She did not immediately know how much money it cost to keep the floor open.
CME said it can make trading more efficient by locating the KCBT wheat futures and options pits next to the CBOT wheat pits.
KCBT trades a high-protein variety of wheat used to make bread, while CBOT trades a lower-quality variety used to make doughnuts and snack foods.
"By moving Kansas City wheat to the Chicago floor later this year, we will make it as efficient as possible for our customers to trade both products and the spread between the two," said Bryan Durkin, CME chief operating officer, in a statement.
CME said it does not plan to close its Chicago trading floor. KCBT executives declined to comment.
The proximity of the pits could improve spread opportunities and the overall execution of trades, said Sterling Smith, futures specialist at Citigroup in Chicago, who noted he was not surprised by the move.
The move "just marks the continued evolution of the futures trading business," he said.