24-hour world champion and world-record holder
Won the IAU championship in Albi with 278.622 km, finishing fifth in the combined field.
Source-checked athlete record · Updated Oct 12, 2026
Sarah Webster
24-hour world-record holder and 100 km medalist
Sarah Webster is a British ultrarunner who won the 2025 IAU 24-Hour World Championships with 278.622 km; the IAU ratified 278.621 km as the world record.
Great BritainLewes ACW45
The record so far
Sarah Webster is a British road and track ultrarunner who formerly represented Northern (Isle of Man) Athletic Club and now runs for Lewes AC. At the 2025 IAU 24-Hour World Championships in Albi, she recorded 278.622 km to win the women’s title; the IAU record list ratifies the mark as 278.621 km, and the IAU named her its 2025 Athlete of the Year.
The performance followed a rapid progression through international ultra distances. Webster won the Crawley 24-hour track race with 243.393 km in April 2025, took bronze at the 2024 IAU 100 km World Championships, set a European 100 km record at the 2024 Anglo Celtic Plate in Perth, and recorded 3:20:07 at the 2023 IAU 50 km World Championships.
Those results connect international-level speed at 50 km and 100 km with record-setting fixed-time endurance over 24 hours.
Defining performances
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IAU Athlete of the Year
Named the IAU’s 2025 Athlete of the Year after her 24-hour world title and world record.
Crawley 24-hour win and British records
Won the Crawley 24-hour track race outright with 243.393 km and passed 100 miles in 14:05:05; both marks were reported as British women’s records, subject to ratification.
European 100 km record
Ran 7:03:48 at the Anglo Celtic Plate in Perth to take the British 100 km title and break the European record by 15 seconds; the IAU record list gives the mark as 7:03:49.
IAU 100 km World Championships bronze
Placed third in Bengaluru in 7:19:18 as part of Great Britain’s international team.
Performance history
| Date | Event | Performance | Result | Source |
|---|---|---|---|---|
| South Downs Way 100100-mile trail | 14:27:34 | Winner · 6th overall | View ↗ | |
| 100 km del Conero100 km road | 7:03:48 | Winner · 4th overall | View ↗ | |
| IAU 24-Hour World Championships24-hour race | 278.622 km | World champion · world record | View ↗ | |
| Crawley A.I.M. Charity 24 Hour24-hour race | 243.393 km | Overall winner | View ↗ | |
| IAU 100 km World Championships100 km road | 7:19:18 | 3rd woman | View ↗ | |
| Anglo Celtic Plate 100 km100 km roadThe IAU record list gives the European record as 7:03:49. | 7:03:48 | 1st woman · European record | View ↗ | |
| IAU 50 km World Championships50 km road | 3:20:07 | 3rd woman · GB team gold | View ↗ |
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