Tip number 1: Follow low-cost airlines on social media or subscribe to their newsletter to get fresh news. Flight deals are not always top secret. Airlines may announce the sale on their website or social media but you can easily miss the information if you don't follow them. Which arilines should you follow? We suggest your local airlines as well as other carriers ranked as cheap airlines like Easy Jet, Kenya Airways, Ryanair, Fly540, Jambojet.com or Hahn Air Systems.