Exhibit 99.1

                                    For Immediate Release
                                    Phoenix, Arizona - October 20, 2004
                                    Contacts:    Kevin P. Knight, Chairman & CEO
                                                 Dave Jackson, CFO
                                                 (602) 269-2000

                         Knight Transportation Announces
                         Third Quarter Financial Results

Knight  Transportation,  Inc.  (NASDAQ NM: KNGT)  announced  today its financial
results for the quarter and nine months ended September 30, 2004.

For the quarter ended  September 30, 2004,  total revenue  increased  30.1%,  to
$114.1 million from $87.6 million for the same quarter of 2003. Revenue,  before
fuel  surcharge,  increased  25.7%, to $106.1 million from $84.4 million for the
same quarter of 2003.  Net income  increased  32.6%,  to $12.6 million from $9.5
million for the same quarter of 2003. Net income per diluted share  increased to
$0.22 from $0.16 for the same quarter in 2003.

For the nine months ended September 30, 2004, total revenue  increased 26.2%, to
$315.5 million from $250.0 million for the same period of 2003. Revenue,  before
fuel surcharge,  increased  23.6%, to $296.5 million from $239.8 million for the
same period of 2003.  Net income  increased  30.6% to $33.3  million  from $25.5
million for the same period of 2003.  Net income per diluted share  increased to
$0.58 from $0.44 for the same period of 2003.

Chairman and Chief Executive  Officer Kevin P. Knight  commented on the quarter:
"Our associates  registered another quarter of record revenue and earnings as we
continued  to  execute  our  operating  model  focused  on  leading  growth  and
profitability. We were especially pleased with revenue growth of over 25% before
fuel  surcharge  and over 30%  including  fuel  surcharge in a difficult  growth
environment for our industry. In addition, even with industry-leading growth and
significant fuel,  driver pay, and other cost pressures facing our industry,  we
improved our margins.  Our  operating  ratio  (operating  expenses,  net of fuel
surcharge, as a percentage of revenue, before fuel surcharge) improved by nearly
a full point to 80.4%, the lowest since the 4th quarter 1994, and our net income
was 11.8% of revenue, before fuel surcharge, which is the best in our history as
a public  company.  We achieved these results through a combination of expanding
our fleet, significant rate increases, greater productivity from our trucks, and
a never-ending mission of cost-control.

Our growth came from expansion of our fleet and higher revenue per tractor.  Our
average tractors  operating in the third quarter were up 15% year over year, our
average freight revenue per loaded and total mile,  before  surcharges,  were up
8.3% and 7.5%, respectively.  Our average miles per tractor were up 1.6% and our
average length of haul was up 5.0%.

During the quarter, we continued our long-running strategy of growth through new
operations centers and continued  expansion at existing  operations  centers. In
July,  we  opened  our 17th  operations  center  in  Lakeland,  Florida.  We are
especially  pleased with the efforts of our Florida team,  who, in spite of many
challenges as a result of the hurricanes, managed another successful startup for
our company.

We also were  successful in our opening of Knight  Refrigerated,  a wholly owned
subsidiary.  Our associates at Knight  Refrigerated  are working hard to develop
our refrigerated  operating model, in preparation for rolling out these services
in other  parts of the  country.  Our  services  have been well  received in the
temperature-control  marketplace,  leading to Knight-like  financial performance
for this subsidiary.

Rapidly escalating fuel prices are a significant challenge for our industry, and
our sales and operations associates are working diligently with our customers to
mitigate the negative impact of fuel prices. For the quarter,  we increased fuel
surcharge  billings by 149%  compared  with the same  quarter  last year.  These
efforts helped us limit the negative impact of fuel prices to approximately $.01
per share compared with the third quarter of last year.

During the quarter we continued to make significant investments in equipment and
facilities  to  support  our  growth.  We added 159 new  tractors,  upgraded  an
additional 71 tractors,  and capitalized 119 tractors from early buy out options
exercised  on  operating  leases.  We also added 551  trailers  and  upgraded an
additional  82  trailers,  and we  continued  to upgrade our  terminal  network.
Through  nine  months  we  have  invested  nearly  $93  million  in net  capital
expenditures,  which is most of our expected  budget for the year.  For 2004, we
expect cash flow from  operations to nearly cover our net capital  expenditures.
At September 30, our strong  balance sheet  reflected $24 million in cash,  zero
debt, and $275 million in stockholder's equity.

Looking forward, we expect the shipping environment to remain favorable based on
economic  growth of  approximately  three  percent or better in the remainder of
2004 and into 2005.  We also expect  industry-wide  trucking  capacity to remain
constrained  for the  foreseeable  future,  mainly due to the limited  number of
qualified drivers. Against that background,  we expect freight rates to increase
at least as much as operating costs and that our driver  compensation will allow
us to continue to attract and retain the quality  drivers we need to support our
efforts. Based on these assumptions, we remain on track to grow our tractor base
in  2004  by 350 to 400  units  and  anticipate  growing  our  tractor  base  by
approximately 400 units next year. We also expect to open 3 or 4 more operations
centers in 2005.

This month we were recognized by Forbes for the 10th consecutive  year,  placing
#66 on the annual  list of 200 Best Small  Companies.  Only 1 other  company has
been on the list for the past ten years. We would like to recognize  everyone in
our  organization for their hard work and dedication to the operating model that
makes our  business  what it is  today.  We plan to  continue  our  strategy  of
profitable growth with the goal of creating  additional value for our customers,
associates, and stockholders."

The  Company  will hold a  conference  call on October  21, 4:00 EST, to further
discuss its results of operations for the quarter ended  September 30, 2004. The
dial in number for this conference call is (800) 811-0667






                                                                                        
INCOME STATEMENT DATA:                      Three Months Ended September 30,          Nine Months Ended September 30,
                                                        (Unaudited, in thousands, except per share amounts)

                                                2004                2003                 2004                2003
                                                ----                ----                 ----                ----
REVENUE:
  Revenue, before fuel surcharge          $     106,109        $     84,445       $     296,521       $     239,786
  Fuel surcharge                                  7,947               3,194              18,996              10,171
                                          ------------------  ------------------  ------------------  ---------------------
TOTAL REVENUE                             $     114,056        $     87,639       $     315,517       $     249,957
                                          ------------------  ------------------  ------------------  ---------------------

OPERATING  EXPENSES:
    Salaries, Wages & Benefits                   34,441              26,908              96,904              77,097
    Fuel expense - gross                         21,879              14,277              59,011              42,142
    Operations & Maintenance                      7,234               5,444              19,022              15,165
    Insurance & Claims                            5,376               4,136              15,978              12,237
    Operating Taxes & Licenses                    2,476               2,342               7,066               6,758
    Communications                                  912                 769               2,653               2,236
    Depreciation & Amortization                  10,463               7,744              28,935              21,796
    Lease Expense - Revenue Equipment               634               1,920               2,903               5,843
    Purchased Transportation                      7,560               6,465              21,697              18,519
    Miscellaneous Operating Expenses              2,305               1,816               6,253               5,535
                                          ------------------  ------------------  ------------------  ---------------------
                                                 93,280              71,821             260,422             207,328
                                          ------------------  ------------------  ------------------  ---------------------
    Income From Operations                       20,776              15,818              55,095              42,629
                                          ------------------  ------------------  ------------------  ---------------------

OTHER  INCOME  (EXPENSE):
    Interest Income                                 132                 110                 339                 419
    Other Expense                                     -                   -                   -                   -
    Interest Expense                                  -                (165)                  -                (548)
                                          ------------------  ------------------  ------------------  ---------------------
                                                    132                 (55)                339                (129)
                                          ------------------  ------------------  ------------------  ---------------------
    Income Before Income Taxes                   20,908              15,763              55,434              42,500
INCOME  TAXES                                     8,350               6,300              22,150              17,010
                                          ------------------  ------------------  ------------------  ---------------------

NET  INCOME                               $      12,558       $       9,463       $      33,284       $      25,490
                                          ==================  ==================  ==================  =====================
Earnings Per Share:
                       - Basic            $        0.22       $        0.17       $        0.59       $        0.46
                       - Diluted          $        0.22       $        0.16       $        0.58       $        0.44
Weighted Average Shares Outstanding:
                       - Basic                   56,402              56,082              56,332              55,958
                       - Diluted                 57,747              57,503              57,534              57,345






                                                                                          
BALANCE SHEET DATA:
                                                                 9/30/2004                           12/31/2003
                                                               ------------                         ------------
                ASSETS                                                     (Unaudited, in thousands)
Cash and cash equivalents                                    $          24,382                   $          40,550
Accounts receivable, net                                                52,802                              38,751
Notes receivable, net                                                      226                                 515
Inventories and supplies                                                 1,957                               1,336
Prepaid expenses                                                         2,325                               7,490
Income tax receivable                                                     -                                  1,761
Deferred tax asset                                                       6,863                               5,667
                                                            ------------------------            ------------------------
     Total Current Assets                                               88,555                              96,070
                                                            ------------------------            ------------------------

Property and equipment, net                                            283,542                             212,935
Notes receivable, long-term                                                 80                                 362
Goodwill                                                                 7,504                               7,504
Other assets                                                             5,285                               4,355
                                                            ------------------------            ------------------------

     Total Assets                                            $         384,966                   $         321,226
                                                            ========================            ========================


Accounts payable                                             $          13,658                   $           3,408
Accrued payroll                                                          4,467                               3,448
Accrued liabilities                                                      7,043                               4,493
Claims accrual                                                          20,329                              14,805
                                                            ------------------------            ------------------------
     Total Current Liabilities                                          45,497                              26,154

Deferred income taxes                                                   64,425                              55,149
                                                            ------------------------            ------------------------

     Total Liabilities                                                 109,922                              81,303
                                                            ------------------------            ------------------------

Common Stock                                                               565                                 563
Additional paid-in capital                                              79,589                              77,754
Retained earnings                                                      194,890                             161,606
                                                            ------------------------            ------------------------
     Total Shareholders' Equity                                        275,044                             239,923
                                                            ------------------------            ------------------------


     Total Liabilities and Shareholders' Equity              $         384,966                   $         321,226
                                                            =========================           ========================






                                                                                                   
                                         Three Months Ended September 30,              Nine Months Ended September 30,

                                               2004            2003                          2004             2003
                                               ----            ----                          ----             ----
                                           (Unaudited)      (Unaudited)                  (Unaudited)      (Unaudited)

OPERATING  STATISTICS                                                      %                                               %
                                                                         Change                                         Change
Average Revenue Per Loaded Mile*               $1.556           $1.437    8.3%               $1.521          $1.433      6.1%

Average Revenue Per Total Mile*                $1.378           $1.282    7.5%               $1.349          $1.277      5.6%

Empty Mile Factor                               11.4%            10.8%    5.6%                11.4%           10.9%      4.6%

Average Miles Per Tractor                      28,834           28,379    1.6%               86,116          84,044      2.5%

Average Length of Haul                            564              537    5.0%                  549             529      3.8%

Operating Ratio**                               80.4%            81.3%                        81.4%           82.2%

Average Tractors - Total                        2,646            2,305                        2,535           2,226

Tractors - End of Quarter:
    Company                                     2,497            2,101                        2,497           2,101
    Owner - Operator                              256              229                          256             229
                                           -----------      ----------                   ----------      ----------
                                                2,753            2,330                        2,753           2,330

Trailers - End of Quarter                       7,142            6,165                        7,142           6,165

Net Capital Expenditures (in thousands)       $41,410          $15,139                      $92,650         $53,064

Cash Flow From Operations (in thousands)      $28,670          $22,924                      $74,720         $60,076


*    Excludes fuel surcharge.

**   Operating  ratio as  reported  in this  press  release  is based upon total
     operating  expenses,  net of fuel  surcharge,  as a percentage  of revenue,
     before fuel  surcharge.  Revenue  from fuel  surcharge  is available on the
     accompanying  statements  of income.  We measure our  revenue,  before fuel
     surcharge,  and our operating expenses,  net of fuel surcharge,  because we
     believe that eliminating this sometimes  volatile source of revenue affords
     a more consistent basis for comparing our results of operations from period
     to period.

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; Las Vegas,  NV;  Denver,  CO; Kansas City, KS;  Indianapolis,  IN; Katy, TX;
Gulfport,  MS;  Charlotte,  NC;  Memphis,  TN,  Atlanta,  GA;  Carlisle,  PA and
Lakeland,  FL. The Company  transports general  commodities,  including consumer
goods, packaged foodstuffs,  paper products,  beverage containers,  imported and
exported commodities and refrigerated goods.

This  press  release  may  contain   statements  that  might  be  considered  as
forward-looking statements or predictions of future operations.  Such statements
are based on  management's  belief or  interpretation  of information  currently
available.   These   statements  and  assumptions   involve  certain  risks  and
uncertainties.  Actual  events may differ from these  expectations  as specified
from time to time in filings with the Securities and Exchange Commission.

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