Logan Airport offers short term, long term, and extended-stay parking options. Terminals G and E have lots, and there is a central parking garage. The economy lots are further out and require you to take a free shuttle bus to your terminal.
There are hourly and daily rates available in all parking locations. Overnight parking ranges from $36 to $48 daily, as of October 2010. Depending on how long you need to park, you can pick the location that fits within your budget.
Because Logan Airport is so busy, it is wise to check on the parking availability to ensure a spot. You can check the current parking conditions on Logan Radio located at am1650 on your radio while driving to the airport.