The suspect squeezed into a turnstile with the woman and groped her, police said.
The Roosevelt Avenue station is the second busiest in Queens.
The suspect hit the victim in the mouth and the nose, and fled, officials said.
Lines affected are the 1, 2, 6, 7, A, F, G, Q, N, R and the Times Square shuttle.
MTA work will affect the 4, 5, 6, A, C, E, J, M, N, Q and R lines.
Construction and maintenance work will bring changes to the 6, A, C, E, F, G, J, L, N, Q and R lines.
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