Before I book any flight tickets, there are two websites I always check to find good deals. The main website I use is Google Flights and the reason I like Google Flights is because once I choose the dates I can see what dates I can change to save in both departure & return flights. For example I set the departure date on Oct 3rd, then I will see that the 2nd or 4th are much cheaper and it shows the exact price. I change the departure date, then I see the cost for each return date. I choose the lowest price one, because sometimes the saving is significant. Another reason why Google Flight is amazing, is because it will take you to airlines websites to book the ticket. The other websites will only show tickets that can be booked through their website. I once missed a very good deal, because I didn’t know that Saudia Airline doesn’t show their tickets on Expedia. There is another website I check just in case which is Skiplagged, which has similar function. I usually check both to be on the safe side.