[macbr]

Google, including Google Flights, does have a cookie banner. It's just likely that you already accepted/denied the prompt at some point.

[forgotmypw17]

That’s certainly possible. I don’t deny occasionally clicking them. I just don’t bother most of the time.

Edit: I just tried the flight ordering flow again (starting at google.com/flights) in a private/incognito tab, and did not encounter any cookie banners.