The price of flights is always one of the most important costs on any trip we want to do. Determining the price variation, upwards and downwards, is really impossible, since the variability of factors is very important.
Here I give you some clues in case they can be of any help:
TOUR OPERATOR RATES: These are the rates that tour operators negotiate directly with the airlines. They are usually only available to professionals in the sector, and are only established on Trans-oceanic flights.
There are large price differences, sometimes more than 300 or 400 € per person.