The clean-burning characteristics of hydrogen make it ideal alternative fuel for combustion applications. Pure hydrogen has many issues like storage, transportation, cost, and flashback while burning. Therefore, blending hydrogen with other hydrocarbon fuels could be the solution. The present study uses a chemiluminescence imaging technique to examine the effect of hydrogen blends with the premixed Liquefied Petroleum Gas (LPG)/air flames. A single swirl burner with a bluff body configuration is used for this study. The hydrogen is added by a mass fraction of 5% and 10% with LPG. Simultaneous OH* and CH* chemiluminescence measurements were carried out to identify the reaction zone in the premixed LPG/hydrogen/air flames. Also, natural luminescence and flame structrues are observed by direct imaging. It is observed that by adding hydrogen with LPG, the reaction zone moves downstream rather than attaching with burner exit. As hydrogen has a higher flame speed, it is expected that adding hydrogen would bring the flame front upstream, and further addition will lead to flashback. But in the present case, the addition of hydrogen with LPG leads to more distributed combustion than flamelet. This could help in delaying flashbacks comparing with other fuel blends like methane/hydrogen/air flames. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.