<human>:  What is the most economical way to fly to London?
<bot>: The most economical way to fly to London is to book your ticket in advance and look for the best deals on flights. Many airlines offer discounts for booking flights several weeks or months in advance, so you can often find good deals if you plan ahead. It is also advised to check out budget airlines, which usually offer cheaper fares but may come with fewer amenities than other flights.