Cost of attic fan electrical hookup?

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If physically installing the wiring is already covered, the actual connection to the panel should take less time than typing the question. Expect an electrician to charge whatever they charge as the minimum for showing up. I wouldn't be surprised if the inspection costs more than the electrician charges.

It really depends on how far the wiring has to be run to get from a legal circuit or the electrical panel. So having said that I would guess if the supply run is not to difficult then $300 to $500

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It will cost you a couple of hundred bucks.  You must consider something. If you are venting your garage into your attic space then you are asking to get your house condemned. Doing so is very illegal.  Why you ask.  Well, let me explain how it works.

Your HVAC system has a part called the 'air handler'. It creates a vacuum as it pulls air out of your house though the heating coils, and/or evaporator and then forces the air back into your house though the vents in the ceiling, or high on the walls.  Sometimes the vacuum side develops a 'leak'.  In fact it happens a lot if your house is old. When a leak occurs hot hair from your attic gets drawn inside your house.  The amount is typically small.  

When you pull your car into the garage, the exhaust fumes will be drawn into the newly installed fan and into the attic, They will enter the HVAC system due to the leak. Your inside air will be contaminated with carbon monoxide, and being that most people keep their homes closed up, it may take days for the poisonous gas to egress, so it will build up with each time you pull your car in or out of the garage. You will not know it until your bird drops dead, visiting grandma gets sick, or your dog pukes.

Furthermore most cars use petrol for fuel.  If the vapors get sucked into your house for the same reason, and you turn on your stove, you will not be happy.

Finally if you have a fire in your garage, the flames, and hot embers will be sucked up into your attic.  Attics are made of very, very dry wood, and most are covered with tar shingles that are flammable although hard to get started because they contains sand and fiberglass to help prevent them from catching fire.

If the garage is a separate building, or if the fan exhausts outside, rather than into the attic space, then you can forget everything I said.

Good luck

125 to show up, one hour labor plus materials.  electrical code requires that wiring which will be exposed, as I assume this will, MUST be installed in conduit.  pvc conduit is ok.  it runs about 25 cents a foot at the usual store, plus the connectors at corners and the ends, which are maybe $3 each.  your wire is relatively cheap -- $2 a foot or so.  NOTE:  if the electrical in the garage is NOT up to code, the electrician will NOT do the job unless making it so is included in the scope of work ... and that may cost a fair bit more [100's, easily] if he has to do something like install a subpanel or replace the main feed to the garage from the breaker box.  suggest you get a bid -- the size of which will tell you if it is worth the hassle to get two more  -- grampa

........$119.43, give or take 3 cents.

$70 to $100 an hour.  An hour charge for the estimate call.  Much more if you are in California, New York, CT and MA.

Depends exactly what must be done in wiring, but you can expect with quotes about $75 for the service call and $70/hour for his/her time. $40 to $100 per hour is typical.