There are several ways to book a flight. The most economical of these is to use a relevant flight comparator.
In the last few years, there has been a real explosion in this sector as more and more flight comparison services have been set up. This is quite normal when you know that they get on average between 1 and 5% of the air ticket sold. Multiply this by a few thousand sales per day and you will understand that the business model is very interesting. But before you get there, you have to be visible. And the most visible of them are about ten in France.
The best of them
You can type in a request such as “flight comparator” on the Internet to discover a very large list. However, it is important not to use just any comparator. Some of them do not list all the airlines’ prices and only highlight the airlines that pay them the most. Basically they spread their legs and only offer the deals they want to present to the user. Fortunately, this is not the case for all these players. The most serious ones today are Google flight for the USA or Liligo for France and the rest of Europe. I strongly recommend that you use this site when searching for cheap flights.