Originally Posted by rhwbullhead

​​​​​​Unlike with Spirit flights, where airport price can end up being more than their version of the interface fee, with Frontier, the price at airport is the regular price, minus CIC. I have not had this not be the case and I've booked flights almost every week or every other week since Oct.

Flights that have two segments (e.g. Ord-DEN-LAS) will have an even larger CIC.

Sometimes, with very cheap flights, there is no carrier interface charge and it usually these flights which end up cheaper with discount den. I've booked almost all my flights at airport as about 90% of them were cheaper there vs Discount Den.