There are multiple routes to travel from Boston to Washington, DC. How much tolls you would pay on a particular route depends on the vehicle you drive (no. of axles), time of your travel (peak or off-peak hours) and payment method (tag, cash or video/pay-by-mail). Tollguru toll calculator shows toll costs for both the fastest and the cheapest routes. While the fastest route takes the least amount of time, the cheapest route has the least combined cost (tolls + gas).
Please note that the fastest and the cheapest route may change depending on the traffic conditions and time of your travel. The toll rates shown below are for 2-axle auto.