This study evaluates the thermodynamic properties of alkane combustion using Density Functional Theory (DFT) across various rungs of Jacob's ladder with 2 different basis sets. A clear linear trend in enthalpy (ΔH) and Gibbs free energy (ΔG) as a function of chain length (C₁-C₁₀) was observed, consistent with the exothermic and spontaneous nature of combustion. The local density approximation and dispersioncorrected DFT functionals exhibited superior agreement with experimental data. In contrast, gradientbased functionals with split-valence basis set showed significant discrepancies, particularly for larger alkanes. They faced convergence challenges for n-hexane due to near-degenerate electronic states and SCF instabilities. The linear fit models for reaction parameters show excellent agreement with trend. The deviation analysis for enthalpy considering experimental data underscore the sensitivity to functional and basis set selection for computational approach. Overall, the findings of this study provide a benchmark for different DFT methods for alkane combustion.