There are five airlines offering flights to London. The most direct route isn’t necessarily the cheapest – being flexible is key to finding the lowest airfare rates. For example, try searching by month to see the best time of the week to fly. The cheapest date is currently 20 / Jun / 2019.
London Gatwick is just one of the airports in London. If you're not set on a specific airport, try changing your search from London Gatwick to London to see a broader range of flights – they might be cheaper. It usually takes about 11 hrs 30 mins to fly 8440 km to London Gatwick.
You can expect accommodation prices to be higher at this time of year too. Last-minute deals do crop up, but it's best to book everything in advance to avoid disappointment.