When flying from Bangkok Intl to Xining, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Bangkok Intl is roughly greater than that of Xining. You can assume this to be the case over the next 3 days.
Some of our airline partners flying from Bangkok Suvarnabhumi to Xining Caojiabao have new flexible policies in place due to COVID-19. China Southern is one of the carriers where you may find flexible change policies. You can use our site to filter for airlines like China Southern with this kind of flexibility.
Expect the weather to be around 36 °C on average in April. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Xining is generally colder than in Bangkok Intl.