To park at the Daily Garage for 15 minutes would cost you $3. As you would be charged $3 for any part of the first hour. Then for 1 hour, 1 minute up to 2 hours, $6. So, as suggested by others, park at the Hourly Garage if you will be there for 15 minutes. The rates there are $2 up to 30 minutes. Then for 31 minutes up to one hour, $4.
If you are going to park for only 15 min I'd suggest the hourly garage which is walking distance from the terminal. It costs $4 per hour.
It's a daily rate. 12 dollars. For only 15 minutes use short term at the Airport.
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