Ironman triathlons

Ironman triathlons

Full distance (aka 140.6) triathlon events | 2.4 mile swim + 112 mile bike + 26.2 mile run

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Ironman triathlons in the UK

An Ironman or full distance triathlon is one of the toughest event formats around and only do-able by the most committed athletes with both the physical and mental endurance to cross the finish line. Also called a 140.6 triathlon or full distance triathlon, these long-distance events involve a 2.4-mile swim (3.9km), a 112-mile bike ride (180km), and a 26.2-mile run (42.2km) - a total of 140.6 miles completed in an average of around 10-15 hours. Select your location for full distance triathlons in your area or scroll down to see major events coming up.

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Full distance triathlons in 2025

Featured events are listed below - select a month/region or the map view to see all events.

Race through the beautiful grounds and surrounding area of the stunning Château de Chantilly in The Bastion Iron Triathlon XXL then celebrate with friends and family in the festival village.
  • Sun 8 Jun
  • €375
Chantilly, France

Chateau de Chantilly | Bastion Triathlon

Race through the beautiful grounds and surrounding area of the stunning Château de Chantilly in The Bastion Iron Triathlon XXL then celebrate with friends and family in the festival village.

  • 3.8 km lake swimming
  • 180.2 km road cycling
  • 42.2 km road running
Complete your own Odyssey on a journey of self-discovery in the Cambridgeshire countryside featuring a swim in the River Ouse, a scenic ride and a run around the beautiful town of St Neots.
  • Sat 5 Jul
  • £275-£295
St. Neots, Cambridgeshire, UK

ATW Odyssey Full Distance Triathlon

Complete your own Odyssey on a journey of self-discovery in the Cambridgeshire countryside featuring a swim in the River Ouse, a scenic ride and a run around the beautiful town of St Neots.

  • 3800 m river swimming
  • 180 km road cycling
  • 42.2 km road running
Brand new to the popular Roadford Lake Tri, the Iron Tri has a superb swimming venue with quiet rolling roads for the bike course and a cracking run too. Plus there's lakeside camping available too.
  • Sun 31 Aug
  • £250
Lifton, Devon, UK

Roadford Lake Triathlon | Iron Distance

Brand new to the popular Roadford Lake Tri, the Iron Tri has a superb swimming venue with quiet rolling roads for the bike course and a cracking run too. Plus there's lakeside camping available too.

  • 3.8 km lake swimming
  • 185 km road cycling
  • 42 km road running

Ironman triathlons near you

Select your location for Ironman and 140.6 triathlons in your area.