There are 2 bus companies operating 4 routes, 1 train company operating 9 routes - Northeast Regional, Silver Star, Crescent, Acela Express, Vermonter, Piedmont, Cardinal, Shuttle, Pennsylvanian, 3 airlines operating 4 routes. The cheapest bus costs $10 and is 4h 5min. The cheapest train costs $24 and is 2h 23min. The cheapest flight costs $131 and is 3h 40min.
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There are 4 ways to travel from Washington, D.C. to Philadelphia. 4 buses, 3 trains, 4 flights and 1 by car are possible between the two areas. The bus operated by Greyhound running from Washington to Philadelphia is the cheapest and fastest. The train operated by Amtrak running from WAS to PHL is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!
There are several bus companies - Greyhound, Peter Pan / Greyhound - scheduled to run from Washington, D.C. to Philadelphia. Since there are multiple companies, this should increase your chances of finding a cheaper or discount bus ticket. One train provider, Amtrak, runs trains from Washington, D.C. to Philadelphia. Because the bus is cheapest, we recommend taking the bus.