The average train between Cardiff and Saint-Omer takes 7h 50m and the fastest train takes 5h 10m. The train service runs several times per day from Cardiff to Saint-Omer. 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 4 hours between Cardiff and Saint-Omer. The earliest departure is at 5:14 AM in the morning, and the last departure from Cardiff is at 9:20 PM which arrives into Saint-Omer at 11:00 AM. All services require a transfer at London Paddington and take an average of 7h 50m. The schedules shown below are for the next available departures.




6h 36m • 4 changes




6h 42m • 4 changes




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6h 41m • 4 changes




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6h 10m • 4 changes




7h 4m • 4 changes




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7h 3m • 4 changes
Want to know about travelling from Cardiff to Saint-Omer? 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 Cardiff to Saint-Omer. However, there are services departing from Cardiff station and arriving at Saint-Omer station via London Paddington. The journey, including transfers, takes approximately 7h 50m.
Cardiff to Saint-Omer train services, operated by Great Western Railway (GWR), depart from Cardiff Central station.
Cardiff to Saint-Omer train services, operated by Great Western Railway (GWR), arrive at St Omer station.
Book your Cardiff to Saint-Omer train tickets online with Great Western Railway (GWR), London Underground (Tube) and 3 other operators.
The distance between Cardiff and Saint-Omer is 388.3 km. The road distance is 564 km.
You can take a train from Cardiff Central to St Omer via London Paddington, Paddington, King's Cross St. Pancras station, London St Pancras Intl, Lille Europe, Lille Europe, Gare Lille Flandres, and Lille Flandres in around 5h 45m.