I was recently browsing the internet for booking my air tickets from Philadelphia to Chicago. That was when I came across airfarestore.com. They offer the cheapest airfare rates compared to all others. They have a very simple search mechanism which gives instant access to their wide database consisting of about 60 major airlines. Cheap flights usually get booked fast and so it is better to book in advance to avoid last minute disappointments. Further they do not ask for too many details for searching the database which makes it very easy to use. They also offer great deals on international flights.