Flat Ultra runs in UK
Find flat ultra runs in UK in 2026/2027 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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Select an event for photos, video, route, location, reviews, entry fees and how to enter.
- Sun 18 Oct
- £51.50
Brenig Way 50K Trail
This regional marked footpath of 32 miles winds it's way through some beautifully remote upland scenery. Start at the town of Corwen in the Dee Valley, and follow the signage up the Dee Valley.
- 50 km trail running + 1450 m ascent
- Sun 25 Oct
- £37.50-£39.50
Wight Lines
Enjoy stunning coastal views on this flexible-distance run at Milford on Sea, following an out-and-back route beside Sturt Pond and the Isle of Wight — perfect for all abilities.
- 7 hrs trail running + 47 ft ascent
- Sun 25 Oct
- £35-£55
Stort30
A stunningly pretty 30-mile out-and-back ultra on the border of Hertfordshire and Essex along the River Stort and Lee navigation. A great first foray into ultra running or a fast competitive race.
- 30 miles trail running + 188 ft ascent
- Sat 31 Oct
- £54-£56
Hubble Bubble & Ghostly 1 Mile | Ultra Marathon
A Halloween-themed ultra run you won't want to miss, bringing together runners of all abilities to share memories in what they love to do. Reach the finish to enjoy tasty Halloween treats.
- 32 miles trail running
- Sun 8 Nov
- £20-£37
Remembrance Run | South
Your chance to remember those who have given the ultimate sacrifice during conflicts around the world, with a two-minute silence and a run of your choice from 3K to ultra.
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sun 6 Dec
- £18-£34
The Snow Globe Gallop Bobble Hat Run | North
Come and join in the Snow Globe Gallop, get a few miles under your belt before the Christmas festivities really kick in plus you will get a bobble hat for all your effort!
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sat 26 Dec
- £16-£35
Boxing Day Challenge
Welcome to the 6-hour Boxing Day Challenge, where you can run the distance of your choice on an out-and-back route along the River Thames, with fuel stations, bespoke medal and goody bag.
- 5K run
- 10K run
- Half marathon
- Marathon
- Ultra run
- + 1 more race
- Sat 14 Feb
- £100
Trails & Tarmac Backyard Ultra - Winter
- 32 miles trail running
- Sat 7 Mar
- £65
Harrold-Odell Country Park Trail Run | 50K
- 50 km trail running
- Sun 22 Mar
- £25-£120
Canalathon-Ultra Running Festival
- 50K ultra run
- 100K ultra run
- Half marathon
- 10K run
- 5K run
- Sat 9 May
- £60
Westcountry Ultra Flat 50 Miler
- 50 miles trail running + 2128 ft ascent
- Sat 9 May
- £60
Westcountry Ultra Hilly 50 Miler
- 50 miles fell running + 7337 ft ascent
- Fri 11 - Sun 13 Sep
- £39-£199
Thames Path Ultra Challenge
- 100K ultra run 2
- 50K ultra run 2
- Trail run 4
- Charity walk 4
- Ultra run
- + 1 more race
- Sat 14 Nov
- £61.50
The Anglesey 3 Peaks Run Challenge
- 55 km trail running