Strike action and poor weather also led to Euro Disney posting a nine-percent drop in sales to 327 million euros ($363 million) between April and June, it said in a statement.
It blamed "difficult" external factors, including the jihadist shootings and suicide bombings in Paris that left 130 people dead in November and the Brussels attack in March that killed 32 people.
Tourism in France has taken a further battering more recently after an Algerian driver plunged his lorry into crowds celebrating Bastille Day in the city of Nice on July 14, killing 85 people.
Euro Disney's turnover for April-June was down 13 percent to 182 million euros, with visitor numbers dropping 11 percent and the average visitor spending two percent less.
The group added that operating costs had gone up due to efforts to "improve the visitor experience" as Disneyland Paris gears up for its 25th anniversary next year, as well as extra security costs following the attacks.
Real estate activities were the only cause for cheer, earning three million euros in the quarter thanks to land sales compared to a million euros a year earlier.