ORD-DUS via LHR on british airways

LAX-ORD via COS on united airlines

STL-LAX via DEN on united airlines

ORD-STL on united airlines

DUB-DUS on aer lingus

ORD-DUS via LHR on british airways

DUS-ORD via LHR on british airways

STL-DUS via IAD and CDG on united airlines

FRA-STL via ORD on united airlines

ORD-DUS via ZRH on swiss

DUS-ORD via ZRH on swiss

ORD-DUS via CPH on scandinavian airlines

IAD-ORD on united airlines

DUS-BOS via MUC on lufthansa