Eurostar saw passenger numbers rise 2% to 5 million in the first half of 2014.
Sales revenues also grew by 0.5% to £456 million.
But, half-year figures for leisure travel were hit by the World Cup, and also by the convergence of the Easter and May holidays in the UK which saw consumers travelling only once instead of twice.
"Whilst a number of factors in the second quarter of the year lead to a dampening in demand, we are now beginning to see a more benign trading environment with encouraging signs of economic stability in France as well as the UK," said chief executive Nicolas Petrovic.
"These more favourable conditions have helped deliver strong growth in business travel across our markets."
The volume of business passengers rose 6% compared to the same period in 2013.
