You have no more of a chance of being a victim of a crime on Metro than you would on street level. I absolutely think you will be perfectly safe on metro any time of day. Don't waste your money on a taxi.
People Also Ask
There is a reliable Washington DC police presence, especially around the main tourist areas, and violent crimes are generally very low. As a solo traveler, you'll just need to do your research to avoid dangerous areas and take extra caution when making your way through the city after dark.
Metro Fare BasicsSmarTrip® cards are used to pay fares on both Metrorail and Metrobus. Metrorail fares are variable depending on time-of-day and distance traveled. Regular (non-express) bus fares are the same throughout the system. Metrobus also accepts bills and coins.