This flight path from London Luton to Seoul Incheon Intl was viewed by 75 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Luton is roughly greater than that of Incheon. You can assume this to be the case over the next 17 days.
You can imagine temperatures to be in the 29 °C range in August. The weather in Incheon is generally hotter than Luton's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.