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This study examines the vulnerable areas of public transit services focusing on the mobility to major employment centers in Seoul, Korea. To account for real traffic conditions of peak hours and congestion, we used the route guide information provided by Google Map Direction API and SK Planet T-map API. We have identified the vulnerable areas of public transit services in terms of transportation mobility, travel demand, and household income level. We used demographic and socioeconomic information to identify vulnerable areas for public transit services where average income level is low and the travel demand to major employment centers are high. The contribution of this research is as follows. First, we provided new methods to identify vulnerable areas of public transit services based on real-world traffic conditions using a route guide information system such as Google Map Direction API and SK T-map API. Second, we have specifically identified both the most vulnerable areas and potentially vulnerable areas of public transit services based on residents’ income and transportation mobility. Third, this study discussed the efficiency and equity of public transit services in the context of transportation planning. This study should contribute to transportation planning to achieve the higher mobility of low-income communities to major employment centers in Seoul, Korea.