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. * Multi-city itinerary search
* Intuitive travel date calendar
* Fine-grained control over all search parameters
* Full disclosure of exact airfare calculation
* Does not allow booking
** IMPORTANT **
All versions of OnTheFly prior to 18.104.22.168 will no longer work after December 5th, 2013. This is required because of a server change. If you have not already done so, please upgrade to the latest version now to avoid any interruption.