How does Google make money from Google Flights?

 Google makes money from Google Flights through advertising and referral fees. Google displays ads alongside the flight search results and earns a fee when a user clicks on an ad and makes a purchase through the advertiser's website. Google also earns referral fees from online travel agencies and airlines when a user clicks on a flight price and makes a booking through the agency or airline's website. This referral fee is a commission on the booking value, which is a revenue source for Google.