One of my favorite sites to use is Airfare Watchdog. With Airfare Watchdog you can compare the prices on the biggest airlines AND get notified by e-mail when your preferred route is at its lowest price!! I travel to Miami alot and this website sends me an e-mail when the flight from Newark, NJ to Fort Lauderdale at their cheapest!!
Check out Airfare Watchdog Today!
Another of my favorite website is booking.com..Booking.com has a special offer for summer 2016!!!!They are offering you to Save up to 50% off this Summer! No booking fees ever.
I have had such positive experiences with booking.com!! you will love it!