A refrigerator appliance, as provided herein, may include a cabinet, a first liner, a second liner, a first fan, a second fan, and a return line. The cabinet may define an evaporator chamber. The first liner may be attached to the cabinet and may define a first chilled chamber having a primary air inlet, a secondary air inlet, and an air outlet. The second liner may be attached to the cabinet and may define a second chilled chamber spaced apart from the first chilled chamber, the second chilled chamber having an air inlet and an air outlet. The return line may extend in fluid communication from the air outlet of the second chilled chamber to the secondary air inlet of the first chilled chamber.