Sun Air plans a "soft start," with two daily round-trip flights between Lancaster and Dulles International Airport, which serves Washington, D.C., Eberly said.
That will increase to four daily flights Nov. 15, and to five flights at some point after that, he said. Tickets will cost between $40 and $50, he said.
Marketing plans are still in development, he said.
Sun Air is replacing Massachusetts-based Cape Air, which will end its Lancaster flights Oct. 31.
Lancaster service is provided through the federal Essential Air Service program, which subsidizes carriers in small markets.
Sun Air President Thomas Cooper said in August he hoped to start Lancaster service Oct. 15, but he emphasized that was a tentative date.
The small, private company flies scheduled and chartered flights between Fort Lauderdale and the Bahamas. Lancaster is part of its first expansion beyond that market, along with Hagerstown, Md.