United States securities and exchange commission logo July 31, 2020 Adam W. Miller Chief Financial Officer Knight-Swift Transportation Holdings Inc. 20002 North 19th Avenue Phoenix, Arizona 85027 Re: Knight-Swift Transportation Holdings Inc. Form 10-K for Fiscal Year Ended December 31, 2019 File No. 001-35007 Dear Mr. Miller: We have completed our review of your filings. We remind you that the company and its management are responsible for the accuracy and adequacy of their disclosures, notwithstanding any review, comments, action or absence of action by the staff. Sincerely, Division of Corporation Finance Office of Energy & Transportation