The benefits of the accessibility approach in transport planning are well-known and widely documented in the literature. However, in practice, most transport planning processes are focused on improving mobility and not on improving accessibility. Recent research has made it clear that what is blocking the accessibility approach are not the technological dimensions of transport planning, or the lack of knowledge about how to perform accessibility planning in practice. This approach is being blocked instead by institutional barriers. This article critically identifies some of these barriers. Adopting a cross-disciplinary and international perspective, two rounds of in-depth interviews with accessibility experts were conducted. This allowed gathering insights not only about the institutional barriers to the adoption of the accessibility approach in transport planning practice, but also about possible pathways to make accessibility a more central concept in decision-making.