The advertised total price of a flight must always include at least one commonly used payment method free of charge. This rule stands irrespective of the route via which the consumer arrives at the website selling flights - directly or, for example, via flight comparison sites.
The seller has the right to select the payment method that it includes in the total price, as long as it really is customary and commonly used.
If a charge is made for the use other payment methods, it must be appropriate and shall not exceed the real cost incurred by the payee for the use of the payment method in question.
Surcharges specific to a payment method must also be clearly indicated at the very beginning of the booking process for a flight, in order to provide the consumer with information on the total cost of the flight from the outset.
Information on other optional surcharges must also be provided in an open and timely manner. Legislation, for example, requires that the consumer must be informed of any supplements charged for baggage at the beginning of the booking process.
Guidance for the sellers of flights on payment surcharges, Finnish Consumer Ombudsman´s Newsletter 6/2017