SEATTLE (Reuters) - Boeing U.S. factory workers rejected a new wage offer on Wednesday, extending a strike that is crippling the finances of the troubled planemaker and its suppliers.

Boeing's biggest union said 64% of its some 30,000 workers in the U.S. Pacific Northwest voted against the contract, which included a 35% pay increase spread over four years.

(Reporting by Daniel Catchpole; writing by Joe Brock; Editing by Muralikumar Anantharaman)