Conventional travel time reliability assessment focuses either on reliability on route level or the determination of the valuation of reliability in route choice. However, a connection between origin and destination usually consists of multiple routes, thereby providing the option to choose. This study assesses the reliability and quality of the aggregate of the route set of an OD-pair as having (an) alternative(s) can compensate for deterioration of a single route. Furthermore, it is unknown how the perception of reliability of the aggregate of available routes depends on the travel behavior of the user. An adapted Logsum is proposed as aggregation method and the perceived reliability is investigated for multiple scenarios. It is determined that the Logsum is an appropriate measure for aggregation, but should be used combined with the ratio between number of alternatives and dispersion. The perceived reliability analysis showed that informing travelers and variable departure times can significantly improve the user perceived travel time reliability.