Direct Eurostar trains will begin running from Amsterdam to London from October 26, with tickets now on sale.
There is a six-month booking window, and the cross-Channel operator is currently offering fares as exchangeable with no fee up to 14 days before departure (for all bookings made until December 31).
Journey times to London are expected to be 4hrs 9mins from Amsterdam and 3hrs 29mins from Rotterdam.
Trains had been running since the launch of the London-Amsterdam route, although returning UK passengers had to catch a Thalys train to Brussels, where they passed through border control before boarding a Eurostar service.
Eurostar has also confirmed that it is still running trains to Paris and Brussels despite Government reintroducing quarantining for passengers returning to the UK.
The operator told RAIL: “We are continuing to monitor demand, and adapting our timetable to reflect that.”