"I expect there will be a general election within 60 days, as stated in the constitution," Ms Sodsri said, after Prime Minister Yingluck Shinawatra announced a House dissolution on national television about 8.45am.
Sixty days from Dec 9 is Feb 7, 2014, a Friday. She suggested Feb 2, a Sunday.
The commissioner said members of the Democrat Party who had resigned from the House could register again and contest the polls.
The EC will cancel the plan for by-elections on Dec 22 to fill eight seats previously left vacant by the resignation of Democrat MPs, she added.
Last month, nine Democrat MPs, including Suthep Thaugsuban, resigned to lead an all-out protest against the Yingluck administration. One was a party-list MP, not requiring a by-election.
On Sunday, Democrat leader Abhisit Vejjajiva, accompanied by party members, announced that all 153 party MPs had agreed to resign with immediate effect.