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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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An iconic road race around Wales' capital offering a flat course from the castle to the marina and over the Cardiff Bay barrage!
  • Sun 4 Oct 2026
  • £5-£60
  • 12 charities
Cardiff, South Glamorgan, UK

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
  • Venue accessible
  • Recycling
  • Entertainment
  • Music
  • Chip timing
  • 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
Cardiff, UK

The Cardiff 5K, 10K and Half Marathon Winter Warmer Run | Half Marathon

  • 13.1 miles road running
  • Sun 1 Mar 2026
Cardiff, UK

St Davids Day Run | Half Marathon

  • 13.1 miles road running

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