Silver Spring, MD actually borders Washington, DC so not very far at all but depending on where you're coming from or headed in either area it could be up to a 15 mile distance.
3 miles south
The nearest major airport is Ronald Reagan Washington National Airport (DCA / KDCA). This airport has international and domestic flights from Washington, District of Columbia and is about 10 miles from the center of Silver Spring, MD.
It is 20.5 miles according to Google Maps.
The Arlington National Cemetery is directly across the Potomac, about 3 miles from downtown Washington.
the airport is about 10 miles (16 km) south of Baltimore
The shortest driving distance is 547 miles.
126 miles
The air distance from Silver Spring, Maryland, to Lebanon, Pennsylvania, is 99 miles. That equals 159 kilometers or 86 nautical miles.
875 miles up I-5. You can bypass downtown Portland, Oregon via I-205 (EXIT 288 off I-5) and you can also bypass downtown Seattle, Washington via I-405 (EXIT 154B off I-5).
120
390 miles on 29 430 miles on I-81