Engineering work is taking place between Cosham and Portsmouth Harbour, closing some lines.
The 04:50 Fratton to Bristol Temple Meads will start from Southampton Central. Customers from Fratton, Cosham, Portchester and Fareham should travel by later services.
The 06:01 Portsmouth Harbour to Cardiff Central will start from Fareham. Customers from Portsmouth Harbour, Portsmouth & Southsea, Fratton and Cosham should travel by earlier or later services.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner.