This app offers an easy convenience in finding flight deals offered by different airlines. It’s more conventionally designed in terms of look and feel than Skyscanner, and is quite straightforward to use. It also offers extras, like the option to search for flights within one or two days on either side of a target date, which will present more results. An interesting feature of KAYAK’s app is that they offer a price forecast service, which has price history charts showing recent trends as well as a handy alert when or whether your airfare is likely to increase. KAYAK has plenty of other features as well, like the ability to book hotels and rental cars alongside flights. Free on iOS and Android.