Exhibit 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Prospectus constituting part of the Registration Statement on Form S-3 (No. 33-57100) and in the Registration Statements on Form S-8 (No. 33-40397 and No. 33-44776) of Flow International Corporation of our report dated June 11, 1999 appearing on page 4 of this Form 11-K. PricewaterhouseCoopers LLP Seattle, Washington June 11, 1999