London Marathon Explores Two-Day Format for 2027

Organizers of the London Marathon are in advanced discussions to potentially stage the 2027 event over two days, allowing up to 100,000 amateur runners to participate. This proposal, internally referred to as the "Double London Marathon," aims to accommodate the growing interest in the race, which saw a record 1.1 million applicants for the 2026 edition, a 36% increase from the previous year. The proposed dates for the two-day event are Saturday, April 24, and Sunday, April 25, 2027, with approximately 50,000 runners expected to compete each day.

The world’s largest marathon could be getting even bigger — here is why London could see 100,000 runners take to the streets next yearGB NewsThe GuardianChannel News Asia - CNAWill London Marathon become a two-day event?BBC News

The initiative has reportedly received backing from the Mayor of London, Sadiq Khan, although formal approval has yet to be granted. A spokesperson for the mayor stated, "London is the sporting capital of the world and the Mayor looks forward to working with London Marathon and partners to consider if it might be possible to host an event that will run across two days next year." The London Marathon Events team is actively collaborating with various stakeholders to explore this innovative approach, which could also see the elite men's and women's races held on separate days.

Will London Marathon become a two-day event?The GuardianGB NewsThe world’s largest marathon could be getting even bigger — here is why London could see 100,000 runners take to the streets next yearBBC News

The two-day format is anticipated to significantly boost fundraising efforts, with projections suggesting that it could raise over £130 million for charity, surpassing the £87.3 million raised in 2025. The London Marathon has established itself as the world's largest annual one-day fundraising event, and this expansion could further enhance its impact on local charities and the economy.

The Guardian

While the proposal has garnered enthusiasm, it has not been without skepticism. Some critics question the logistical challenges of managing such a large-scale event over two days, including the potential strain on city resources and infrastructure. Additionally, concerns have been raised about how the two-day format might affect the traditional marathon experience for participants and spectators alike.

The Guardian

A spokesperson for London Marathon Events emphasized the organization's commitment to exploring ways to increase participation: "The TCS London Marathon is the world's most popular marathon, and we are continually exploring innovative ways to enable more people to take part while delivering positive benefits for London." The immediate focus remains on the upcoming 2026 marathon scheduled for April 26, 2026, with organizers aiming to provide an exceptional experience for all participants.

BBC NewsWill London Marathon become a two-day event?The GuardianGB NewsThe world’s largest marathon could be getting even bigger — here is why London could see 100,000 runners take to the streets next year

As discussions continue, the London Marathon team is expected to finalize plans and seek necessary approvals in the coming months. The outcome of these talks will determine whether the 2027 event will indeed transition to a two-day format, potentially reshaping the future of this iconic race.

The world’s largest marathon could be getting even bigger — here is why London could see 100,000 runners take to the streets next year