Eurostar is making 58,000 seats available at £39 one-way in a January flash sale.
The promotion run between January 10-16 and covers travel from London to Paris, Lille, Brussels and Rotterdam between January 23 and March 24.
The bulk of the tickets – 35,000 – are available on the Paris route, with 18,000 to Brussels and Lille and 5,000 to Rotterdam.
The tickets are not valid on certain days, including the weekend prior to Valentine’s Day.