Quickest 3h 5min
There are 1 train company operating 2 routes - 123 (GW), 125 (GW), 4 buses and 2 flights from Cardiff to Brentford. The cheapest train costs $46 and is 3h 49min.
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There are 4 ways to travel from Cardiff to Brentford. 2 trains, 4 buses, 2 flights and 1 by car are possible between the two areas. The by car from Cardiff to Brentford is the cheapest. The by car from Cardiff to Brentford is the fastest. The train operated by running from Cardiff to Brentford 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!