If you want a cheap flight from Colombo (Sri Lanka) to London, you've got one airlines to choose from.
Make sure you use the search options above to search for flights to other airports in London, not just London City Airport. The more options you look at, the better your chance of finding a cheap deal. Just so you know, the flight typically takes 20 hrs 5 mins.
There are about five 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.