Have you found www.rome2rio.com yet? All you have to do is enter two different cities and it comes back with all the transportation possibilities - air/bus/drive. Even bike/walk if the distances are shorter. Besides cities, you can use more general points like even countries or more specific ones like actual addresses.

Considering the immense volume of detail it has to wade through, the information is surprisingly good. I've seen trivial instances where there are some local options and routes it missed, but it is my starter for sorting out how I'm planning to move my body about.

Excellent find on the better airfare!