Theresa May asked the MPs to "make an honorable compromise" while trying to convince them to restore Brexit's deal with them. the third time.
Writing in the Sunday Telegraph, the prime minister said that failure to support the agreement would mean "we will not leave the EU for long months, if ever".
Mrs May is expected to return her withdrawal agreement to the
After Deaths this week she refused to discuss and voted to delay Brexit.
The EU will determine the terms and conditions of any extension.
Meanwhile, Labor leader Jeremy Corbyn wrote to MPs across the Commons inviting talks to find a cross-party compromise.
Mrs May says Parliament votes for its withdrawal deal before EU leaders summit on Thursday, the UK will seek a short delay on Brexit to run the necessary legislation.
"It's not a great result ̵
1; we could and we should be leaving the EU on 29 March," she said.
"But the British would accept it if it quickly provided Brexit. The alternative is that if Parliament cannot agree about that time much worse."
dealing before Thursday, EU leaders have a longer delay.
Mrs May said it would be "a strong symbol of Parliament's collective political failure" if Brexit's delay in the UK had to take part in the May European elections – almost three years after it voted for the European Parliament. Leave the EU.