If you want a cheap flight from Phuket to London, you've got two airlines to choose from.
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 16 hrs 50 mins to fly 9901 km to London Gatwick.
There are about nine flights to or via London every week, so you have plenty of options. Keep your eye out for flights
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.