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The main goal of this study is to investigate the strength and compaction characteristics of soil stabilized by fly ash with multiwalled carbon nanotube (MWCNT) as an additive. The materials used in the study were characterized using microscopic techniques like scanning electron microscopy-energy dispersive spectroscopy (SEM–EDS), and X-ray diffraction (XRD). The soil in the current study was replaced up to 50% by fly ash in the presence of MWCNT and sodium hexametaphosphate (SHMP) in different concentrations. The findings demonstrate that the Atterberg limits and specific gravity decrease with the increase in fly ash, MWCNT, and, SHMP. The maximum (46%) and minimum (24.2%) values of the liquid limit were recorded at 0% and 50% fly ash content, respectively. The maximum (34%) and minimum (20.2%) values of the plastic limit were observed at 0% and 50% fly ash content respectively. The specific gravity of natural soil decreases from the maximum value of 2.68 to the minimum value of 2.53 at 0% and 50% fly ash content, respectively. The optimum moisture content also decreases with the increase in fly ash, MWCNT, SHMP, and vice versa for maximum dry density. 0.01% w/w MWCNT + 80% Soil + 20% Fly Ash + 2% SHMP is the optimal mix. It gives maximum unconfined compressive strength (UCS) value in all the durations of curing, i.e. 0.50, 0.725, and 0.984 MPa at 1, 7, and 28 days of curing, respectively. The UCS value of this combination is 147% more than the UCS value of normal soil cured for 28 days. An economic analysis is also conducted to understand the feasibility of the application of MWCNTs in soil-fly ash mix. [ABSTRACT FROM AUTHOR]