O'Hare is one of the rare American departure points where you genuinely have two world-class business class products competing head-to-head on the same transatlantic corridor, and that rivalry works entirely in your favor. United's Polaris cabin on this route is consistently operated by a wide-body — typically a 787-9 or 777-200ER — and the difference between the two matters more than most travelers realize. Push for the 787-9 if you can, where Polaris seats in a 1-2-1 configuration give every passenger direct aisle access and the cabin humidity levels make an eight-and-a-half-hour overnight feel genuinely restorative. Lufthansa, meanwhile, operates its Frankfurt hub flights out of ORD with a product that reflects the airline's quiet German confidence — their Business Class on the A340 or 747-8 routes offers a more traditional herringbone layout, but the on-the-ground experience at Frankfurt Airport, where Lufthansa's Senator and HON Circle lounges are among the finest in Europe, rewards loyalty to their metal in ways that extend well beyond the flight itself.
Frankfurt's Terminal 1 is Lufthansa's sovereign territory, and arriving there as a business class passenger means fast-track immigration lanes and seamless connections that United arrivals in Terminal 2 simply don't enjoy to the same degree — a practical consideration if Frankfurt is a gateway rather than your final destination. For the sharpest premium cabin value, January through early March is when award availability opens up and discounted revenue fares appear with unusual frequency on this route, driven by the post-holiday corporate lull. October and November offer a similar window before the holiday surge closes things off. Avoid late June through August unless your schedule is fixed — summer transatlantic demand on this corridor is relentless, and the leverage shifts firmly to the airlines.
