What is the basic item to compare when comparing airlines? The first aspect to compare is flight prices. I recommend staring at RezHub.com to look for your next cheap flight. Most online travel agencies will list similar prices and routes, so choose a site that you are comfortable with or that gives you a reason to book. RezHub offers to donate a portion of their proceeds to an environmetally friendly charity for booking with them.
You won’t, however, be able to find all the airlines here, such as Southwest Airlines and that is because Southwest has chosen to distribute only through its own website to reduce costs of distribution.