1 The average cost for treating lung cancer is around $7,000 to $40,000 per year. 2  The costs highly depend on if no active treatments are needed or if chemo is required. 3  It will also vary by the stage and histologic type. It will also vary by the stage and histologic type. 2  On average, the costs of lung cancer treatment hover around $1,500 to $3,200 per month without insurance. 3  Patients who survive through the first year incur the costs of initial treatment of around $26,000 for the first three months or $35,000 for the whole year.