Utilizing lignin feedstock along with cellulosic ethanol for the production of high-energy-density jet fuel offers a significant opportunity to enhance the overall operation efficiency, carbon conversion efficiency, economic viability, and sustainability of biofuel and chemical production. A patented catalytic process to produce lignin-substructure-based hydrocarbons in the jet-fuel range from lignin was developed. Comprehensive techno-economic analysis of this process was conducted through process simulation in this study. The discounted cash flow rate of return (DCFROR) method was used to evaluate a 2000 dry metric ton/day lignocellulosic ethanol biorefinery with the co-production of lignin jet fuel. The minimum selling price of lignin jet fuel at a 10% discount rate was estimated to be in the range of $6.35-$1.76/gal depending on the lignin and conversion rate and capacity. With a production capacity of 1.5-16.6 million gallon jet fuel per year, capital costs ranged from $38.0 to $39.4 million. On the whole, the co-production of jet fuel from lignin improved the overall economic viability of an integrated biorefinery process for corn ethanol production by raising co-product revenue from jet fuels.