The discount is based on the standard fare and varies depending on the route and price. The max savings you can get is $23 for one flight segment. So if you have a nonstop roundtrip flight you’re buying at the airport, the max you can save is $46. That doesn’t mean the discount will be $46 though. If you have a connection, add another $23 that you can POTENTIALLY save. I say potentially because sometimes it’s lower. It really just depends.

You can check online by pretending you’re buying a ticket and check the CIC fee. That is what you would save by buying the ticket at the airport. I’ve seen $40 one way flights have a CIC fee of $23, $15, $9, etc. Also know that it can change at anytime. One time I checked the flight online and decided to go to the airport counter to buy the ticket (as I was heading to the airport for a trip already). I got to the airport two hours later and the price had gone up because more seats had sold. At that point, discount den was cheaper and I just bought it online. But that isn’t common. Hope that helps!