Travel Tools - Google Flights vs Actual Airline?

Google gives one dollar amount for flight, but when you go to actually make the reservation, the dollar amount is not the same, and at times, not even close. Is this normal?

Found a $90 one way, but when I went to purchase it, USAir site said it was now $130 something.

:confused:

maybe its not including taxes.... IMO

It happened a few times, but apparently nothing more since. Maybe I was on my laptop too long. :eek:

The data is probably cached, so not exactly the live GDS result.