London Marathon Events (LME) announced on Friday, June 19, that the TCS London Marathon 2027 will expand into a two-day event. Taking place on Saturday, April 24 and Sunday, April 25, 2027, this one-off format will allow 100,000 runners to cross the iconic finish line on The Mall over the course of the weekend.London Marathon Events has said this is a “one-off format change.” Runners on both days will take on the same 26.2-mile route from Greenwich to Westminster. The double event allows more runners than ever to take part, helping meet the demand for places after 1.33 million people entered the ballot for the 2027 race.The results of the ballot will be announced in July, with successful runners randomly assigned to either the Saturday or the Sunday race. Participants will not be allowed to take part in the in-person event on both days.The TCS London Marathon 2026 proved to be one of the most historic editions in the race's history, with Kenya's Sabastian Sawe becoming the first athlete to run a sub-two-hour marathon in a competitive race, crossing the line in 1:59:30. Even more astounding was the fact that he wasn't alone in this victory, with Ethiopia's Yomif Kejelcha finishing second in 1:59:41.
TCS London Marathon 2027 will be a two-day event, allowing 100,000 runners to cross the finish line in a unique double-format race
I've run the London Marathon five times. Here's why it matters
TL;DRAI
London Marathon 2027 becomes a two-day event (April 24-25) with 100,000 runners, generating £150m charity and £400m economic impact. Managing 100k registrations and logistics mirrors infrastructure scaling tech leaders solve in distributed operations.
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