How to Enter

Swimmers enter the water at Swim Serpentine

Online Entry

Enter Children with Cancer UK Swim Serpentine

Don't miss your chance to swim at the 2019 edition of Children with Cancer UK Swim Serpentine on Saturday 21 September. Limited spaces are still available in the half-mile and one-mile swim, and you can sign up via the buttons below.

Entries close at 17:00 on Thursday 22 August.

Why not use your place in the swim to raise money for charity? Check out a list of charities that have places and, once you have secured a place in the event, you can set up a fundraising page with Virgin Money Giving – it takes minutes and will make sure your charity receives even more of the money you raise.

Half-Mile Swim

This distance is an ideal entry level open water swim. Taking in half a lap of the Serpentine, there is plenty of time to swim this distance at your leisure with a friend, race your mum or dad or just to try out an open water swimming event with an achievable but for some still challenging swim. Entry costs £25 and entrants must be at least 12 years old on Saturday 21 September 2019.

One-Mile Swim

A one-mile swim is a classic distance in the world of open water swimming events. Children with Cancer UK Swim Serpentine takes place on the same course as the London 2012 Marathon Swimming Olympic event, with one full lap around the Serpentine making up the one-mile swim. This is the most popular of all the swim distances at Children with Cancer UK Swim Serpentine with swimmers taking anything from 20 minutes through to one hour to complete the swim. Entry costs £42 and entrants must be at least 16 years old on Saturday 21 September 2019.

Two-Mile Swim

General entry into the two-mile swim is now sold out. To find out how to secure a charity place in the event, please visit our Swim for Charity page.

Super Six event

The Super Six has now sold out.

Entry costs £150 for this epic challenge and swimmers must be at least 18 years old on Saturday 21 September 2019.

The London Classics

London Marathon Events have brought together the best marathon in the world, the world’s greatest cycling festival and the inspirational open water swimming event, Swim Serpentine, to create the London Classics, one of the world’s great sporting challenges.

The unique challenge requires participants to run the London Marathon, cycle 100 miles in the Prudential RideLondon-Surrey 100 and swim two miles at Swim Serpentine.

Visit our London Classics page for more information.

Swimmers with Disabilities

Swimmers with a disability are welcome to enter any of the events. If support or help on the day is needed, please contact

Wetsuit & tow-float hire

Wetsuits are optional when the water temperature is over 15 degrees. However, for safety reasons, all swimmers must either wear a wetsuit or use a tow-float for all Children with Cancer UK Swim Serpentine events.

Choosing your wave

The Children with Cancer UK Swim Serpentine events will comprise a number of waves (groups).

If you enter Children with Cancer UK Swim Serpentine, you will be able to choose your wave, so you'll be able to swim with friends and family if you’d like to. If you do not choose a wave, you will be allocated one according to your predicted finishing time.

Change of address

If you change your address after applying, please email with your name, date of birth, telephone number, old address and your new address.

Your address details will then be changed in our system and a confirmation will be emailed to you when this has been done.

Please do not call the helpdesk with changes of address as these can only be processed by email.

Age Group Prizes

Although the focus of the event is on having fun, prizes will be awarded to first, second and third-placed swimmers in each age category. Prizes will be sent out post-event.