X4 bus: Cardiff – Merthyr Tydfil

Stagecoach South Wales bus X4 runs between Merthyr Tydfil and Cardiff via Pontypridd and Treforest Industrial Estate. Runs Monday to Saturday. On Thursday 5 November the first bus from Merthyr Tydfil leaves at 06:31 and the last at 17:15, about every hour during the day.

Operated by Stagecoach South Wales. Timetable for Thursday, 5 November 2026. Plan a journey · Print this timetable

Questions

When is the first and last X4 bus from Merthyr Tydfil to Cardiff?
On Thursday 5 November the first bus leaves Merthyr Tydfil at 06:31 and the last at 17:15, 11 journeys in all.
When is the first and last X4 bus from Cardiff to Merthyr Tydfil?
On Thursday 5 November the first bus leaves Cardiff at 07:37 and the last at 18:25, 11 journeys in all.
Does the X4 bus run on Sundays?
No. Runs Monday to Saturday.
How often does the X4 bus run?
On Thursday 5 November it runs about every hour during the day (09:00 to 15:00), 11 journeys from Merthyr Tydfil.
Where does the X4 bus stop?
Main stops from Merthyr Tydfil to Cardiff: Merthyr Bus Station 8 (Merthyr Tydfil), Pontypridd Bus Station Stand 8 (Pontypridd), Day Centre (Treforest Industrial Estate), Greyfriars Road GJ (Cardiff). The full list is in the timetable below.
Who runs the X4 bus?
Stagecoach South Wales.

Merthyr Tydfil to Cardiff

StopJourney 1Journey 2Journey 3Journey 4Journey 5Journey 6Journey 7Journey 8Journey 9Journey 10Journey 11
Merthyr Bus Station 8, Merthyr Tydfil06:3107:2108:3109:3310:3311:3312:3313:3314:4516:0017:15
Pontypridd Bus Station Stand 806:5407:4508:5709:5710:5711:5712:5713:5715:0916:2617:41
Day Centre, Treforest Industrial Estate07:0607:5809:1010:0911:0912:0913:0914:0915:2116:3917:53
Greyfriars Road GJ, Cardiff07:3108:3409:3610:3411:3412:3413:3414:3415:4917:0918:19

Cardiff to Merthyr Tydfil

StopJourney 1Journey 2Journey 3Journey 4Journey 5Journey 6Journey 7Journey 8Journey 9Journey 10Journey 11
Greyfriars Road GJ, Cardiff07:3708:4009:4010:4011:4012:4013:4014:4016:0017:2018:25
Day Centre, Treforest Industrial Estate08:0109:0310:0311:0312:0313:0314:0315:0616:3317:5018:49
Pontypridd Bus Station Stand 508:1309:1510:1511:1512:1513:1514:1515:2216:5018:0619:01
Merthyr Bus Station 1, Merthyr Tydfil08:3709:3910:3911:3912:3913:3914:3915:4717:1818:3119:26

Places on this route

Timetables from the Bus Open Data Service (Department for Transport), updated Thursday, 5 November 2026. Stop details from NaPTAN. Train timetables contain data from Network Rail, licensed under the Open Government Licence; live train times from National Rail. Times are UK local time and can change at short notice: check before you travel.

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