Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Noi-Bai to Lishe International as you normally would.
When traveling, we recommend packing in preparation to handle common weather conditions. The rainfall in Hanoi is typically less than Ningbo. We can gather that this will continue over the next 14 days.
You can imagine temperatures to be in the 34 °C range in June. The weather in Ningbo is generally colder than Hanoi's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.