Concepts and technologies disclosed herein are directed to per-session invocation of priority services based upon network available information. A service architecture can include a service architecture core and a service execution runtime framework in which a priority service application is executable to perform operations to provide a priority service for a communications session. The priority service application can determine whether a priority service should be invoked for the communications session based upon priority criteria. If a determination is made that the priority service is to be invoked for the communications session based upon the priority criteria, the priority service application can invoke the priority service for the communications session. If a determination is made that the priority service is not to be invoked for the communications session based upon the priority criteria, the priority service application can cause the communications session to be coordinated without the priority service.