Carrying an increased number of American, Brazilian and Australian travellers, Eurostar saw its operating profit rise from £25.0 million in 2011 to £52.3 million in 2012.
In total, the company carried 9.9 million passengers last year compared with 9.7 million in 2011.
Passenger numbers were strong after the Olympics, with traffic up 5% in the last three months of last year compared with the October-December 2011 period.
While business passenger number remained flat last year, the leisure travel market rose 3%. Non-EU passenger numbers grew 8% in 2012.
Eurostar chief executive Nicolas Petrovic said: "Despite the challenging economic climate, we delivered a strong performance in 2012.
More top news
United in silence. People in the Thames Valley came together today to remember those killed and injured in the Manchester terror attack.
The South stood silent today - from Brighton to Basingstoke - to remember those killed and injured in the Manchester terror attack.
After the deaths of seven people at Camber Sands last summer, lifeguards will be patrolling there for the first time from this weekend.