Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

                Date of Report (Date of earliest event reported):
                                  July 2, 2004

                           KNIGHT TRANSPORTATION, INC.
             (Exact name of registrant as specified in its charter)

           Arizona                     000-24946                86-0649974
(State or other jurisdiction    (Commission File Number)    (I.R.S. Employer
       of incorporation)                                    Identification No.)

                  5601 W. Buckeye Road, Phoenix, Arizona 85043
               (Address of principal executive offices) (Zip Code)

               Registrant's telephone number, including area code:
                                 (602) 269-2000

                                 Not applicable
          (Former name or former address, if changed since last report)

Item 1.  Changes in Control of Registrant.

         Not applicable.

Item 2.  Acquisition or Disposition of Assets.

         Not applicable.

Item 3.  Bankruptcy or Receivership.

         Not applicable.

Item 4.  Changes in Registrant's Certifying Accountant.

         Not applicable.

Item 5.  Other Events and Regulation FD Disclosure.

         Not applicable.

Item 6.  Resignations of Registrant's Directors.

         Not applicable.

Item 7.  Financial Statements and Exhibits.

         (c) Exhibits.

         NUMBER             EXHIBIT TITLE
          99.1         Knight Transportation, Inc. press release announcing
                       3-for-2 stock split

Item 8.  Change in Fiscal Year.

         Not applicable.

Item 9.  Regulation FD Disclosure.

     On July 2, 2004, Knight  Transportation,  Inc., an Arizona corporation (the
"Company")  issued a press  release (the "Press  Release")  announcing  that its
Board of Directors has declared a 3-for-2  stock split.  The stock split will be
effected in the form of a stock dividend and entitle all  shareholders of record
as of the close of business on July 12, 2004 to receive one additional  share of
common  stock for  every two  shares of  common  stock  held on that  date.  The
additional shares will be distributed to shareholders on or about July 20, 2004.
Cash  will be paid in lieu of  issuing  fractional  shares.  A copy of the Press
Release is attached as Exhibit 99.1 hereto.

     The  information  in  this  report  and  the  exhibit  hereto  may  contain
"forward-looking   statements"   that  are  made  pursuant  to  the  safe-harbor
provisions of the Private Securities Litigation Reform Act of 1995 and otherwise
may be  protected.  Such  statements  are made based on the current  beliefs and
expectations  of the Company's  management and are subject to significant  risks
and uncertainties. Actual results or events may differ from those anticipated by
forward-looking statements.  Please refer to the Company's Annual Report on Form
10-K  and  other  filings  with  the  Securities  and  Exchange  Commission  for
information  concerning  risks,  uncertainties and other factors that may affect
future results.

Item 10. Amendments to the Registrant's Code of Ethics, or Waiver of a
         Provision of the Code of Ethics.

         Not applicable.

Item 11. Temporary Suspension of Trading Under Registrant's Employee
         Benefit Plans.

         Not applicable.

Item 12. Results of Operations and Financial Condition.

         Not applicable.


     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                    KNIGHT TRANSPORTATION, INC.

Date: July 6, 2004                     /s/ David A. Jackson
                                    David A. Jackson
                                    Chief Financial Officer

                                  EXHIBIT INDEX

99.1   Knight Transportation, Inc. press release announcing 3-for-2 stock split