Flat 5K runs in South East
Find flat 5k runs in South East 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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- Fri 26 Dec
- £16-£18
Boxing Day Challenge | 5K
Come and join the day of running and aim to complete a 5K at your own pace on a flat, out-and-back route along the River Thames then receive a bespoke medal and goody bag at the finish!
- Enter online
- Flat
- PB
- Traffic free
- Age 12 & over
- 5 km trail running + 0 ft ascent
- Sat 3 Jan 2026
- £16-£18
Rhino Run | 5K
Come and join the day of running and aim to complete a 5K at your own pace on an out-and-back route along an old railway line (quite flat) then receive a Rhino medal and goody bag at the finish!
- Enter online
- Flat
- PB
- Traffic free
- Age 12 & over
- 5 km trail running + 0 ft ascent
- Sun 3 May 2026
- £18-£28
MK Marathon Weekend | Rocket 5K
Shoot for the stars on the rapid Rocket Run! Join this fast rocket-fueled 5K with an 'out of this world' bling on a fast and flat point-to-point course from central Milton Keynes to Stadium MK.
- Chip timing
- Enter online
- Flat
- Undulating
- PB
- Traffic free
- Age 12 & over
- 5 km road running + 89 ft ascent
- Mon 4 May 2026
- £20-£27
Bank Holiday Madness May | 5K
Come and join the day of running and aim to complete a 5K at your own pace on a scenic course then receive a fantastic medal and goody bag at the finish!
- Enter online
- Flat
- Age 12 & over
- 5 km trail running + 0 ft 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 8 Nov 2026
- £25-£34
Remembrance Day Run | South | 5K
Your chance to remember those who have given the ultimate sacrifice during conflicts around the world, with a two-minute silence, 5K run, then a Remembrance medal and goody bag at the finish.
- Enter online
- Flat
- Age 12 & over
- 5 km trail running + 0 ft ascent
- Sun 15 Mar 2026
Milton Keynes Festival of Running | 5K
- 5 km road running
- Sun 22 Mar 2026
Run Whitstable & Herne Bay Spring 5K, 10K and Half Marathon | 5K
- 5 km road running
- Sat 9 May 2026
The All Nations 5K, 10K and Half Marathon Run | 5K
- 5 km road running
- Sun 13 Sep 2026
The Garmin New Forest Marathon | 5K
- 5 km multi terrain running + 50 ft ascent