Boston vs London: The Two Hardest Bibs in the Majors

Boston and London reject applicants in completely different ways, and that difference is the whole story. Boston has no ballot. Every one of its roughly 30,000 bibs goes to a runner who beat a qualifying standard, and even that is not enough in a strong year. London has no qualifying standard for its main route. Its 2027 ballot drew a record 1,338,544 applications for a field that London Marathon Events has never given an official acceptance rate for.

What makes Boston hard to get into?

Fitness, then luck of a different kind. The 2027 standards run from 2:55:00 for men aged 18 to 34 down to 5:20:00 for the oldest women's band, and clearing the number only earns an application, not a bib. Boston ranks every qualified applicant by how far under standard they ran and accepts the fastest first, so the slowest accepted time becomes the real cutoff after the fact. For the 2026 race that cutoff landed 4 minutes 34 seconds under standard, and 8,887 runners who had legitimately qualified were still turned away out of 33,249 who applied. New for 2027, Boston Qualifier Selection adds a random draw for roughly 1,000 additional spots for qualifiers who missed the cutoff, the first time any chance element has touched the Boston field. Full mechanics are in the Boston cutoff explained.

What makes London hard to get into?

Volume, not speed. London's public ballot has no qualifying standard at all: anyone can apply, which is exactly why 1,338,544 people did for 2027, an 18% jump on the previous year's record and a fourth consecutive world record. London Marathon Events did not publish a bib allocation or acceptance rate for that draw. The last confirmed figure, from an earlier and smaller ballot, was roughly 1.3%. There is an optional "double your chances" add-on: paying £49.99 upfront enters an unsuccessful applicant into a second draw, and anyone who misses both still gets a hydration vest worth over £100 for the trouble.

Do both races have a fast-track that works the same way?

Yes, and this is the part most comparisons miss. Boston's qualifying standard and London's Good for Age route use the identical mechanic: rank every applicant by margin under a published time, then fill a fixed number of places from the top down. London's GFA cap is 6,000 places, split evenly by gender, at standards of sub-2:52:00 for men and sub-3:38:00 for women aged 18 to 39. Just like Boston, clearing the published GFA time does not guarantee a place if more qualifiers apply than there is room for in a given age and gender band. Details are in London Marathon Good For Age, explained.

Which race is the bigger long shot?

By the numbers, London. A published rate near 1.3% is worse odds than most Boston qualifiers ever face once they have the standard in hand, since Boston's cutoff buffer has stayed in a roughly four-to-seven-minute band the last three cycles rather than rejecting the majority of applicants outright. But Boston's real barrier sits earlier: most runners never clear the qualifying time at all, which the ballot odds do not capture. London rejects fast and slow runners at close to the same rate. Boston rejects almost everyone before the cutoff math even starts.

Which one should you target first?

If you already hold a Boston qualifying time, register the moment the window opens on September 14, 2026, and check your buffer against the last three years of cutoffs with the BQ Buffer Calculator before you do. If you do not, London's ballot costs nothing but a shot at 1.3% odds, best modeled with the Marathon Ballot Simulator across repeat entries. Full race pages: Boston and London.

Sources: Boston Athletic Association: qualify for the Boston Marathon, BAA: 130th Boston Marathon qualifiers, London Marathon Events: record 1.33 million applications, London Marathon Events: enter the ballot