@freemo @trinsec For domestic flight I always try to choose the business or first class when I'm flying alone, the price is not that crazy if you got the timing right. Last year I went to Yunnan and the price for round trip with business class is less than 4000 CNY (at this time the economy price is about 900 CNY for round trip). But when I went to Yunnan during the spring festival (follow my relatives), the economy class cost more than 4000 CNY.
But sadly it's getting difficult to find wide-body aircraft for domestic lines, like A350-900, where you can lie flat comfortably. For aircraft like A320, I think it's just a wider version of economy seat.
Internation one is always expensive, even during the off-season :(