Guinea fowl can fly but they prefer to run. Guinea fowl will fly if they are frightened or spooked.
If you keep guinea fowl and let them permanently free range all day and night then they will fly up into the nearest set of trees or into the roof of a barn to roost for the night when it starts to get dark.
If you keep guinea fowl and want to ask a question to get some advice or just to chat about your guinea fowl then why not join the free farmingfriends guinea fowl forum.
If you fancy having ago at incubating, hatching and raising guinea fowl keets then check out my Incubating, Hatching & Raising guinea Fowl Keets eBook and if you are in the UK then I also have guinea fowl eggs for hatching for sale.