cheapest transport from beijing capital airport to the novotel peace.

Hi, it should be to take the airport shuttle bus and then transfer to the subway line.
Well, you can take the shuttle bus line 5 to Xiaoying Station. After that, you can walk to Huixinxijiebeikou Station to take subway line 5 to Dengshikou MTR Station. Going out of the staion from Southwest Exit C, you can reach your hotel by walking about 500m.