CORAOPOLIS, PA. AUG. 13 -- USAir Group Inc. said today it would lay off about 200 pilots in a cutback that could also affect flight attendants and other employees, a spokeswoman for the airline said.

''We will not fly as much new service as originally planned, in view of the state of the economy,'' spokeswoman Susan Young said about the layoffs. She said she could not elaborate on the number involved or when the employees might be let go.

Earlier today, the Air Line Pilots Association announced to members that the Arlington, Va.-based carrier had decided to lay off 211 pilots around the end of the year.

The union told its members in a tape-recorded telephone message that it learned of the plans last week in Los Angeles during a meeting with USAir President Seth Schofield and other airline executives.

USAir Group lost $113.1 million in the first half of this year and has not posted a profit since the second quarter of 1989.

''I think it's safe to say that the airline's traffic and the industry's traffic is flat,'' she said.

She also said the airline may have too many pilots for its fleet. The excess could have resulted from ''older aircraft and rescheduling of aircraft deliveries,'' she said. USAir delayed taking delivery of 12 new jets this year in an unusual cost-cutting move.

It also has tried to save money by paying less overtime to maintenance crews.

The union message said Schofield told the pilots' Master Executive Council that USAir sees a further decline in traffic and higher fuel prices.

The vice chairman of ALPA's Master Executive Council, Chris Beebe, urged the pilots to adhere exactly to the wording in their contract and not to fly overtime.