Flat Ultra runs in UK
Find flat ultra runs in UK in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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MapEvent listings
Select an event for photos, video, route, location, reviews, entry fees and how to enter.
- Sat 19 Sep 2026
- £54-£56
Oktoberfest | Ultra Marathon
Get your Oompah vibe on and enjoy a trip up the Leeds and Liverpool Canal. An ultra marathon to warm the depths of your heart along the flat, even towpath - this event is perfect for all abilities.
- Chip timing
- Enter online
- Flat
- PB
- Age 21 & over
- 33 miles trail running + 243 ft ascent
- Sun 27 Sep 2026
- £37.50-£39.50
SoBo Series | Volume 4 | Stop me (if you think you've heard this one before)
Set along the beachfront promenade at Southbourne (SoBo), choose your own distance from 5K to ultra, along this flat, tarmacked, lapped route suitable for all abilities.
- Beginner-friendly
- Enter online
- Flat
- Traffic free
- Event village
- Coast
- Public transport links
- Age 18 & over
- 7 hrs road running
- Sun 18 Oct 2026
- £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.
- Beginner-friendly
- Enter online
- GPS tracking
- Flat
- Event village
- Rural
- Age 18 & over
- 50 km trail running + 1450 m ascent
- Sun 25 Oct 2026
- £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.
- Beginner-friendly
- Enter online
- Flat
- Event village
- Coast
- Public transport links
- Age 18 & over
- 7 hrs trail running + 47 ft ascent
- Sun 25 Oct 2026
- £35
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.
- Beginner-friendly
- Chip timing
- Enter online
- Flat
- Event village
- Rural
- Age 18 & over
- 30 miles trail running + 188 ft ascent
- Sat 31 Oct 2026
- £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.
- Enter online
- Flat
- PB
- Traffic free
- Age 21 & over
- 32 miles trail running
- Sun 8 Nov 2026
- £20-£37
Remembrance Day 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.
- Families
- Beginner-friendly
- Event village
- All ages
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sun 6 Dec 2026
- £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!
- Families
- Beginner-friendly
- Event village
- All ages
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sun 21 Dec
Portsmouth Coastal Waterside Marathon Events | 50K Ultra
- 50 km multi terrain running
- Sun 22 Mar 2026
Canalathon-Ultra Running Festival
- 50K ultra run
- 100K ultra run
- Half marathon
- 10K run
- Fri 11 - Sun 13 Sep 2026
Thames Path Ultra Challenge
- 100K ultra run 2
- 50K ultra run 2
- Trail run 4
- Charity walk 4
- Ultra run
- + 1 more race