Quickest 2h 39min
There are 1 flight2 train companies operating 4 routes - 1, 70, 131, 130, and 4 buses from BTS to BUD. The cheapest train costs $22 and is 2h 39min.
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There are 4 ways to travel from BTS to BUD. 1 flight, 3 trains, 4 buses and 1 by car are possible between the two areas. The by car from BTS to BUD is the cheapest. The train operated by MÁV running from Rajka to Budapest-Keleti is the fastest. The train operated by running from Bratislava to Budapest 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!