NEW YORK – Holiday travelers may want to lock in airfares now because they’re going up.

Major airlines are joining in the first widespread airfare increase since early August. The hike was initiated by Delta Air Lines late Tuesday when it raised fares by $4 to $10 on roundtrip flights across most of its U.S. routes, said Rick Seaney of Farecompare.com. Soon after, United Continental Holdings matched the increases.

By Wednesday, every other major airline had raised fares, including Southwest, according to JPMorgan’s Jamie Baker.

Airlines have tried to raise prices as many as 19 times this year.