Southern Railways is one of the main overground trains that run from London to South England. Use the website listed below to help plan your journey and check availability of tickets and train fares. If you plan ahead it’s sometimes best to try to book tickets direct from the railways website as opposed to a 3rd party train ticket seller.
Train fares in the UK are not fixed rates (except for the London underground). Fare prices fluctuate based on availability, so unfortuantely you are forced to plan ahead for any journey as you can except to pay extremely high rates if you book the day of your travel.