If you're considering taking a flight in the foreseeable future, you might want to check out farecast.com. The good thing about Farecast is that not only does it help you find the cheapest flight, it also predicts when the price of the flights will rise or fall. It's a US website so the prices are in dollars but don't let that stop you. We live in a globalised world - you no longer have to use UK travel brokers to purchase flights from the UK.