Google flights will show you a price grid, making it easier to lower your cost--with the proper "fine tuning", you can even limit it to particular airlines BUT, the nicest feature is once you have chosen flights, Google Flights will "seamlessly" go directly to the airlines sight and get the booking in place.
Once I was trying to book a itn directly on AA--certain flights did NOT show up; Google Flights found them and booked them directly on aa.com.