This thesis explores the factors influencing the spot and contract price indices in the Swedish Road Freight Transport (RFT) sector, focusing on major haulier operational costs, RFT demand, and RFT supply-side proxies. Using monthly data from January 2019 to December 2024, first-differenced log-log OLS time series regression models are estimated, with Newey-West heteroskedasticity and autocorrelation consistent standard errors. The results indicate that spot prices respond significantly to changes in diesel prices, vehicle costs, administrative and other costs, and industrial production, suggesting an immediate pass-through of cost changes and demand shifts to spot market pricing. Contract prices, in contrast, show no significant relationship with any of the factors. The low explanatory power of the contract price model implies that contract pricing is influenced by unobserved factors such as negotiation dynamics, contractual terms, and market structure. These findings highlight the greater short-run sensitivity of spot prices to cost and demand shocks, while contract prices remain more stable but are mainly driven by strategic considerations. This distinction has practical implications for transport buyers, suggesting that spot markets offer cost responsiveness, whereas contract markets require robust negotiation strategies to ensure long-term efficiency. The study contributes to the limited empirical research on Swedish RFT sector pricing dynamics, applying rigorous econometric methods to examine the factors influencing spot and contract rates.