The route, which runs along the busy A34 between Kennington and Oxford, was upgraded with resurfacing work and the removal or modification of obstructive barriers and cattle grids.
The project is being delivered between the Cowley Branch Line and Sandford Lane to reduce congestion on the A34, making it easier for people to walk or cycle into Oxford.
Highways England and the European Agricultural Fund for Rural Development are supporting the project with funding.
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James Cleeton, Sustrans Director, England South said: "We are delighted to be partnering with Highways England and welcome this investment that will make it easier for more people to walk or cycle for their everyday journeys.
"The surface on this section of the National Cycle Network is not up to scratch and currently floods in bad weather. This work will make it possible to use the route year-round.
"Removing barriers and cattle grids will make it far easier for people on cycles, with pushchairs or using mobility aids to enjoy the benefits of active travel.
"Cycling and walking for local journeys is part of the solution to many of the challenges we face today, including road congestion, air pollution and high levels of inactivity."
The work at Kennington is planned to be completed by March 2020.
(CM/JG)
