I don't travel much so I'm new at this. I'm planning going to California (from Ohio) over Christmas break; so far, I've used Expedia but the cheapest option is $588. Can someone point me to how I can find the cheapest flight? For example, other sites, or picking a departure/arrival date on weekdays (vs weekends), which airline company is cheaper, etc. I know booking a flight as early as possible is cheaper, but my plan is to leave sometimes after this Friday (or this Friday).