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Triathlon Calendar near Sunbury-on-Thames 2026-2027

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Explore the top triathlons near Sunbury-on-Thames for 2026-2027! We've gathered 42 exciting races in the area. Check out our detailed list below to find your next local race.

September 2027
Sep
5
Su

The One on the Lake - Dorney

Triathlon Duathlon Aquathlon Multisport 5 km 10 km 15 km
One on the Lake Dorney on 5 September 2027 offers triathlon, duathlon, aquabike, aquathlon, open water swims and 5K, 10K and 15K runs with pro timing and medals.
Sep
12
Su

Reading Triathlon, Aquathlon & Aquabike

Triathlon Aquathlon Aquathlon 750 m 5.4 km Super sprint 400 m 12 1.8 km Sprint 750 m 22 km Sprint 750 m 22 5.4 km
Multi-distance triathlon, aquathlon and aquabike at the H2O Swim Centre lake in Reading on 12 September 2027, featuring open water swims and single loop road cycle routes.
Sep
25-26
Sa - Su

Castle Race Series - Hever Castle

Triathlon Duathlon Aquathlon Triathlon 9-10 years 200 m 4.2 1.3 km Sprint 750 m 5 km Triathlon 11-12 years 300 m 4.2 1.8 km Triathlon 15-16 years 500 m 8.4 2.2 km
A multisport weekend at Hever Castle, Kent with triathlon, duathlon, aquabike, aquathlon, swim and run races, junior events and a festival village.
October 2027
Oct
23
Sa

London Aquathlon

Aquathlon London Aquathlon 400 m 5 km
A combined 400 m pool swim and 5 km run at the London Aquatics Centre and Queen Elizabeth Olympic Park on 23 October 2027.
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