Flattest Marathons UK 2026: 13 Courses Ranked by Elevation

Among the live big-city marathons, Newport (the ABP Newport Wales Marathon) is the flattest, with only around 26 m of total elevation gain across the whole 26.2 miles and a route that never climbs far above sea level. The course was designed by double Olympic marathoner Steve Brace, and roughly 70% of finishers set a personal best there, which is why it features in Runner's World fast-course lists. Smaller club-style races such as Boston in Lincolnshire are flatter still, but Newport pairs a near-flat profile with a full big-event setup.

It depends on the field size you want around you. Newport (26 m) and Manchester (around 55 m, with roughly 40,000 runners) are the flattest, while Edinburgh reads slightly hillier on paper at about 120 m of gain but runs net-downhill to a coastal finish and has been voted the fastest marathon in the UK. For a Major-scale PB attempt, London (around 75 m) is mostly flat with the biggest crowds in the country. If you are choosing purely on the profile, see our deeper breakdown of the best UK marathon for a PB.

Mostly. London gains only around 75 m over the full distance with no sustained climbs, and the old cobbled section by the Tower of London was replaced with smooth tarmac back in 2005. The main complications are the tight turns and wind tunnels around Canary Wharf in the second half rather than any real hills, so it remains one of the fastest courses in the world. The catch is getting a place: most overseas and non-elite runners come through the ballot, since the Good For Age fast-track is open to UK residents only.

It is fast and gently rolling rather than dead flat. Chester climbs only about 80 m in total, with the quicker, flatter half running through the city and across the River Dee into Wales, and a few short rises returning in the closing miles. That puts it among the flatter UK marathons and makes it a popular autumn PB target, but it is not as relentlessly level as Newport or Manchester, so pace the back end with the late bumps in mind.

Both work; the choice is mostly about your training block and the weather you tolerate. Most of these flat races sit in spring: Brighton in early April, Newport and Manchester in mid-April, London in late April, and Edinburgh in late May, which suits runners who build through the winter. Chester in October is the standout autumn option, off a summer of mileage and often in cool, still conditions. Cooler air helps a flat profile pay off, so check the weather score for your race window before you commit.

No. A flat profile removes hills as a variable, but weather, headwinds, your pacing discipline, race-day crowds and how well you trained still decide the result. A flat course on a hot or gusty day can be slower than a gently rolling course in perfect conditions, so check the weather score for your race window and rehearse even splits before relying on the profile alone.

Often, yes. Brighton (around 145 m) and the coastal stretch of Edinburgh are relatively flat, but exposed seafront roads can carry a strong headwind that costs more time than a few gentle hills would. The trade-off is usually worth it for the flat footing, but plan to tuck into a group on the exposed sections rather than leading into the wind alone.