(KAIT/NBC) - If it seems like plane ticket prices fluctuate by the minute--they can.
Airfarewatchdog.com's Amanda Norcross says more airlines utilize dynamic pricing, changing fares based on demand and customer data.
"It's absolutely legal for airlines to search your browser history search history and determine what they think you'll be willing to spend for a flight," Norcross says.
Avoid dynamic pricing by clearing cookies and search history.
You can also search for flights multiple times on different days and devices.
Try to book your flight in an "incognito" browser.
Get the lowest fare by traveling outside of the busiest travel times.
Click here for more air travel hacks.