Singer Wayne Newton, who was to perform at a concert on the Mall today, has withdrawn because organizers of the Veterans Day "Salute II" event were unable to raise the funds to pay his transportation and production costs.

Newton had agreed to entertain without charge, but the incidental expenses of $100,000 for a large road show, to be borne by the National Salute II Committee, were more than the organization could pay, according to Kelvin Hunter, a retired Army colonel who is technical consultant to the committee.

Frankie Valli and the Four Seasons, the Festival Band, and Chris Noel are expected to perform at the concert, which begins at 11 a.m.

In another schedule change, the starting time for tomorrow's ceremony dedicating the "Three Fightingmen" statue at the Vietnam Veterans Memorial has been moved back from 2 p.m. to 3:30 p.m.

The change was made to accommodate President Reagan, who will be flying from California to speak..

A Metro spokeswoman said that subway service will begin at 9 a.m. tomorrow, an hour earlier than normal, to accommodate persons attending Veterans Day activities. Trains will run from 9 a.m. until 6 p.m., the spokeswoman said.

Hunter said that the Salute II Committee, formed to coordinate this weekend's events in connection with tomorrow's dedication, has been largely unsuccessful in its efforts to raise funds.

"We put this thing together looking for support and didn't get any," he said. "We can put on the Olympics and the big corporations will jump on board. We can fix the Statue of Liberty and the big corporations come on board.

"When we try to do something for our vets, where are they? We wouldn't have a Statue of Liberty without our vets."

To supplement the limited funds that have been raised from donations, Hunter said, the rest of the committee's budget of approximately $100,000 will have to come from the sale of Veterans Day pins.

"We'll . . . make that money now by having to sell the pins we intended to give away," he said. "That's our last asset."