The rail operator, which connects London St Pancras with France, Brussels and Amsterdam, is running just 10 trains on Friday. It would usually be operating 56.
The reduced timetable will continue for the coming weeks and customers are advised to check with the company website for further updates.
However, there are still trains running to all destinations and the usual terms and conditions apply.
A statement from Mike Cooper, CEO of Eurostar, was posted to the company website. He said: “On behalf of everyone at Eurostar, thank you for your understanding at a difficult time. The situation is changing by the hour, and both you – our customers – and our teams are facing unprecedented challenges.
“We’re working hard to maintain an essential service, keeping in mind that so many individuals, families and businesses are relying on us.
READ MORE: Martin Lewis: Coronavirus travel insurance advice for panicked Britons