Also bookable on Viator, 1 to 120 of 773
The same city on Viator (Tripadvisor's marketplace), top rated first: a third place to compare dates and prices.
Prices run from USD1 to USD4069, and half of the 773 priced listings cost USD100 or less. Most take 2 hours to 4 hours. The best reviewed with at least 100 reviews is Arlington Cemetery & Changing of the Guard Exclusive Guided Tour (5.0 from 157 reviews). The most reviewed is DC Monuments by Night: 10+ Landmarks | Open-Top Upgrade Available (7,290 reviews).
For the operators we researched and recommend, see our food tours and cooking classes in Washington DC, or the experiences overview.