What site to use for air fare cost information
 

I used to have a site I would use for air fare cost and flight info. I would just type in departure airport and arrival airport and it would list all airlines and their cost and times. I have lost this information and would love to have it back. Does anyone know what I'm talking about? Thanks in advance.

www.itasoftware.com

You can't book through ITA (yet) and it doesn't show some discount airlines, especially Southwest. But it's pretty comprehensive.

www.mobissimo.com

it lists more than just airline fares, it lists the fares from some discounters as well. No Southwest fares however.

try sidestep too. You download it and then go shopping :)

I always start with Orbitz and then check Sidestep. Rarely much difference in those two but sometimes a $100+ savings will pop up!

Thanks everyone! You reminded me that it was Sidestep that I used, but I will try them all.