Technology these days has reached such a level that you can actually check for airline fares and book tickets from the very comfort of your phone. This was doable from websites as well, but seeing it integrated into an App, it kind of amazes even the best technological geek.
Official Description :
ITA Software’s OnTheFly™ offers an advanced way to shop for airfares for any itinerary in the world. Easily find the best fares and flights available for your trip.
* Intuitive travel date calendar
* Fine-grained control over all search parameters
* Full disclosure of exact airfare calculation
* Does not allow booking
You can download this App from the Android Market.