business on the transatlantic leg delivers lie-flat comfort with proper direct-aisle access on their 787 and 777 fleets, a meaningful upgrade over older configurations still found on some competitor aircraft. Delta routes typically funnel through Amsterdam or Paris, where their Delta One suites (particularly on the A330-900neo or A350) offer excellent privacy doors, though you'll then need a separate ticket or careful connection into Poznan via a regional carrier. LOT itself operates business class on its 787 Dreamliners between Chicago and Warsaw, a smart alternative if you can position yourself through that gateway instead of Kansas City directly.
One insider tip: LOT's Warsaw hub connection to Poznan is often more reliable in winter months than routing through Frankfurt or Amsterdam, where snow delays cascade badly onto short regional legs. January through March and October through November consistently show the softest business class pricing on this corridor, as leisure demand to Poland dips outside summer festival season. Given how erratic award space and fares fluctuate on these connecting itineraries, setting up automated fare tracking for this specific routing will save you from manually checking three separate airline sites every week.