Hi, I'm planning a month trip to Morocco next summer (August/September) and might have the time to add a few extra weeks and hopefully see Egypt. I'm travelling from London to/from Marrakesh and was wondering what the cheapest way to get to Egypt from Morocco would be. Thanks
As far as I know, there are no cheap direct flights between Morocco and Egypt. Try to fly with atlas-blue to a European destination and from there with a European low cost carreer to Egypt.

OP - just in case you were thinking of overlanding, that is next to impossible too - Algerian borders are closed, and Libyan visas are very difficult to get unless you travel with a group. In any case this would of course take weeks in itself.
As #1 says, your best bet is definitely to use budget airlines (Easyjet, Atlasblue and I think Ryanair - look at Skyscanner to check other budget airline options) to fly back to Europe, then pick up a charter flight to Sharm el Sheikh, Luxor, Hurghada, or Marsa Alam.
Overland: the closed moroccan/algerian border isn't really an obstacle, as it is possible to go by ferry from Nador (Morocco) to Almeria (Spain) and from there with another ferry to Ghazaouet (Algeria). But andrewcuff asked for the c h e a p e s t way. I suppose that visa, transport and hotels on this long trip will cost more than 2 low cost flights.

Egypt Air on www.egyptair.com was cheap for us to go from Casablanca to Cairo. Royal Air Maroc (www.royalairmaroc.com) was a little more expensive, but both were reasonable. That was about 4 months ago. I would check their websites.