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Cardiff X4
 

Cardiff bound? X4 - Merthyr to Cardiff

Your direct link between Merthyr Tydfil and Cardiff!

Service X4 offers a convenient, comfortable way to travel between Merthyr Tydfil and Cardiff city centre, with stops at Pontypridd, Nantgarw Industrial Estate and more.

Whether you're heading to work, hitting the shops, or enjoying a day out, X4 gets you there with ease.

🕒 Running up to every 60 minutes

From Monday to Saturday, you can catch Service X4 as often as every hour, perfect for flexible travel plans and spontaneous outings.

🛍️ Ideal for:
  • Commuters heading into Cardiff or Nantgarw.
  • Shoppers looking for a stress-free journey to the city centre.
  • Day trippers exploring South Wales without the hassle of parking. 

Service X4 Timetable - Valid from 1st September 2025

 

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Passenger types

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Please see our Guide to tickets for more information on passenger types.

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🎟️ Ticket Options:

💰 DayRider - Unlimited travel on Stagecoach South Wales bus services*.

💰 MegaRider - Ideal for those who are travelling multiple times a week on Stagecoach South Wales services*.

💰 Aged between 16-21 years old? Apply for a mytravelpass where you can benefit from the Welsh Government scheme and your single ticket will only cost you £1*!

💰 5-15 year olds can travel for just £1 per single journey or a £3 DayRider.

🆓 Over 60? Apply for your concession bus pass, you will be able to travel for free on Stagecoach South Wales services.

 
📍 Stops on Route:
  • Merthyr Tydfil
  • Pontypridd
  • Treforest Industrial Estate
  • Cardiff City Centre
 

Get going with the Stagecoach Bus App!

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Planning your journey, tracking your bus, and buying your ticket has never been easier. 

Download the app and get everything you need in just a few taps - so you can focus on the journey, without the worry!

🗺️ Plan your trip with ease

Enter your starting point and destination, and the app will find the best route for you. Check real time travel updates and choose the option that fits your schedule.

🚌 Track your bus live

No more waiting around! See exactly where your bus is in real time so you’ll know when to head to your stop.

🎟️ Buy tickets in seconds

Buy before you board using the Stagecoach Bus App - including single tickets, DayRider and MegaRider options.

We’ve got your journey covered - every step of the way!

Download now

 
make our app your partner for your journeys

*If you buy a South Wales All Zones DayRider, you will be able to travel across Wales on Stagecoach Wales bus services. Please read the full T&Cs before purchasing to check this ticket it is valid for your journey.

**a valid mytravelpass card will need to be shown to our friendly drivers along with your mytravelpass ticket.