Question : Over the coming months, which airline is getting their passengers to London Heathrow Airport (LHR) round-trip the cheapest?
Answer : KLM is your best bet for finding that coveted low fare. They're offering fares as low as $674, while prices for other flights are as high as $739.
Question : How long do most people visit London?
Answer : Of course you're not most people, but if you were, you'd stay roughly two weeks.
Question : What day in the next four weeks has the best fares?
Answer : As of May 16th, the cheapest day to fly from Xiamen to London is May 17th. Tickets are currently being sold for $674, which is 5% below the average price for this route.
Question : Are you paying the cheapest or highest price for your ticket to London?
Answer : Ranging from $674 to $739, prices for XMN to LHR fluctuate a lot less than most routes from China. The further out you book a route, the more likely you are to save.