SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                (Amendment No. 3)

                   Under the Securities Exchange Act of 1934*

                         Flow International Corporation
     ---------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $0.01 per share
     ---------------------------------------------------------------------
                         (Title of Class of Securities)

                                    343468104
     ---------------------------------------------------------------------
                      (CUSIP Number of Class of Securities)

                                 Daniel S. Loeb
                                 Third Point LLC
                                 390 Park Avenue
                               New York, NY 10022
                                 (212) 224-7400
     ---------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                   Copies to:
                            Michael A. Schwartz, Esq.
                          Willkie Farr & Gallagher LLP
                               787 Seventh Avenue
                             New York, NY 10019-6099
                                 (212) 728-8000

                                  April 7, 2008
     ---------------------------------------------------------------------
                          (Date of Event which Requires
                            Filing of this Schedule)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box: [ ]

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 240.13d-7 for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).





                                  SCHEDULE 13D



---------------------------------                              -----------------
CUSIP No. 343468104                                            Page 2 of 9 Pages
---------------------------------                              -----------------


----------- --------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

            Third Point LLC
----------- --------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) [ ]
                                                                      (b) [X]

----------- --------------------------------------------------------------------
    3       SEC USE ONLY

----------- --------------------------------------------------------------------
    4       SOURCE OF FUNDS*

            AF
----------- --------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED
            PURSUANT TO ITEMS 2(d) or 2(e)                                [ ]

----------- --------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION

            Delaware
--------------------- --------- ------------------------------------------------
                         7      SOLE VOTING POWER

                                0
                      --------- ------------------------------------------------
NUMBER OF                8      SHARED VOTING POWER
SHARES
BENEFICIALLY                    4,710,000
OWNED BY              --------- ------------------------------------------------
EACH                     9      SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH                     0
                      --------- ------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                4,710,000
----------- --------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

            4,710,000
----------- --------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
            CERTAIN SHARES*                                               [ ]

----------- --------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            12.5%
----------- --------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*

            OO
----------- --------------------------------------------------------------------





                                  SCHEDULE 13D



---------------------------------                              -----------------
CUSIP No. 343468104                                            Page 3 of 9 Pages
---------------------------------                              -----------------


----------- --------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

            Daniel S. Loeb
----------- --------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) [ ]
                                                                      (b) [X]

----------- --------------------------------------------------------------------
    3       SEC USE ONLY

----------- --------------------------------------------------------------------
    4       SOURCE OF FUNDS*

            AF
----------- --------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED
            PURSUANT TO ITEMS 2(d) or 2(e)                                [ ]

----------- --------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION

            United States
--------------------- --------- ------------------------------------------------
                         7      SOLE VOTING POWER

                                0
                      --------- ------------------------------------------------
NUMBER OF                8      SHARED VOTING POWER
SHARES
BENEFICIALLY                    4,710,000
OWNED BY              --------- ------------------------------------------------
EACH                     9      SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH                     0
                      --------- ------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                4,710,000
----------- --------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

            4,710,000
----------- --------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
            CERTAIN SHARES*                                               [ ]

----------- --------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            12.5%
----------- --------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*

            IN
----------- --------------------------------------------------------------------





                                  SCHEDULE 13D



---------------------------------                              -----------------
CUSIP No. 343468104                                            Page 4 of 9 Pages
---------------------------------                              -----------------


----------- --------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

            Third Point Offshore Fund, Ltd.
----------- --------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) [ ]
                                                                      (b) [X]

----------- --------------------------------------------------------------------
    3       SEC USE ONLY

----------- --------------------------------------------------------------------
    4       SOURCE OF FUNDS*

            AF
----------- --------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED
            PURSUANT TO ITEMS 2(d) or 2(e)                                [ ]

----------- --------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION

            Cayman Islands
--------------------- --------- ------------------------------------------------
                         7      SOLE VOTING POWER

                                0
                      --------- ------------------------------------------------
NUMBER OF                8      SHARED VOTING POWER
SHARES
BENEFICIALLY                    3,047,200
OWNED BY              --------- ------------------------------------------------
EACH                     9      SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH                     0
                      --------- ------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                3,047,200
----------- --------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

            3,047,200
----------- --------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
            CERTAIN SHARES*                                               [ ]

----------- --------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            8.1%
----------- --------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*

            OO
----------- --------------------------------------------------------------------





     This Amendment No. 3 amends the Schedule 13D filed on February 2, 2007 (as
amended by Amendment No. 1 thereto filed on April 4, 2007, Amendment No. 2
thereto filed on April 23, 2007, and this Amendment No. 3, the "Schedule 13D")
and is being filed on behalf of Third Point LLC, a Delaware limited liability
company (the "Management Company"), Daniel S. Loeb, an individual, and Third
Point Offshore Fund, Ltd., a Cayman Islands limited liability exempted company
(the "Offshore Fund", and together with Mr. Loeb and the Management Company, the
"Reporting Persons"). This Amendment No. 3 relates to the Common Stock, par
value $0.01 per share, of Flow International Corporation, a Washington
corporation (the "Company"). The Management Company is the investment manager or
adviser to a variety of funds and managed accounts (such funds and accounts,
including the Offshore Fund, the "Funds"). The Funds directly own the Common
Stock to which the Schedule 13D relates, and Mr. Loeb and the Management Company
may be deemed to have beneficial ownership over such Common Stock by virtue of
the authority granted to them by the Funds to vote and to dispose of the
securities held by the Funds, including the Common Stock.

Item 3.   Source and Amount of Funds or Other Consideration.

     Item 3 of the Schedule 13D is hereby amended and restated as follows:

     The Funds have expended an aggregate of approximately $25,242,821 of their
own investment capital to acquire the 4,710,000 shares of Common Stock held by
them. The Offshore Fund has expended an aggregate of approximately $15,971,133
of its own investment capital to acquire its 3,047,200 shares of Common Stock.
The Funds effect purchases of securities primarily through margin accounts
maintained for them with Bear, Stearns Securities Corp., Goldman, Sachs & Co.,
Citigroup Global Markets, Inc. and UBS Securities LLC, which may extend margin
credit to the Funds as and when required to open or carry positions in the
margin accounts, subject to applicable Federal margin regulations, stock
exchange rules and the firms' credit policies. In such instances, the positions
held in the margin accounts are pledged as collateral security for the repayment
of debit balances in the accounts.

Item 5.   Interest in Securities of the Issuer.

     Item 5 of the Schedule 13D is hereby amended and restated as follows:

     (a) As of the date hereof, the Management Company and Mr. Loeb beneficially
own 4,710,000 shares of Common Stock (the "Shares"). The Shares represent 12.5%
of the 37,586,911 shares of Common Stock outstanding as of February 29, 2008, as
reported in the Company's Quarterly Report on Form 10-Q for the quarterly period
ended January 31, 2008. The percentages used herein and in the rest of this
statement are calculated based upon this number of outstanding shares. The
Offshore Fund directly beneficially owns 3,047,200 shares of Common Stock,
representing 8.1% of the outstanding shares of Common Stock as of the date
hereof.

     (b) The Management Company and Mr. Loeb share voting and dispositive power
over the 4,710,000 shares of Common Stock held directly by the Funds. The
Management Company, Mr. Loeb and the Offshore Fund share voting power and
dispositive power over the 3,047,200 shares of Common Stock held by the Offshore
Fund.


                                       5





     (c) Schedule A hereto sets forth certain information with respect to
transactions by the Funds (at the direction of the Management Company and Mr.
Loeb) in Common Stock during the past 60 days. Schedule B hereto sets forth
certain information with respect to transactions during the past 60 days by the
Offshore Fund (at the direction of the Management Company and Mr. Loeb) in
Common Stock. All of the transactions set forth on Schedule A and Schedule B
were effected in the NASDAQ Global Market. Except as set forth on Schedules A
and B, during the past 60 days there were no transactions in the Common Stock
effected by the Reporting Persons, nor, to the best of their knowledge, any of
their directors, executive officers, general partners or members.

     (d) Other than the Funds which directly hold the Shares, and except as set
forth in this Item 5, no person is known to have the right to receive or the
power to direct the receipt of dividends from, or the proceeds from the sale of,
the Shares.

     (e) Not applicable.

Item 7.   Material to Be Filed as Exhibits.

99.6   Power of Attorney granted by Daniel S. Loeb in favor of Zachary Snow,
       Keith Waller and Bruce Wilson, dated February 11, 2008.


                         [Signatures on following page]


                                       6





                                   SIGNATURES

     After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.

Dated:  April 9, 2008

                                   THIRD POINT LLC

                                   By:  Daniel S. Loeb, Chief Executive Officer


                                   By: /s/ Keith Waller
                                      ------------------------------------------
                                      Name:   Keith Waller
                                      Title:  Attorney-in-Fact



                                   THIRD POINT OFFSHORE FUND, LTD.

                                   By:  Daniel S. Loeb, Director


                                   By: /s/ Keith Waller
                                      ------------------------------------------
                                      Name:   Keith Waller
                                      Title:  Attorney-in-Fact



                                   DANIEL S. LOEB


                                   By: /s/ Keith Waller
                                      ------------------------------------------
                                      Name:   Keith Waller
                                      Title:  Attorney-in-Fact




               [SIGNATURE PAGE TO AMENDMENT NO. 3 TO SCHEDULE 13D
                 WITH RESPECT TO FLOW INTERNATIONAL CORPORATION]





                                   Schedule A
                                   ----------


                   (Transactions by the Funds in Common Stock
                            during the past 60 days)


     Date           Transaction          Shares           Price Per Share($)
     ----           -----------          ------           ------------------

--------------- ------------------- ----------------- --------------------------
    4/07/08             SELL            (350,000)                10.25
--------------- ------------------- ----------------- --------------------------





                                   Schedule B
                                   ----------


               (Transactions by the Offshore Fund in Common Stock
                            during the past 60 days)


     Date           Transaction          Shares           Price Per Share($)
     ----           -----------          ------           ------------------

--------------- ------------------- ----------------- --------------------------
    4/07/08             SELL            (350,000)                10.25
--------------- ------------------- ----------------- --------------------------