Generally speaking, which side of the plane can see more beautiful scenery depends on the specific flight route and weather conditions. However, if you want to see the beautiful scenery by the window when you fly from Beijing to Kunming, I suggest you choose the seat on the left. Because usually, when the plane is flying, the direction of Kunming will be to the left, so choosing the seat on the left can give you a better chance to enjoy the beautiful scenery during the flight. However, please note that the above is for reference only, depending on the specific situation.