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6 of 18 Credit: Kayak.com

Kayak
For: iOS, Android, OS
FREE

You can't pass this app by; Kayak lets you search and book flights, hotels and car rentals while on the go without having to log onto a PC. The Buzz feature not only shows you the latest deals on flights, but also lets you book them. It removes the need to have to keep your paper-based itinerary, as Kayak keeps a record of your flight information and informs you of any delays. However, Kayak is very US-centric; other than being able to change the pricing to Australian currency, everything else is pulled from the US server (such as airline phone numbers).