According to our 2015 Weight Loss Surgery Cost Survey, the cost of bariatric surgery without insurance in the United States ranges from $6,000 to $30,000 for the four most common procedures: gastric sleeve surgery, gastric bypass surgery, gastric banding (lap band surgery), and the gastric balloon procedure. Gastric bypass surgery costs $24,000 on average in the United States (note that it was relatively common for gastric bypass and gastric sleeve to be quoted at the same cost, although more often than not, gastric sleeve was the lower cost procedure).