Exhibit 99.1

                              KNIGHT TRANSPORTATION
                          ANNOUNCES 3-FOR-2 STOCK SPLIT


PHOENIX,  ARIZONA - July 2, 2004 - Knight  Transportation,  Inc. (Nasdaq:  KNGT)
announced  today that its Board of Directors  has declared a 3-for-2 stock split
on all shares of its outstanding  common stock that will be effected in the form
of a stock dividend.  The stock split will 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.  Knight  Transportation
currently has approximately 37.6 million shares of common stock outstanding, and
after giving  effect to the stock split,  will have  approximately  56.4 million
shares outstanding.

Knight  Transportation,  Inc.  is a short  to  medium  haul,  truckload  carrier
headquartered in Phoenix,  Arizona. The Company serves most of the United States
through its regional  operations in Phoenix,  AZ; Salt Lake City, UT;  Portland,
OR; Indianapolis, IN; Katy, TX; Gulfport, MS; Charlotte, NC; Memphis, TN; Kansas
City, KS; Atlanta, GA; Denver, CO; Las Vegas, NV; and Carlisle,  PA. The Company
transports general commodities,  including consumer goods,  packaged foodstuffs,
paper products, beverage containers, and imported and exported commodities.

This press release may contain  forward-looking  statements  that involve risks,
assumptions,  and uncertainties that are difficult to predict.  For a discussion
of such risks, assumptions, and uncertainties,  which could cause actual results
to differ from those expressed in  forward-looking  statements,  please refer to
our filings with the Securities and Exchange Commission.

Contact:  Kevin P. Knight, Chairman & CEO, at (602) 269-2000.