Since you're not asking about miles and points, this question may not be the best for the MilesBuzz forum (the latest frequent flyer program buzz...).

I'm going to move it to TravelBuzz.

In the meantime, you might try searching with http://www.opodo.com or http://matrix.itasoftware.com/cvg/dispatch/ or or http://www.applefares.com (though in the case of this last option - it's good for searching low fare carriers but offers only a few carriers...)

Cheers,
Gary
aka gleff
MilesBuzz and Delta moderator