Exhibit 23.4 Consent of Independent Auditors We consent to the reference to our firm under the caption "Experts" and to the use of our report dated March 19, 1996, incorporated by reference in the Proxy Statement of Sierra On Line, Inc. that is made a part of the Registration Statement (Form S-4) and Prospectus of CUC International Inc. /s/Ernst & Young LLP ERNST & YOUNG LLP Stamford, Connecticut June 19, 1996