prices from many different companies that offer the flight
Although online travel websites are a great way to find cheap travel rates, you will want to checkout the airlines themselves. All airlines have online websites. Many will regularly offer deals and discounts on many of their flights. These deals and discounts are likely to change often, so if you see something that catches your eye, you may want to snatch up the deal real quick before it is gone.
If you go lower than that, you might miss your preferred
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.