Marathon Swims 2025

Marathon Swims returns to the London Aquatics Centre Saturday 8 November 2025.​

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ENTER London's marathon of swimming in 2025. Challenges include the Marathon 10k, Half Marathon 5k, 1k Challenge and Team 10k.​​

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Charity places:

Swim for our amazing charity partner Alzheimer's Society. Places currently available in all challenge distances. Fundraising from £150. Secure your place on the start line today.

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General entry:

General entry to the 1k Challenge is OPEN. General entry tickets for the Team 10k are SOLD OUT.

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Ballots:

Marathon Swims is heavily oversubscribed each year, so we operate a ballot as the fairest way of distributing the places. Ballots were operated for the Marathon 10k and Half Marathon 5k. The ballots were drawn on 2 April 2025.

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Entries to the ballot are free of charge. Payment details are taken at point of registration to the ballot. Only successful ballot entrants will have a payment taken. All successful entrants will be notified. All ballot entries have an equal chance. It does not matter when you enter the ballot, as long as you do so before the closing date. 

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Some successful entries on the ballot may have their payment fail. If this occurs the entrant will be given 5 days to pay the amount owed to claim their place. If the entry fee remains unpaid after 5 days, then the place will be cancelled and offered on a first come, first served basis to all unsuccessful ballot entrants.