The cheapest airline to fly to with is normally EasyJet. But if you're flexible about when you go to London Stansted, try looking at flights in September, as this is usually the cheapest time to go to United Kingdom. Play around with the search options to see what you can find.
September will generally be the most expensive month to go to London, as it's peak season. Accommodation is typically pricier at this time of year too. If you want to go at this time of year, try looking at other cities in United Kingdom to get a cheaper flight.
When it comes to getting cheap flights to , the most important thing is to book in advance. Bargain deals and last-minute offers for London do crop up, but you'll have to be flexible to get them. If you want to fly at a specific time, it's always best to book early. The same applies to hotels – the earlier you book, the more choice you'll have.