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100K ultra runs in London in May 2025

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

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Walk, jog or run the journey from Capital to Coast, over the North and South Downs. A fully supported challenge leaving Richmond-upon-Thames for the finish line at Brighton Racecourse.
  • Sat 24 May 2025
  • 13 charities
  • Sat 24 May 2025
  • 13 charities
Richmond, UK

London 2 Brighton Ultra Challenge | Full 100km continuous charity places

Walk, jog or run the journey from Capital to Coast, over the North and South Downs. A fully supported challenge leaving Richmond-upon-Thames for the finish line at Brighton Racecourse.

  • Chip timing
  • Enter online
  • GPS tracking
  • Hilly
  • Age 18 & over
  • 100 km trail running + 1500 m ascent
Walk, jog or run the full 100km London to Brighton route, over two daytime sessions, with an overnight stop at the Basecamp at Turners Hill.
  • Sat 24 - Sun 25 May 2025
  • 13 charities
  • Sat 24 - Sun 25 May 2025
  • 13 charities
Richmond, UK

London 2 Brighton Ultra Challenge | Full 100km over 2 days charity places

Walk, jog or run the full 100km London to Brighton route, over two daytime sessions, with an overnight stop at the Basecamp at Turners Hill.

  • Enter online
  • Undulating
  • Hilly
  • Age 18 & over
  • 100 km trail running + 1500 m ascent

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