WASHINGTON (Reuters) - The U.S. trade deficit narrowed unexpectedly in February as exports hit a record high, imports from China and other key suppliers declined and oil import volume fell to the lowest in 15 years, a government report showed on Thursday.

The monthly trade gap shrank 12.4 percent to $46.0 billion, the biggest month-to-month decline since May 2009, the Commerce Department report said. Analysts surveyed before the report had expected the deficit to narrow only slightly from January's revised estimate of $52.5 billion.

U.S. exports edged slightly higher to a record $181.2 billion, led by record exports of services and capital goods, such as civilian aircraft and industrial machines.

Exports to Canada, the biggest U.S. trade partner, grew 7.2 percent and also rose to the 27-nation European Union, China, Brazil and newly industrialized countries. Exports to Britain hit a record $5.3 billion.

Imports dropped 2.7 percent to $227.2 billion, the biggest monthly drop in three years.

Imports from Saudi Arabia and other members of the Organization of Petroleum Exporting Countries tumbled 23.3 percent, as U.S. oil imports dropped to 226 million barrels in February, the lowest level since February 1997.

The average price for imported oil fell slightly to $103.63 per barrel, but still was well above the February 2011 average price of $87.17.

Imports from China slipped 18.2 percent and also fell from other major suppliers, such as Canada and the European Union.

The closely watched U.S. trade deficit with China shrank 25.6 percent to $19.4 billion, the lowest in nearly a year.

(Reporting by Doug Palmer; Editing by Andrea Ricci)