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100K ultra runs in London in September 2025

Find 100k ultra runs near me in London in September 2025 - search by date or place, display on a map or use the advanced search to find your perfect race.

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The full, non-stop option of the Thames Path Challenge from leafy South West London following the river to Hampton Court, Runnymede to finish at Henley-on-Thames for a celebratory finish and BBQ.
  • Sat 13 - Sun 14 Sep 2025
  • 11 charities
  • Sat 13 - Sun 14 Sep 2025
  • 11 charities
London, UK

Thames Path Challenge | Full 100km continuous charity places

The full, non-stop option of the Thames Path Challenge from leafy South West London following the river to Hampton Court, Runnymede to finish at Henley-on-Thames for a celebratory finish and BBQ.

  • Chip timing
  • Enter online
  • GPS tracking
  • Flat
  • Undulating
  • Age 18 & over
  • 100 km trail running + 350 m ascent
The full distance option of the Thames Path Challenge over 2 days with 50km on day 1 and 50km on day 2, meaning you experience the route in daylight with the chance to sleep overnight.
  • Sat 13 - Sun 14 Sep 2025
  • 11 charities
  • Sat 13 - Sun 14 Sep 2025
  • 11 charities
London, UK

Thames Path Challenge | Full 100km over 2 days charity places

The full distance option of the Thames Path Challenge over 2 days with 50km on day 1 and 50km on day 2, meaning you experience the route in daylight with the chance to sleep overnight.

  • Chip timing
  • Enter online
  • GPS tracking
  • Undulating
  • Age 18 & over
  • 100 km trail running + 350 m ascent

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