IT 4367 - DELHI to AGRA - 11:40 to 12:40
IT 4368 - AGRA to DELHI - 13:10 14:10
I rang their call centre, they confirmed that these flights are now available for booking starting November 1. The flights are not available for dates prior to that, according to the call centre agent.
There is no direct flight connecting Agra and Jaipur; you have to fly via Delhi.