I booked a flight to Turku from London and paid with my debit card, the fare is 600GBP but I have been charged additional 3GBP (0.05%), WHY? Similar to credit card surcharge, in recent years, the merchant’s banks have started to charge debit cards surcharge as well. Credit cards usually have 3%-4% surcharge (varying between card issuers) and debit cards have a 0.05% surcharge which is added on top of the amount charged from the card. Frequently Asked Question »