Travelling by Eurostar? Get discount fares to Waterloo International.   There are some discount fares for travel to Waterloo International which include the journey into London and the tube to Waterloo. Just select “London International” as your destination. Please note the conditions of these fares state that you must have proof of onward Eurostar travel. An email with a ticket on departure reference number will be OK for this if you haven’t opted to have your tickets sent to you. South West Trains are the exception to this, they insist on you having the tickets.