I always use Google Flights to track pricing because I’ve noticed on (at least) the Delta app that the more you search for a flight the more likely the price goes up. I might be paranoid, but I still suspect that the airlines boost the price the more you look at it. We’ve all gotten emails from American Airlines saying “ are you still looking at that trip to Miami?” or a note on the United app saying “hey, you should complete your purchase to IAD that you looked at three weeks ago”. So we know they track our searches.

Several times I have clicked through Google flights to the airline website and found a price and trip combo that I couldn’t get by searching the website by itself. So, if I’m going to track flight prices, I’m going to do it on Google Flights.