Yes, there are multiple flights from Hanoi to Glasgow for under 78,576,384₫. The cheapest flight booked recently is on Multiple Airlines for just 78,114,168₫, but on average you can expect to pay 78,114,168₫.
There are no direct flights from Hanoi to Glasgow, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
You can imagine temperatures to be in the 34 °C range in June. The weather in Glasgow 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.