London Marathon course · Source checked 11 September 2026
London Marathon course: route, hills and pacing
London begins from separate starts around Greenwich and Blackheath, merges before mile three in Woolwich, passes Cutty Sark between miles six and seven, crosses Tower Bridge near halfway, loops east through Canary Wharf, then returns along The Highway and Victoria Embankment to finish on The Mall.
The route is broadly favourable for even finish-time planning, but it is not one uninterrupted flat line. The early net descent, merge congestion, Tower Bridge approach, turns and uncertain GPS in Canary Wharf, and the long final run west all change how a steady target looks on the road.
The London course by segment
London Marathon Events publishes this sequence on its current course page. The table turns that official overview into decision points without presenting the older event-guide map as a confirmed 2027 street plan.
| Section | What the organiser describes | Useful decision |
|---|---|---|
| Starts–mile 3 | Three start lines feed into one route just before mile three in Woolwich. The roads are wide and net downhill, but the merge can be crowded. | Follow the assigned start and judge the opening by cumulative time. Extra distance from weaving is not part of the measured marathon. |
| Miles 3–7 | The joined route turns west through Charlton and Greenwich, looping around Cutty Sark between miles six and seven. | Use Cutty Sark as a location check, then use the next official marker for time. A landmark is not an exact split line. |
| Miles 7–14 | The course continues through Deptford, Rotherhithe and Jamaica Road in Bermondsey, then crosses Tower Bridge toward halfway. The organiser calls miles four to 14 relatively flat, with a small net negative elevation and an incline before the bridge. | Tower Bridge can feel like a midpoint celebration, but keep the half-marathon timing mat as the exact halfway reference. |
| Miles 15–20 | North of the Thames, the course heads east along The Highway to Westferry and circles through Mudchute, Docklands and Canary Wharf. Tall buildings, narrow streets, the Westferry Underpass and turns can affect GPS and rhythm. | Read official mile markers and cumulative elapsed time. Chasing a sudden watch-pace change can create a real change in effort from a measurement error. |
| Miles 21–24 | Rainbow Row sits just after mile 21 in Limehouse. The route returns along The Highway, passes Tower Hill and continues onto Victoria Embankment. | Recognise the returning road without mistaking the nearby Tower Bridge area for the finish. Reassess the remaining distance at the official marker. |
| Miles 24–finish | The final approach follows Victoria Embankment to Parliament Square, turns onto Birdcage Walk, passes Buckingham Palace and makes the final turn onto The Mall. | The organiser places the one-kilometre-to-go point on Birdcage Walk. Hold the finish calculation to that marker, not the first sight of Buckingham Palace. |
Is the London Marathon flat?
The current official course page describes the first three miles as net downhill and miles four to 14 as relatively flat with a small net loss. It also flags the incline before Tower Bridge and a favourable section from Tower Hill to Victoria Embankment. Those are relative descriptions, not a complete elevation dataset.
The inspected 2026 participant guide contains an edition-specific route map, but the organiser has not yet published a detailed 2027 map in the sources reviewed here. Check the route year and measurement method behind any elevation total before using it for a comparison or pacing decision. The relative profile is useful for planning the opening descent and later changes of rhythm; it does not supply a precise time adjustment.
Use the London race page’s route source status and replace any saved route file when London Marathon Events publishes its 2027 participant material.
Pacing for London's key sections
Set your checkpoint times
Use the marathon pace chart to turn a chosen finish target into 5K and halfway splits. The even row is a baseline for comparison, not a prediction or a rule that each mile must match.
Let the first merge settle
The separate starts join before mile three, where the organiser warns of crowding and a descent. A clean line and a controlled opening preserve the meaning of the later cumulative checks; there is no need to recover seconds lost to normal congestion immediately.
Keep Tower Bridge in proportion
Tower Bridge is a strong visual and crowd landmark near halfway. It is still the beginning of the eastward Docklands section, not the point to assume the hard decisions are over.
Use markers through Canary Wharf
The organiser explicitly warns that tall buildings and the underpass can disrupt GPS. Compare official mile signs with elapsed time, and do not accelerate solely because the watch briefly reports a slower pace.
Common marker and route confusion
- The coloured starts differ at first. The current overview says three routes merge just before mile three. Your participant instructions, rather than another runner’s map, determine the correct assembly area and opening streets.
- Cutty Sark is between miles six and seven. It is a useful orientation point, but the nearby crowd does not define a measured split.
- Tower Bridge is toward halfway. Cross the bridge, then use the official half-marathon mat for the exact 21.0975K comparison.
- You encounter The Highway in both directions. After Tower Bridge the route heads east; in the final five miles it returns west toward Tower Hill and Embankment.
- GPS can be weakest where pacing feels least simple. Canary Wharf’s tall buildings, narrow roads and the Westferry Underpass are named by the organiser as problem areas. Official markers are the better distance reference.
- Buckingham Palace is the final turn, not the line. The course turns onto The Mall before reaching the finish.
What is known about the 2027 double
The official FAQ states that the two marathon days are Saturday 24 and Sunday 25 April 2027 and that both use the same route from Greenwich to Westminster. Entrants can run only one day, and an allocated day cannot be changed. The FAQ also says the male and female Elite, Championship and Good For Age races will be split across the two days, with more scheduling detail due at the end of September.
This confirms the shared 2027 route corridor, but it does not assign every entrant to a day or publish the detailed street geometry in the inspected sources. Keep both the route file and calendar day provisional until the organiser confirms them for your entry. The London entry guide covers the separate entry-route decisions.
The finish arrangements are not identical. The organiser says the main finish closes at 17:30 on Saturday, with a maximum of 7 hours 45 minutes from each participant's allotted start. On Sunday, a secondary finish in Green Park remains open until 23:59:59. Check your assigned day and instructions rather than assuming that every Sunday finisher will finish on The Mall.
Take the course into your race plan
Save the exact London edition from the London race page and track its assigned day in My Season. Use the marathon pace chart for your finish target and checkpoint times and training resources for source-linked preparation. Recheck the official course and 2027 FAQ when participant instructions arrive; they supersede historical maps and general guide copy.
Sources and review
Prepared by RaceIndex with AI-assisted source research. Pacing decisions are editorial interpretation of the sourced route.
- London Marathon Events course overview — route sequence, landmarks, relative profile, marker and GPS guidance.
- 2027 TCS London Marathon Double FAQs — dates, same-route statement and outstanding day arrangements.
- Official 2026 participant guide — edition-labelled historical route and finish context.
Sources checked . Recheck after the organiser’s promised late-September scheduling update and when the detailed 2027 participant guide is published.