Travel Money: Where Exchange and Card Fees Really Come From

When planning a trip, it is natural to wonder when, where and how much money to exchange. The rate on the news, the amount you actually receive and the figure that appears on your card statement rarely match. Once you know where the differences come from, the choice becomes much simpler.

The Headline Rate Isn't Your Rate

The figure in a currency converter or the news is close to the interbank mid-rate. When you buy cash at a bank, a margin is added, and when you sell leftover cash back you receive less than the mid-rate. Exchange too much, bring it home and convert it back, and you lose the margin twice without spending anything.

What Each Method Costs

Cash from a bank includes a margin, but Korean banks' mobile apps offer preferential rates that can remove much of it, especially for major currencies such as the US dollar, yen and euro. Ordering through the app and collecting at a branch or the airport is usually cheaper than walking up to the counter.

Prepaid travel cards let you load foreign currency in advance and pay abroad. Many waive exchange and foreign-transaction fees. The rate is fixed when you load, so some travellers top up in stages.

Credit cards convert at the card network's rate on the processing date and add network and foreign-use fees, usually around 1–2% in total. You pay a little more for convenience and protection if the card is lost.

ATM withdrawals may involve both your card issuer's fee and the local ATM operator's fee. Many small withdrawals add up, so take out larger amounts less often if you need cash.

Say No to "Pay in Your Home Currency?"

Card terminals and online checkouts abroad sometimes offer to charge you in your home currency. This is dynamic currency conversion (DCC), and the merchant's rate and fees often make it 3–8% more expensive than paying in the local currency. It looks convenient but is usually the most expensive option. Many card apps let you block DCC before you travel.

What $100 Really Costs

Assume a mid-rate of 1,350 won per dollar, so $100 is 135,000 won. Paid by credit card it comes to roughly 136,500 with fees. Paid through DCC with just a 5% markup it becomes 141,750. That is a few thousand won per purchase, but on a 2 million won trip budget it can approach 100,000 won.

When Should You Exchange?

Even professionals struggle to predict exchange rates. If your trip is months away, exchanging in two or three stages smooths out the average rate, and rate alerts in banking apps can tell you when a target is reached. Reducing fees is a far more reliable way to save than timing the market.

Airport Counters and Cash-Heavy Destinations

Exchanging at the airport at the last minute usually means little or no preferential rate; order through an app at least a day ahead instead. How much cash you need depends on where you go. Big cities in the US and Europe run almost entirely on cards and phone payments, while small restaurants in Japan, traditional markets and street food in Southeast Asia, and some taxis still prefer or require cash.

Leftover Money and Lost Cards

If you plan another trip, keep leftover notes rather than converting them back. Banks often refuse coins or buy them at a poor rate, so spend them on snacks or transport on the last day. Balances on prepaid cards can be used next time or refunded at the rate on the refund date. Save your card issuer's overseas lost-card number on your phone and carry two cards in separate places.

Before you leave, use the Currency Converter to turn your daily budget into the local currency and back, then add 1–2% for fees. It makes spending on the road much easier to track.