Well, EasyJet just CLOSED the application for LGW.
You have to check the homepages of the airlines you are interested in. The information should be there.
Ryanair is hiring all the time in Europe and Qatar is hiring regularly for Doha base.
Put "cabin crew" and "flight attendant" and "air hostess" plus job/career in google and start your research! Start with
www.aviationjobsearch.com and keep reading.