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Flat 5K runs in South East in September 2026

Find flat 5k runs in South East in September 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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Select an event for photos, video, route, location, reviews, entry fees and how to enter.

Enjoy every spellbinding step of a 5K through the stunning landscape of Rye Harbour Nature Reserve in this exceptional summer series. Enter one or enter more and watch your times improve.
  • Fri 4 Sep
  • £16
Rye, East Sussex

Rye Summer 5K Series | Race Five | 5K

Enjoy every spellbinding step of a 5K through the stunning landscape of Rye Harbour Nature Reserve in this exceptional summer series. Enter one or enter more and watch your times improve.

  • 5 km road running
  • Chip timing
  • Enter online
  • Flat
  • Age 11 & over
Choose your distance and chase your personal best on the flat, chip-timed 5K course at London 2012's iconic Olympic venue; all abilities welcome.
  • Sat 26 Sep
  • £28
Windsor, Buckinghamshire

Run Dorney Lake | September | 5K

Choose your distance and chase your personal best on the flat, chip-timed 5K course at London 2012's iconic Olympic venue; all abilities welcome.

  • 5 km road running
  • Chip timing
  • Enter online
  • Flat
  • PB
  • Traffic free
  • Age 11 & over
  • Sat 12 Sep
  • £6-£54
Camberley, Hampshire

Twilight Runway Challenge | 5K

  • 5 km road running
  • Sun 13 Sep
  • £16-£38
Brockenhurst, Hampshire

New Forest Marathon | 5K

  • 5 km multi terrain running + 50 ft ascent

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