Enter Now

Register for Open Water Swimathon 2018 and join Cancer Research UK and Marie Curie to raise as much money as possible for two causes close to the nation’s hearts. Open Water Swimathon will be returning for 2018 and will take place from Saturday 8th - Sunday 9th September. 

How to enter

If you have a Swimathon account, you can enter Open Water Swimathon 2018 here:


If you did not take part in Open Water Swimathon 2017, create your Open Water Swimathon account and enter Open Water Swimathon 2018.


Open Water Swimathon event weekend 
MySwimathon challenge

Saturday 8th - Sunday 9th September

Friday 31st August - Tuesday 16th September


This is your swim – from 400m to 5k, there is a challenge for you! 

IndividualTeam (2-5 people)

400m, 1.5k, 2.5k or 5k

1.5k or 5k 


Entry TypeStandardConcession**

Individual 400m, 1.5k, 2.5k or 5k



Team 1.5k & 5k*



* Teams can be made up of 2-5 people.

** Denotes concessionary price for unemployed, under 16s, disabled, full-time students and senior citizens aged 60 years and above. For team concessions, the majority (over half) must fall into one of these categories to qualify for the concessionary price. Teams are not separated into age specific categories. 


Open Water Swimathon takes place at 18 venues across the UK. Find your nearest venue here.  


At a time and a place that suits you. 

Be part of the Swimathon experience when you want and where you want with MySwimathon. By completing your challenge through MySwimathon, you have the option to complete your swim at any time from August 31st - September 16th at a venue of your choosing.

Please note, this is NOT part of an organised Open Water Swimathon session

Enter MySwimathon

What support is available?

You are not getting in the open water alone! From the moment you sign-up, you will receive: 

  • Communications from the Open Water Swimathon team, helping you and guiding you in the lead-up to the event weekend. 
  • Expert training plans will also be shared to ensure you are fully prepared for your challenge 
  • You can also join the community on Facebook, Twitter and Instagram