The automaker has suspended operations at its factory in central Thailand for weeks, with no sign of a restart.
The company believes it will have to replace most of its equipment and facilities that were submerged by floodwaters, the Nikkei said, citing a company executive.
Honda is the only Japanese carmaker whose Thai factory was inundated, the paper said.
The half-year suspension would affect production of more than 100,000 vehicles, it said.
Honda reports second-quarter earnings on Monday, with its profit forecast to fall 61 percent, according to a Reuters survey of 13 analysts. A supply shortage caused by a devastating March earthquake in northeast Japan has dragged on longer than it has for Honda's peers.
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