Flat Half marathons in Cardiff
Find flat half marathons in Cardiff in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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- Sat 8 Nov
- £30-£35
Cardiff MoRun | Half Marathon
MoRunning brings everyday people together with the focus being to inspire you, your family, your kids and your friends to have the best time running! Get ready for the half marathon, Cardiff!
- Chip timing
- Enter online
- Flat
- Age 17 & over
- 13.1 miles road running

- Sun 4 Oct 2026
- £58
- 2 charities
Oysho Cardiff Half
An iconic road race around Wales' capital offering a flat course from the castle to the marina and over the Cardiff Bay barrage!
- Families
- Carbon offset
- Wheelchair users
- Recycling
- Entertainment
- Music
- Chip timing
- Enter online
- Flat
- PB
- Traffic free
- Fancy dress
- Event village
- Urban
- Coast
- Sustainability policy
- Public transport links
- Age 17 & over
- 13.1 miles road running + 81 m ascent
- Sun 1 Feb 2026
The Cardiff 5K, 10K and Half Marathon Winter Warmer Run | Half Marathon
- 13.1 miles road running