There arent any traditional outlet malls near DL. The closet one is called The Citadel and can be easily reached by taking the 5 fwy north. It should only take you 30 min w/no traffic. The only down side is that its quite small compared to other outlets. But they do have The Gap and OshKosh. Heres a link for a complete listing of stores
http://www.citadeloutlets.com/
Closer to DL (5-10 mins away) is the Block of Orange which is an outdoor/entertainment mall with a handful of outlet stores like Ann Taylor outlet and Off 5th (an outlet for the upscale Saks Fifth Ave department store).
http://www.theblockatorange.com/static/node848.jsp;jsessionid=aFtFP0jCz6FexYhQP6
If you are looking for the major outlet malls they are located in the out lying areas.
Camarillo Outlet (just north of LA)
http://premiumoutlets.com/outlets/outlet.asp?id=20
Desert Hills Outlet (near Palm Springs)
http://www.premiumoutlets.com/outlets/outlet.asp?id=6
Carlsbad Outlet (north of SD)
http://www.premiumoutlets.com/outlets/outlet.asp?id=66
These should take you about 1-2 hrs to get to from DL with Carlsbad being the closest.
I would also recommend South Coast Plaza
http://www.southcoastplaza.com/ which, IMO, is the best shopping mall in Southern California. Many people are scared off by all the luxury boutiques (Chanel, Louis Vuitton, Armani, Gucci etc), but they have many affordable stores that should not be missed and many have wonderful sales. I love Zara for very hip European clothes at very reasonable prices. The mall has a shuttle that service many of the hotels near
Disneyland (see website)
Also across the street from the mall is a place called Metro Pointe
http://www.metropointe.com/ which as a Nordstrom outlet with tons of designer stuff, especially shoes!!