From Baltimore Washington International (BWI) Airport:
Follow the exit road out of BWI Airport and follow the signs for the Baltimore Washington Parkway, Rt. 295 towards Washington. You will be on 295 for approximately 20-30 minutes. Take the Rt. 193-Greenbelt Road/ College Park/ NASA Goddard Exit. At the first traffic light make a left, make another left at next light onto Greenbelt Road. Follow Greenbelt Road for approximately 2 miles to NASA Goddard Space Flight Center, which will be on your left.

From Washington National Airport:
Leaving the airport you will be on the George Washington Memorial Parkway North. Bear to the right onto 395 North. You will go over the 14 the Street bridge, continue to follow signs for 395 North, following signs for I-295 North (Baltimore Washington Parkway). Stay on 295 North for approximately 5 miles and take the exit for Greenbelt Road (this is just after the exits for I-95). Make a left at the stoplight. This will be Greenbelt Road (Rt. 193). Follow Greenbelt Road for approximately 2 miles to NASA Goddard Space Flight Center, which will be on your left.

From Dulles International Airport:
Follow the Dulles Access Road to I-495. Take the first access ramp for Baltimore/Silver Spring/Bethesda. Stay on I-495 for approximately 45 minutes. Take exit 23 (Kenilworth Avenue), when exiting you will bear to the right. Proceed to the light following signs for Greenbelt Road (193). Make a left at the traffic light onto Greenbelt Road. Follow Greenbelt Road for approximately 3 miles to NASA Goddard Space Flight Center, which will be on your left.

North of Maryland:
Take I-95 South past Baltimore toward Washington, DC. Proceed to exit 23 (Kenilworth Avenue). When exiting you will bear to the right. Proceed to the light following signs for Greenbelt Road (Rt. 193). Make a left at the traffic light onto Greenbelt Road. Follow Greenbelt Road for approximately 3 miles to NASA Goddard Space Flight Center, which will be on your left.

South of Maryland:
Take I-95 North towards Baltimore, take exit 22A onto Greenbelt Road (193). Follow Greenbelt Rd. for approximately 2 miles to NASA Goddard Space Flight Center, which will be on your left.