Flat Half marathons in South East
Find flat half marathons 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 5 Dec
- £20-£27
The Christmas Jumper Jaunt | Half Marathon
Join a December midweek half marathon and wear your most over-the-top Christmas jumper (optional) then receive a themed medal and goody bag too!
- Enter online
- Flat
- Age 17 & over
- 13.1 miles trail running + 0 ft ascent
- Sat 6 Dec
- £28-£40
A Christmas Carol Bobble Hat Run | Half Marathon
Welcome to a 7-hour timed running event where you can run a half marathon at your own pace on an out-and-back route, with fuel stations each lap, and a bobble hat, medal and goody bag at the finish.
- Enter online
- Flat
- Age 17 & over
- 13.1 miles trail running + 0 ft ascent
- Fri 26 Dec
- £33-£35
Boxing Day Challenge | Half Marathon
Come and join the day of running and aim to complete a half marathon 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
- Traffic free
- Age 17 & over
- 13.1 miles trail running + 0 ft ascent
- Sun 15 Feb 2026
- £35-£37
Hampton Court Half Marathon
This is the original Hampton Court Half Marathon and is run over a fast, flat and interesting course that borders the river-side grounds of the magnificent palace with King Henry VIII cheering on!
- Venue accessible
- Newcomers
- Dogs allowed at venue
- Entertainment
- Music
- Chip timing
- Enter online
- Flat
- PB
- Fancy dress
- Event village
- Rural
- Free venue entry
- Age 17 & over
- 13.1 miles road running
- Sat 21 Feb 2026
- £43-£45
Magna Carta Winter | Half Marathon
The Magna Carta Half Marathon is based in scenic Runnymede right near the historic site where the treaty of Magna Carta was agreed by King John of England and signed on 15th June 1215.
- Chip timing
- Enter online
- Flat
- Traffic free
- Age 17-80
- 13.1 miles trail running + 110 ft ascent
- Sun 29 Mar 2026
- £31
Brett Lydd Half Marathon
A delectable racing experience perfect for those planning a spring marathon, over a pancake flat course using the wide, quiet country lanes surrounding the marsh town of Lydd in Kent.
- Chip timing
- Enter online
- Flat
- PB
- Age 17 & over
- 13.1 miles road running + 0 ft ascent
- Sun 3 May 2026
- £36-£42
- 3 charities
Worthing RUNFEST Half Marathon
Enjoy a fully closed road race, on flat coastal roads with a spectacular seafront finish. Chance to take home a PB along with the finishers' t-shirt and medal.
- Chip timing
- Enter online
- Flat
- PB
- Traffic free
- Age 17 & over
- 13.1 miles road running + 37 m ascent
- Mon 4 May 2026
- £20-£27
Bank Holiday Madness May | Half Marathon
Come and join the day of running and aim to complete a midweek half marathon within the 7-hour time limit on a scenic course then receive a fantastic medal and goody bag at the finish!
- Enter online
- Flat
- Age 17 & over
- 13.1 miles trail running + 0 ft ascent
- Mon 4 May 2026
- £40-£50
MK Half Marathon
A popular, fast, scenic AIMS-certified race, with BARR Gold accreditation for outstanding race management featuring beautiful lakes, parks, and picturesque villages with the highest level of support.
- Chip timing
- Enter online
- GPS tracking
- Flat
- PB
- Traffic free
- Age 17 & over
- 13.1 miles road running + 518 ft ascent
- Sun 27 Sep 2026
- £25-£27
Folkestone Rotary Half Marathon
This ever popular race promises amazing coastal views and a relatively flat coastal promenade run with real PB potential.
- Chip timing
- Enter online
- Flat
- PB
- Age 17 & over
- 13.1 miles road running + 469 ft ascent
- Sun 11 Oct 2026
- £15-£117
- 7 charities
Oxford Half Marathon
Runners will enjoy the fast, flat and beautiful route through University Parks and the historic Oxford City Centre whilst celebrating running and movement with entertainment and cheering fans!
- Carbon neutral
- Venue accessible
- Recycling
- Newcomers
- Entertainment
- Chip timing
- Enter online
- Flat
- PB
- Traffic free
- Fancy dress
- Event village
- Urban
- Park
- Sustainability policy
- Public transport links
- Age 16 & over
- 13.1 miles road running
- 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.
- Newcomers
- Enter online
- Flat
- Event village
- Coast
- Public transport links
- Age 18 & over
- 7 hrs trail running + 47 ft ascent
- Sun 7 Dec
Running GP at Goodwood Motor Circuit
- 5K run
- 10K run
- Half marathon 2
- Marathon
- 50K ultra run
- Sun 7 Dec
Milton Keynes Winter Half Marathon
- 13.1 miles road running + 415 ft ascent
- Sun 21 Dec
Portsmouth Coastal Waterside Marathon Events | Festive Half Marathon
- 13.1 miles multi terrain running
- Sun 28 Dec
Year End Marathon & Half Marathon | Half Marathon
- 13.1 miles trail running
- Sun 8 Feb 2026
Farnborough Winter Half Marathon | Half Marathon
- 13.1 miles road running + 393 ft ascent
- Sun 22 Feb 2026
David Cliff Wokingham Half Marathon | Half Marathon
- 13.1 miles road running
- Sun 8 Mar 2026
Lambert & Foster Paddock Wood Half Marathon
- 13.1 miles road running
- Sun 15 Mar 2026
Milton Keynes Festival of Running | Half Marathon
- 13.1 miles road running
- Sun 22 Mar 2026
Run Whitstable & Herne Bay Spring 5K, 10K and Half Marathon | Half Marathon
- 13.1 miles road running
- Sun 22 Mar 2026
Twin Lakes 20 | 20 Mile
- 20 miles multi terrain running
- Sat 9 May 2026
The All Nations 5K, 10K and Half Marathon Run | Half Marathon
- 13.1 miles road running
- Sat 23 May 2026
Seven Sisters Half Marathon
- 13.1 miles trail running + 2057 ft ascent
- Sun 13 Sep 2026
The Garmin New Forest Marathon | Half Marathon
- 13.1 miles multi terrain running + 150 ft ascent