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 Triathlon and Multisport Festival | Triathlon Bastion

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
Saint 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.

  • 3.8 km river swimming
  • 180 km road cycling
  • 26.2 miles road running
A gruelling Ironman-style challenge set over a weekend starting with a 2.4-Mile Swim on Friday, 112-Mile Sportive on Saturday then a Marathon on Sunday, supported by the best crowds you'll ever find.
  • Fri 29 - Sun 31 Aug
  • £279
Masham, North Yorkshire, UK

Full Long Course Weekend

A gruelling Ironman-style challenge set over a weekend starting with a 2.4-Mile Swim on Friday, 112-Mile Sportive on Saturday then a Marathon on Sunday, supported by the best crowds you'll ever find.

  • 2.4 miles lake swimming
  • 112 miles road cycling
  • 26.2 miles road running

Ironman triathlons near you

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