At most major airports, there are offsite long term parking alternatives that are CHEAPER than the in-house airport parking. If you can save money why not? You are just parking your car in a secured lot and pretty much the only difference between airport and non-airport is a 2 min longer ride on the shuttle bus.
Here's money you save and I myself was guilty of overpaying. SFO for 5 days was about $75 at Park N'Fly at San Francisco Intl. It's also $75 at the airport. BUT if you prepay online its only $53 at Park N'Fly. A HUGE savings of $23 dollars. The only reason I paid full price was due to a family miscommunication. The best part is Park N'Fly is in a more convenient location just a block from the freeway entrance. Good for when you want to get home ASAP after a long day travelling.
