Read the fine print on the website, left side....
"Public Charter flights are operated by Sun Country Airlines. Advertised airfares are one-way and include Federal Excise Tax of 7.5%. Airfares do not include September 11th Security Fees of $2.50 per person up to a maximum of $5.00 per trip segment, Federal Flight Segment Taxes of $3.60 per person per flight segment, Passenger Facility Charges (PFC) of up to $4.50 per person per enplanement, and a Booking Fee of $10.00 per person, per reservation."
Gets me every time
FD