The short answer

What matters far more than the logo on your card is whether your bank charges a foreign transaction fee. A card with a 2.99% fee costs you around ten times more than the typical difference between Visa's and Mastercard's exchange rates. Choose fee-free cards first, then make sure you have one of each network.

The other thing that matters is whether a business takes cards at all. Street food, markets, tuk-tuks, songthaews and many small shops are cash-only or use Thai QR payments, regardless of network. Card acceptance is about the size and type of business, not Visa versus Mastercard.

Card acceptance in Thailand, by network

This is how the main card networks compare for a British visitor in Thailand in 2026:

Travellers' reports in 2025 and 2026 consistently find Visa and Mastercard working at nearly every business that accepts cards — from 7-Eleven to market kiosks with card machines — while American Express is refused at local restaurants, massage shops, small hotels and many places outside Bangkok.

The sticker in the window tells you what a business accepts. If you see Visa, you'll almost always see Mastercard next to it. If you see only a QR code, it's a Thai QR payment, and you'll need cash.

Visa vs Mastercard exchange rates

When you pay in baht with a UK card, the card network converts the amount into pounds at its own daily rate. Your bank then adds its own fee — or, on the cards in this guide, nothing. Visa and Mastercard both publish their rates, and both offer online calculators.

As an example, Visa's rate for 9 October 2026 converted ฿10,000 to £225.95 — about ฿44.26 to the pound, very close to the mid-market rate on the same weekend.

Comparisons over the years have found that the two networks' rates are usually within a fraction of a per cent of each other, and that Mastercard has come out slightly ahead more often than Visa across most currencies. But the gap varies by currency and day, and on some days Visa is better. On a fortnight's spending of around £1,000, the difference is typically a few pounds at most.

Two things matter far more than the network:

• Your bank's foreign transaction fee. 2.99% on a standard card dwarfs any network difference.
• Dynamic currency conversion. If a terminal or ATM converts to pounds for you, its rate is typically several per cent worse. Always pay in baht.

Some providers don't use the network rate at all. Wise converts at the mid-market rate with its own fee, and Revolut uses its own rate within your plan's allowance. For those cards, Visa versus Mastercard makes no difference to the rate.

The best fee-free cards on each network

The cards below all charge no fee for spending in Thailand. Pick at least one Mastercard and one Visa, ideally from different banks.

Fee-free cards by network

Pick one from each column of networks. Scroll sideways on a phone.

Checked 11–12 October 2026. Credit is subject to status. Thai ATMs charge their own fee (usually ฿220) on every foreign card.

Why you should carry one of each

If acceptance is the same and the rates are close, why bother with two networks? Because the real risk in Thailand isn't that Visa or Mastercard won't be accepted — it's that your particular card stops working at the wrong moment.

The ideal pairing for most British travellers is a fee-free Mastercard debit card from one bank, such as Chase or Starling, and a fee-free Visa — either Kroo as a debit card, or Barclaycard Rewards or Lloyds Ultra as a credit card. Keep them in different places: one in your wallet, one in the hotel safe or a separate bag.

Tapping in on the Bangkok MRT

One of the biggest recent changes for visitors is that Bangkok's MRT now takes contactless bank cards at the gates. The Blue and Purple lines accept contactless Visa, Mastercard and UnionPay cards, and the old MRT stored-value cards were retired from 1 June 2026. You simply tap your card — or your phone — at the gate on the way in and out.

A few things to know if you tap with a UK card:

• Use a fee-free card. Every journey is a separate small baht payment, so a card with a foreign fee costs you on every trip.
• Use the same card in and out. The fare is worked out from where you tap in and out.
• Expect a small temporary hold. A verification amount may appear briefly; the actual fare usually posts a day or two later.
• The BTS Skytrain is different. The Green Line BTS still uses its own Rabbit card or single tickets, so you'll need one of those for the Skytrain.

Thailand passed a law at the end of 2025 to bring all public transport onto a common ticketing system, with a target of a single, unified fare system by 2027. Until then, expect a mix: contactless on the MRT, Rabbit cards on the BTS and cash on buses and river boats.

Apple Pay, Google Pay, Grab and online

Both networks work with Apple Pay and Google Pay, and you can tap your phone on any contactless terminal in Thailand that takes your card — including the MRT gates. The payment goes through the card in your wallet, so the same fees, or lack of them, apply.

For ride-hailing and food delivery, Grab and Bolt accept both Visa and Mastercard in their apps. Add a fee-free card and pay in baht. Online, Thai airlines, hotels and tour operators generally accept both networks; when a site offers to charge you in pounds, choose baht instead.

What neither network can do is pay a Thai QR code. PromptPay QR payments, found at almost every street stall and market, are designed to be paid from a Thai bank app. Without a Thai bank account, use cash for those.

What about Amex, JCB and UnionPay?

American Express is the network British travellers are most likely to have problems with in Thailand. It's accepted at large hotels, upscale restaurants, department stores and international chains in Bangkok, but travellers regularly report it being refused at local restaurants, massage shops, small hotels, some 7-Elevens and many businesses outside the capital. Several Thai bank ATMs also reject Amex cards. Some Amex cards also charge a foreign usage fee of around 3% — the Platinum Card charges 2.99%.

If you carry an Amex for its points or perks, treat it as an extra, never as your main card for Thailand.

JCB and UnionPay are widely accepted at larger Thai merchants because of the large numbers of Japanese and Chinese visitors, and UnionPay works at the MRT gates. But neither is commonly issued in the UK, and there's no reason for a British traveller to seek one out.

Before you fly: a two-network checklist

• Check the logo on each card and make sure you have one Visa and one Mastercard.
• Check both are fee-free abroad — the fee matters more than the network.
• Choose cards from different banks, so one bank's fraud block doesn't stop both.
• Add both to Apple Pay or Google Pay for tapping, including at the MRT.
• Turn on notifications and know how to unfreeze each card in its app.
• Know both PINs — Thai terminals often ask for them.
• Store them separately while you're travelling.
• Save each bank's overseas number somewhere other than your phone.