They often know the market well and can predict when
Finding a cheap flight is about being flexible and smart in where you go, when you go, and how you get there. Follow the tips above, but don’t waste forever finding a cheap flight. If you’re spending more than an hour booking a flight, you’re spending too much time. Spend 30-40 minutes finding and booking a cheap flight at a price you’re OK paying and move on with your life. I never second-guess myself on flights. You’ll go crazy if you do.
You're not crazy for thinking that a flight price has changed after searching it a few times in your web browser. Based on the cookies in your browser, flight prices do increase when a particular route is repeatedly searched, as the site wants to scare you into booking the flight quickly before prices get even higher. Always search for flights in incognito or private browsing mode to see the lowest prices.