The average train between Watford and Slough takes 1h 20m and the fastest train takes 1h 4m. The train runs at least 2 times per hour from Watford to Slough. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Trains run every 30 minutes between Watford and Slough. The earliest departure is at 5:13 AM in the morning, and the last departure from Watford is at 11:42 PM which arrives into Slough at 12:49 AM. All services require a transfer at Harrow & Wealdstone and take an average of 1h 20m. The schedules shown below are for the next available departures.


1h 25m • 2 changes

1h 20m • 2 changes

1h 11m • 2 changes

1h 16m • 2 changesWant to know about travelling from Watford to Slough? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct train from Watford to Slough. However, there are services departing from Watford station and arriving at Slough station via Paddington station station. The journey, including transfers, takes approximately 1h 20m.
Watford to Slough train services, operated by London Overground, depart from Harrow & Wealdstone station.
Watford to Slough train services, operated by London Overground, arrive at Slough station.
Book your Watford to Slough train tickets online with London Overground, London Underground (Tube) and 4 other operators.
The distance between Watford and Slough is 21.3 km. The road distance is 55 km.
There is no direct connection from Watford to Slough. However, you can take the train to Harrow & Wealdstone, walk to Harrow & Wealdstone station, take the subway to Paddington station, walk to London Paddington, then take the train to Slough.