Carmarthen to Merthyr Tydfil: Road Trip Guide & Distance

How far is Carmarthen from Merthyr Tydfil?

The distance from Carmarthen to Merthyr Tydfil is 40.3 miles (64.9 km) as the crow flies. Merthyr Tydfil is located E of Carmarthen. By car, the driving distance is approximately 52.4 miles, taking about 1h 3min. A direct flight would take roughly 35min. Both are located in United Kingdom.

This is a quick and easy drive, perfect for a day trip or weekend getaway. You can easily make the round trip in a single day. Heading East means you'll be driving into the sunrise if you start early. Keep your windshield clean for the best visibility. Given the short distance, driving or taking a train is often faster and more convenient than dealing with airport security and flight boarding times.

Coordinates come from public place data for Carmarthen and Merthyr Tydfil. The driving distance is estimated from straight-line distance with a road-factor model, so confirm the route in your navigation app. Fuel, flight, bus, and train values are planning estimates and can change by date, provider, road closures, and border rules.