Google flight has a lot of filtering options so you can find the exact flight you want to buy. For example, maybe when you search for tickets, you have a specific value in your mind, or you may have to keep the flight period, time of arrival, or the specific award network in mind.

On the Google Flights website, after selecting the departure airport (and if you want a round trip flight, return the airport), when you want to sign out and choose another for the return flight.