Google Flights is one of the best flight-finding websites of all time. Here's why:
Google Flights is easy to use and has a great user interface. My main browser is Chrome, and if a type something in a New Tab such as "New York to LA", then up comes Google Flights with the best prices in front of me. You don't have to go find a website with the flight you want this way. Everything is right in front of you at the top of the page.
It's extremely customizable as well. You can choose bags, stops, airlines, prices, times, connecting airports, and more. You can also track prices, check legroom, plane type, and expected delays. It tells you about baggage fees, amenities, and fares overtime so you know when the best time to purchase your flight is.
Google Flights is one of the best services I've ever used and I'd recommend using it on your next flight for maximum comfort.