London 100

MAY
9
2026
An urban ultramarathon in central London with 100 km, 50 km and 25 km options, a route visiting over 100 landmarks, open road sections on trails and pavements, and an 18 plus age requirement.
Sat 9 May 2026
100 miles

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London 100

London 100 is an urban ultramarathon that starts and finishes in central London. The route passes through and around central areas and includes more than 100 of the capital's landmarks and sights. The event offers multiple distance options to suit longer and shorter ultra distances.

Distances:

  • 100 km ultramarathon
  • 50 km ultramarathon
  • 25 km event

The course is an open road event using trails, towpaths, pavements and footpaths in and around London. Participants will need to cross roads at pedestrian crossings and should take care with other pavement users. The event enforces cut off times; entrants may have up to 17 hours to complete the course, calculated from the estimated completion time provided at registration. All entrants must be 18 or over on the day of the event.

Half price charity entries are offered with a fundraising request for the charity Aspire and require sharing of entrant contact details with that charity; fundraising targets and contact sharing depend on the chosen distance. Volunteer tickets are available for a period before the run, during which volunteers assist with race pack distribution and bag drop. Visit the organization's website for the most recent information.

100 mi
London 100
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