Three Canadian charter flights will depart from Poland in the coming weeks to bring Ukrainians fleeing the Russian invasion.

Immigration Minister Sean Fraser said the flights will be available to more than 90,000 Ukrainians approved for emergency travel to Canada.

Fraser says, "The first flight will depart to Winnipeg on May 23, the second to Montreal on May 29, and the third to Halifax will take off on June 2."

The government says thousands of Ukrainians have arrived in Canada since Russian forces first attacked in late February, and Fraser says it is unclear how many will come.

He told reporters on Wednesday, "So far we have seen about 92,000 approvals through the emergency program mostly since the end of March, and they are now being processed very quickly, so I expect this number to continue to grow."

Transport Minister Omar Alghabra said the government still faces logistical challenges in helping Ukrainians wishing to flee to Canada.

He added, "It still takes a lot of effort to determine where the applicants are, where they can depart from, and where they want to settle in Canada."