Wildfire Disaster Funding Act This bill amends the Balanced Budget and Emergency Deficit Control Act of 1985 to require specified adjustments to discretionary spending limits in FY2017-FY2026 to accommodate appropriations for wildfire suppression operations in the Wildland Fire Management accounts at the Department of Agriculture (USDA) or the Department of the Interior. If USDA or Interior determines that supplemental appropriations are necessary for wildfire suppression operations, the bill requires the relevant department to submit to Congress a request for the funding and a plan for obligating the funds. The bill also requires the President's budget to include the average costs for wildfire suppression over the previous 10 years.