Quickest 3h 5min
There are 1 train company operating 2 routes - 125 (GW), 123 (GW), 4 buses2 flights from Brentford to Cardiff. The cheapest train costs $46 and is 3h 45min.
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There are 4 ways to travel from Brentford to Cardiff. 2 trains, 4 buses, 2 flights and 1 by car are possible between the two areas. The by car from Brentford to Cardiff is the cheapest. The by car from Brentford to Cardiff is the fastest. The train operated by running from Brentford to Cardiff 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!