(MONEY Magazine) – Book a Spot Online

It can get you a 10% discount. It also guarantees you a parking space. (So you don't have to worry that your flight will take off while you circle endlessly for a spot.) You get perks like baggage help and valet parking. Some places even wash your car. Check out parknflynetwork.com, longtermparking.com and airportparkingreservations.com.

At DFW International in Dallas, for example, get an overnight stay, 14 days of parking and a shuttle to the airport two miles away for $65. Review programs for more than 100 airports at parksleepfly.com.

Many airport parking companies offer airline-like loyalty programs. Typical deal: Park for 30 days with the same place and earn a free week of parking. --DONNA ROSATO