I took the time to put it together
This if based on the following assumptions:
a. Offpeak travel
b. Flying out of North America
c. Fly coach class
UA AA CO DL NW Star Alliance
Alaska 25 25 25 25 25 30
Canada 25 25 25 25 25 30
Hawaii 35 35 35 35 35 40
Carribean 35 30 35 30 35 35
Mexico 35 30 35 30 35 35
India 80 75 90 80 90 100
If some one can automate it to go search & update it would be good since airlines change it all thee time