We did a retrospective cohort study with 2,543 cancer patients at Montefiore. We found that patients treated as purely outpatient experienced statistically significant greater delay for colorectal cancer and lung cancer, with a >2 fold risk of starting treatment beyond 45 days from diagnosis. Having more comorbidities was also associated with a 2-fold increase in delay for head and neck cancer and lung cancer. For breast cancer, uninsured and Spanish-speaking patients experienced increased delay. Our study supports evidence that treatment initiation delays are associated with demographic and socioeconomic disparities and that these delays likely contribute to worse cancer outcomes for these patients. Through our work, we have identified possible areas of intervention that could help address these delays in care, and potentially close the disparity gap.