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Triathlons

By far the most popular multidisciplinary sport, a triathlon combines swimming, cycling and running in sequence. There are five officially recognised distances and plenty more for the fun of it. Whether it’s your very first triathlon or your 50th, there are incredible events for all levels running up and down the whole country. Find hundreds of the best UK triathlon events on Let’s Do This, with races to book for every level. No matter which time of the year you’re looking to compete, discover triathlons near you today.

111 events found
Stradbroke Triathlon & Junior Aquathlon

Sunday, 21 May 2023

Stradbroke Triathlon & Junior Aquathlon

LocationIndicator

Stradbroke, Suffolk

Participants

super sprint

Star5

(1 reviews)

FilledTicket£5 – £40
Booking perksGreat atmosphereRoad
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Swansea Triathlon, Swim & 5k
Booked 2 times this week

Saturday, 27 May 2023

Swansea Triathlon, Swim & 5k

LocationIndicator

Swansea, Swansea

Participants

5k, sprint, medium (2–5km), short (0–2km)

FilledTicket£20 – £110
Booking perksFlat road
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RunThrough Dorney Evening Triathlon - May

Wednesday, 31 May 2023

RunThrough Dorney Evening Triathlon - May

LocationIndicator

Dorney, Buckinghamshire

Participants

sprint, super sprint

FilledTicket£55 – £76
Booking perksFlat road
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Bristol Triathlon
Booked 5 times this week

Sunday, 4 Jun 2023

Bristol Triathlon

LocationIndicator

Bristol, Bristol City

Participants

sprint

Star4

(110 reviews)

FilledTicket£83.99 – £120
Booking perksGreat atmosphere
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Slateman Triathlon & Duathlon 2023

Saturday, 10 Jun 2023

Slateman Triathlon & Duathlon 2023

LocationIndicator

Llanberis, Gwynedd

Participants

olympic, sprint, half ironman, super sprint, short (0–2km), medium (2–5km)

Star5

(4 reviews)

FilledTicket£27.33 – £199
Booking perksGreat atmosphereGreat sceneryHilly trail
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Fareham Triathlon Series
Booked 2 times this week

Saturday, 10 Jun 2023

Fareham Triathlon Series

LocationIndicator

Fareham, Hampshire

Participants

sprint

FilledTicket£20 – £50
Booking perksFlat trail
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Dorney Triathlon - June
Booked 1 time this week

Saturday, 10 Jun 2023

Dorney Triathlon - June

LocationIndicator

Windsor, Buckinghamshire

Participants

sprint, super sprint, olympic

FilledTicket£60 – £105
Booking perksGreat sceneryFlat road
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Eastbourne Triathlon
Booked 2 times this week

Saturday, 10 Jun 2023

Eastbourne Triathlon

LocationIndicator

Eastbourne, East Sussex

Participants

5k, sprint, short (0–2km)

Star4.5

(4 reviews)

FilledTicket£30 – £144
Booking perksGreat atmosphereGreat sceneryFlat
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Fishguard Sprint Triathlon

Saturday, 10 Jun 2023

Fishguard Sprint Triathlon

LocationIndicator

Fishguard, Pembrokeshire

Participants

super sprint

FilledTicket£69.95 – £110
Booking perksGreat sceneryFlat trail
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Challenge Wales

Sunday, 11 Jun 2023

Challenge Wales

LocationIndicator

Fishguard, Pembrokeshire

Participants

half ironman, sprint

FilledTicket£199 – £399
Booking perksRoad
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Staunton Harold Triathlon & Children's Aquathlons
Booked 8 times this week

Sunday, 11 Jun 2023

Staunton Harold Triathlon & Children's Aquathlons

LocationIndicator

Ashby-de-la-Zouch, Leicestershire

Participants

sprint, super sprint, olympic

Star5

(1 reviews)

FilledTicket£20 – £100
Booking perksGreat atmosphereGreat scenery
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Cromhall Evening Tri Series - June
Booked 1 time this week

Wednesday, 14 Jun 2023

Cromhall Evening Tri Series - June

LocationIndicator

Cromhall, South Gloucestershire

Participants

sprint, super sprint

Star5

(6 reviews)

FilledTicket£15 – £35
Booking perksGreat atmosphereFlat
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Wildflower Triathlon
Booked 3 times this week

Sunday, 18 Jun 2023

Wildflower Triathlon

LocationIndicator

Llanarthne, Carmarthenshire

Participants

sprint

FilledTicket£69.99 – £75.99
Booking perksRoad
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Wild Boar Middle Distance & Olympic 2023
Booked 2 times this week

Sunday, 18 Jun 2023

Wild Boar Middle Distance & Olympic 2023

LocationIndicator

Wotton-under-Edge, South Gloucestershire

Participants

super sprint, half ironman

FilledTicket£70 – £90
Booking perksGreat sceneryHilly trail
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Sandbanks Sprint Triathlon - June

Sunday, 18 Jun 2023

Sandbanks Sprint Triathlon - June

LocationIndicator

Poole, Dorset

Participants

5k, sprint

FilledTicket£30 – £75
Booking perksFlat road
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The 14th Dartford Bridge Triathlon

Sunday, 18 Jun 2023

The 14th Dartford Bridge Triathlon

LocationIndicator

Dartford, Kent

Participants

olympic, super sprint, sprint

FilledTicket£26.67 – £67
Booking perks
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Cardiff Triathlon & Duathlon 2023
Booked 3 times this week

Sunday, 25 Jun 2023

Cardiff Triathlon & Duathlon 2023

LocationIndicator

Cardiff, Cardiff

Participants

olympic, sprint, super sprint

Star4.5

(28 reviews)

FilledTicket£37 – £205
Booking perksGreat atmosphereRoad
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Eton Dorney Triathlons - June
Booked 5 times this week

Sunday, 25 Jun 2023

Eton Dorney Triathlons - June

LocationIndicator

Windsor, Buckinghamshire

Participants

super sprint, sprint, olympic

Star4.5

(39 reviews)

FilledTicket£25 – £75
Booking perksGreat atmosphereFlat road
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Superleague Triathlon - June

Friday, 30 Jun 2023

Superleague Triathlon - June

LocationIndicator

Bradley Stoke, South Gloucestershire

FilledTicket£20 – £35
Booking perksRoad
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The Long Course Weekend – Wales

Friday, 30 Jun 2023

The Long Course Weekend – Wales

LocationIndicator

Tenby, Pembrokeshire

Participants

marathon, half marathon, 10k, 5k, ironman, sprint, half ironman

FilledTicket£10 – £349
Booking perksFlat
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Natures Way Foods Chichester Triathlon Series Weekend
Booked 5 times this week

Saturday, 1 Jul 2023

Natures Way Foods Chichester Triathlon Series Weekend

LocationIndicator

Chichester, West Sussex

Participants

olympic, sprint

FilledTicket£15 – £60
Booking perksTrail
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The Northumbrian

Sunday, 2 Jul 2023

The Northumbrian

LocationIndicator

Hexham, Northumberland

Participants

ironman, half ironman

FilledTicket£73.34 – £305
Booking perks
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Hitchin Triathlon
Booked 6 times this week

Sunday, 2 Jul 2023

Hitchin Triathlon

LocationIndicator

Hitchin, Hertfordshire

Participants

sprint, super sprint

FilledTicket£20 – £55
Booking perksRoad
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RunThrough Dorney Evening Triathlon - July

Wednesday, 5 Jul 2023

RunThrough Dorney Evening Triathlon - July

LocationIndicator

Dorney, Buckinghamshire

Participants

sprint, super sprint

FilledTicket£55 – £76
Booking perksFlat road
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Showing 25 - 48 of 120 events

Triathlons in the UK

The triathlon is a multi-sport event combining swimming, cycling and running. The length and duration of these events can vary greatly, ranging from just a few miles to 140 plus. In addition, conditions in competition can differ from event to event. The swim could be in an indoor pool or the sea, and cycling or running on flat coastal roads or rolling countryside hills.

The UK plays host to some of the best triathlon events in the world. Large scale events such as the ITU Worlds Triathlon Leeds and London Triathlon host athletes of all levels of experience with big crowds building a buzzing atmosphere.

What’s the best UK triathlon event for me?

On Let's Do This, you can refine your search for a triathlon by exploring different race distances.

The Super-Sprint distance (400m, 10k, 2.5k) and Sprint distance (750m, 20k, 5k) triathlons are great for beginners looking to explore multi-sport. These events can be attempted without much prior training. But if you want to be competitive you should practice your transitions as they can make a big difference to your time.

Olympic distance triathlons (1.5k, 40k, 10k) are the standard distance for international competition. To be competitive here, you’ll need to take your training seriously. If you can finish one of these in under 3 hours, kudos to you.

The final two distances are the Middle Distance / Half Ironman (1.9k, 90k, 21.1k) and the Full Distance / Ironman (3.8k, 180k, 42.2k). Finishing these events is an achievement in itself. If you have trained well for a Half Ironman you could be pushing for under 6 hours for men and 7 for women. For the full distance, anything under the 17hr cut off point is a solid accomplishment, but under 13 hours (men) and 14 hours (women) deserves serious respect.

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