The Homer Tunnel. PHOTO: HAMISH MCNEILLY.

Travellers wishing to make an overnight trip to Milford Sound on State Highway 94 will not be able to for the next three months, due to maintenance work.

NZ Transport Agency said the Homer Tunnel between Te Anau and Milford Sound will close, starting Monday April 29, between the hours of 7pm and 4am, Sunday to Thursday.

The tunnel's maintenance may have an affect on motorists' plans until June 13.