depends on the location,length of travel and amount of business the limo service does.

here are some examples.

Upland-ONT
Stupid-Shuttle $20 plus $8 per person over 1st person, plus tip, 3 hour pickup prior to flight, return trip takes almost 2 hours while waiting for pickup of other passengers

Limo $54 including tip, no limit on passengers up to 4, 20 minute trip either way.

Upland-LAX
Stupid-Shuttle $50 plus tip plus $15 per person over 1st person, 4 hours before flight pickup, return, at least 3 hours to pick up and drop off other passengers.

Limo, $102 including tip up to 4. 1 hour trip.

the shuttle services do have discounts from one airport to another, so LAX-ONT is about $30.

Shop around

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