Strong international hotel sales pushed's profits up 74%, with the online travel agency reporting first-quarter income of $182 million.

Priceline said international bookings increased 54%, driven by strong results from European sites and, as well as strength from domestic car rentals.

The OTA booked 46 million room nights in the first quarter, up 47% over the same period of 2011.

Priceline sold 6.9 million rental car days, a 40.6% increase. CEO Jeffery Boyd said results "reflected improved results in the U.S. business and the growing contribution from"

The company's first-quarter revenue surged 28%, to $1.03 billion.

Boyd said economic difficulties in Europe had slowed Priceline's growth.

"Economic conditions in Europe remain a challenge and are reflected in the lower relative growth rates in southern peripheral countries and a weakening of the euro, which puts pressure on our dollar-denominated results," Boyd said. "We also now see changes in the political environment which add additional uncertainty."

Follow Johanna Jainchill on Twitter @jjainchilltw.

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