Thousands of supporters - outnumbered by security forces - waited from dawn for a glimpse of Thailand's first female prime minister, but she did not show, with a senior party source telling AFP she is "likely in Singapore".
If her flight is confirmed, Yingluck will have joined her billionaire brother Thaksin in self-exile - a knock-out blow to the family and their political ambitions.
Yingluck's government was removed by a military coup in 2014.
In a day of high drama, Yingluck ducked her court hearing for negligence over a flagship rice subsidy policy, which carried up to 10 years in prison and a life ban from politics.
"Her lawyer said she is sick and asked to delay the ruling... The court does not believe she is sick... And has decided to issue an arrest warrant," fearing she may flee the country, lead judge Cheep Chulamon told the court, rescheduling the verdict to September 27.
Thai junta chief Prayut Chan-O-Cha denied knowledge of her whereabouts but ordered border checkpoints "to be stepped up," while his number-two Prawit Wongsuwon said it was "possible" Yingluck had fled through neighbouring Cambodia.
A senior source in the Shinawatras Pheu Thai party told AFP that "as of now she is likely in Singapore... It's impossible she left without the military greenlight."
Yingluck's brother, Thaksin Shinawatra also a former premier, fled Thailand in 2008 before he was convicted of graft and handed a two year jail term.
He is believed to use a Montenegrin passport to travel between homes in Dubai, London, Hong Kong and Singapore.
The clan had clung on in Thailand's treacherous political game for more than a decade despite two coups, deadly protests, a cascade of legal cases and huge asset seizures.
Thaksin remains a galvanising force for his party and a canny political operator.
But analysts say if both siblings are now in exile their time in Thailand's spin dryer political arena is over.
"With two family members as fugitives, the family loses political legitimacy," she said, adding that Yingluck's departure would be welcomed by a Thai junta weary of the prospect of her political martyrdom in jail.
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