A total of 5,133,747 Ukrainians have fled the country since Russia invaded on February 24, the UN refugee agency said on Friday.
The figure marks an increase of 48,387 from Thursday’s data, UNHCR said.
Some 1,098,000 Ukrainians have left the country during April so far, compared with 3.4 million for the whole of March.
Women and children account for 90 percent of those who fled abroad, with men aged 18 to 60 eligible for military call-up unable to leave.
The UN’s International Organization for Migration, IOM said an additional 218,000 citizens of third countries largely students and migrant workers have also escaped to neighbouring countries.
Beyond the refugees, the IOM estimates 7.7 million people are displaced within in Ukraine.
Before the invasion, Ukraine had a population of 37 million in the regions under government control, excluding Russia-annexed Crimea and the pro-Russian separatist-controlled regions in the east.
Meanwhile, 1.1 million Ukrainians have returned to their country since the war began.