Cheap Train tickets to Dover, NH, US

What are the most popular routes to Dover?

Boston - DoverAverage pricePLN 113Average duration1h 30mDaily departures6
New York City - DoverAverage pricePLN 720Average duration7h 50mDaily departures7
Portland - DoverAverage pricePLN 64Average duration59mDaily departures5
Washington - DoverAverage pricePLN 1,228Average duration11h 44mDaily departures6
Providence - DoverAverage pricePLN 351Average duration4h 18mDaily departures6