100K ultra runs in London

Find 100k ultra runs near me in London for 2025/2026 - filter by date or location, 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 epic 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
£199
17 charities

Sat 13 - Sun 14 Sep
£199
17 charities

London, UK

Thames Path Ultra Challenge | Full 100km Continuous

The full, non-stop option of the epic 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

An epic challenge from leafy South West London on the River Thames featuring Hampton Court, Runnymede of Magna Carta Fame, Henley-on-Thames and a fabulous celebration finish - all in daylight.

Sat 13 - Sun 14 Sep
£199
17 charities

Sat 13 - Sun 14 Sep
£199
17 charities

London, UK

Thames Path Ultra Challenge | Full 100km over 2 days

An epic challenge from leafy South West London on the River Thames featuring Hampton Court, Runnymede of Magna Carta Fame, Henley-on-Thames and a fabulous celebration finish - all in daylight.

Chip timing
Enter online
GPS tracking
Flat
Age 18 & over

100 km trail running + 350 m ascent

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