Exhibit 99

PRESS RELEASE:  Webcast Alert:  Ultra Petroleum Corp.  Announces Its 2nd Quarter
Earnings Conference Call Webcast

[ 2004-07-27 ]

     HOUSTON,  July 21  /PRNewswire-FirstCall/  -- In  conjunction  with  Ultra
     Petroleum Corp.'s (Amex: UPL) Second Quarter Earnings Conference Call, you
     are invited to listen to its webcast that will be broadcast  live over the
     Internet on Wednesday, July 28, 2004 at 10:00 AM Central.

     What:    Ultra  Petroleum  Corp.'s Second Quarter  Earnings  Conference
              Call Webcast

     When:    Wednesday, July 28, 2004 at 10:00 AM Central

     Where:   http://phx.corporate-ir.net/playerlink.zhtml?c=62256&s=wm&e=917899
              or at http://www.ultrapetroleum.com

     How:     Live over the  Internet  -- Simply log on to the web at either
              of the addresses above

     Contact: David Russell at 281-876-0120 x 302

     If you are unable to participate during the live webcast, the call will be
     archived at http://www.ultrapetroleum.com.  To access the replay, click on
     the  home  page.

     Ultra  Petroleum is an  independent,  exploration  and production  company
     focused on  developing  its long life  natural  gas  reserves in the Green
     River Basin of Wyoming,  and oil reserves in Bohai F Bay,  offshore China.
     Ultra is listed on the American Stock Exchange under the ticker "UPL" with
     74,955,768 shares outstanding at the time of this release.

           (Minimum  Requirements  to listen to  broadcast:  The Windows  Media
     Player          software,          downloadable          free         from
     http://www.microsoft.com/windows/windowsmedia/EN/default.asp  and at least
     a 28.8Kbps connection to the Internet.)

     SOURCE  Ultra Petroleum Corp.
           /CONTACT:  David Russell of Ultra Petroleum Corp., +1-281-876-0120
     ext. 302/
     /Photo: NewsCom: http://www.newscom.com/cgi-bin/prnh/20020226/DATU029LOGO
     AP Archive:  http://photoarchive.ap.org
     PRN Photo Desk, photodesk@prnewswire.com /
     /Web site: http://www.microsoft.com/windows/windowsmedia/EN/default.asp /
     /Web site: http://www.ultrapetroleum.com /
     /Audio:
     http://phx.corporate-ir.net/playerlink.zhtml?c=62256&s=wm&e=917899 /
     (UPL)

     Order free Annual Report for Ultra Petroleum Corp.
     Visit http://djnewswires.ar.wilink.com/?link=UPL or call 1-888-301-0513

     Dow Jones Newswires
     07-27-04 0935ET
     Copyright (C) 2004 Dow Jones & Company, Inc. All Rights Reserved.

     Subject Codes: I/OIS,  I/XDJGI,  N/DJIN,  N/DJN,  N/DJWB,  N/CNW,  N/DJWI,
     N/PRL, N/TPCT, M/ENE, M/NND, M/TPX, R/NME, R/TX, R/US, R/USS

     Company Codes: UPL

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