Car rental services at BWI airport

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Save money. Book in advance
Renting a car at the airport is a good idea, especially if your final destination is the Washington DC area, due to the long distances that make up the metropolitan area. To rent a car at the airport is a good idea, BWI Marshall rental car facility is located between Stoney Run Road and New Ridge Road, which is on the west wide of the terminal building.
All the car rental companies listed below are serving at the airport. Passengers can get there by the Courtesy Rental Car Facility Shuttle, which runs between the Main Terminal and the Car Rental Facility every 8-10 minutes (every 25 minutes from 1 am to 5 am). The free shuttle buses depart from the lower level terminal.
It is recommended to have a prior reservation. Look for availability HERE
Car rental companies

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What to consider before renting a car
Always beeing with a vehicle has its comforts and advantages. Although the Washington Baltimore area is well served by public transportation, there are many places that are worth visiting and long distance are common.
However, like in any metropolitan area, especially in the nation's capital downtown access area, you should take into account that during rush hours traffic is usually heavy and there may be traffic jams (especially during peak hours). You should also consider extra costs when renting your car. That is, in addition to the fuel that you will have to replace before returning the vehicle, keep in mind that many access roads to the different points of the metropolitan area have toll fees.
In addition to your valid driver's license (whether national or international), be sure to rent a car with full insurance, with an authorized agency and present at the airport, have a GPS at hand (if the vehicle does not include a GPS Navigation system).
Needless to say, you must respect all traffic signs, speed limits and not drink alcohol if you are going to drive. If you live in the United States, you will already know this, but if you are a foreigner you should be clear that the North American authorities are usually very strict in respect of the rules and consequently, the punishments are usually very severe in case of any infraction.
In downtown areas, try to find private parking lots, especially during business hours because there is often very little space available, and in turn to avoid unexpected fines.