You’re breezing through those 5Ks.
You’re consistent with your long runs.
And now, the 26.2-mile challenge is calling your name.
Committing to a marathon is about levelling up. Chasing an exciting new milestone. And if you’re going to run that far – that fast – you should at least choose a race that delivers on atmosphere, speed, and euphoria, right?
Here are the best marathons in the UK for a PB – the races that will get you across the finish line feeling stronger and faster than ever before.
The London Marathon
Why it’s a must-run: This one’s legendary for a reason. The London Marathon isn’t just a race; it’s a global event known for its electric atmosphere. The crowd support is exhilarating, providing non-stop energy from Greenwich all the way to The Mall.
The PB potential: Famous for being fast and flat, this is one of the best marathons in the UK for a PB. You’ll barely feel the miles race by as you pass iconic sights like Big Ben and Buckingham Palace. If you want a phenomenal PB while, essentially, running through a huge street party, this is for you.
The vibe: Iconic. Energising. World-class.
The Boston Marathon (Lincolnshire)
Why it’s a must-run: Often cited as one of the UK's flattest marathons, the Boston Marathon is the ultimate ‘no distractions, just speed’ race. Perfect for runners driven by time goals and those super speedy PB attempts.
The PB potential: With virtually no elevation change, this course is literally pancake-flat. This allows for consistent pacing, and makes it a guaranteed fast environment – away from the chaos of major city races.
The vibe: Dedicated. Focused. Undisturbed.
The Edinburgh Marathon
Why it’s a must-run: Mixing stunning views with a surprisingly fast course, Edinburgh offers a quintessential run through history. You’ll start in the city centre, enjoy sights of Holyrood Park, and finish near the coast.
The PB potential: The initial miles are quick, and the course has a significant amount of downhill in the second half. This is your chance to save some fuel for a fantastic fast finish.
The vibe: Picturesque. Historic. Breezy.
The Manchester Marathon
Why it’s a must-run: If your sole focus is running your fastest time, look no further. Manchester is up there as one of the flattest major marathons in the UK (aka perfect for PBs).
The PB potential: Its gentle profile means less climb and more consistent pacing, making it the best marathon in the UK for a PB. Expect wide roads and a relentless focus on getting you to the finish line quickly.
The vibe: Serious runners. Serious speed. Serious PBs.
Did you know? URUNN’s very own Adam Clarke won the Manchester Marathon in 2024.
The Brighton Marathon
Why it’s a must-run: Also known as ‘Mini-London’, Brighton offers huge crowds, vibrant energy, and a beautiful seaside setting.
The PB potential: The course is largely flat, winding through the city and out along the coast. It’s fast enough for a PB, but its main draw is the atmosphere *and* the incredible feeling of crossing the finish line right on the seafront.
The vibe: Coastal. Charming. Buzzy.
The ABP Newport Wales Marathon
Why it’s a must-run: A fast Welsh gem, this course was designed by double Olympic marathon runner Steve Brace. It’s undoubtedly one of the flattests marathons in the UK – with tons of PBs to its name.
The PB potential: This course is exceptionally flat, meaning you can settle into a rhythm quickly and maintain it without many elevation interruptions. The unique mix of city sights and coastal paths is fast and scenic.
The vibe: Flat. Rhythmic. Stunning.
Choosing the best marathon in the UK for a PB is the first step. The next is locking in the ultra-personalised training that gets you ready for it.
With tailored plans designed by Olympic legends like Sir Mo Farah, URUNN has you covered for every one of those 26.2 miles.
Start prepping for that PB today. Download URUNN now.
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