I use cheaptickets.com most of the time. Shit nowadays the direct site has better deals than those places. I got a ticket off Frontier for $33 on a Friday flight. I got a pretty good deal on Delta's direct site too. Anyone have a main one that hooks them up all the time??? Share the knowledge.

http://www.airfarewatchdog.com/
https://skiplagged.com/
https://twitter.com/TheFlightDeal

But I mostly now just work on my points at United and bang with their weekly specials.

like if you have money just sitting around to go anywhere on a whim, it's great
matching two exact cities for a flight in 2-3 months, you might get stuck with Frontier/Spirit which are both absolute refusals for me

Multiple other aggregate sites.
That auto open of all those new browsers messes up my search flow.