There are 4 buses1 train company operating 3 routes - Northeast Regional, Acela Express, Shuttle, 2 flights from Middletown to Boston. The cheapest train costs $13 and is 1h 15min.
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There are 4 ways to travel from Middletown to Boston. 4 buses, 2 trains, 2 flights and 1 by car are possible between the two areas. The by car from Middletown to Boston is the cheapest. The train operated by Amtrak running from PVD to BBY is the fastest. The train operated by Amtrak running from KIN to BOS 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!