After the contract has been concluded, prices may only be increased if the contract expressly provides for this possibility and indicates that the traveller is entitled to a price reduction. In this case, the contract must specify how the price revision is to be calculated. Price increases are only possible if they are the direct consequence of a change in:
1° The price of passenger transport resulting from the cost of fuel or other energy sources;
2° The level of taxes or charges on travel services included in the contract, imposed by a third party not directly involved in the performance of the contract, including tourist taxes, landing taxes or embarkation and disembarkation taxes at ports and airports; or
3° Exchange rates relevant to the contract.
Regardless of its size, a price increase is only possible if the organiser or retailer notifies it to the traveller in a clear and comprehensible manner, with justification and calculation, on a durable medium, no later than twenty days before the start of the journey or holiday.
If the contract provides for the possibility of a price increase, the traveller is entitled to a price reduction corresponding to any reduction in the costs mentioned in 1°, 2° and 3°, which occurs after the conclusion of the contract and before the start of the journey or stay.