(CNN) — Winter weather continues to disrupt holiday travel across the United States on Friday, leaving travelers facing delays and cancellations during one of the busiest times of the year.

Cancellations were highest Friday at Seattle-Tacoma International Airport, New York’s LaGuardia, Chicago O’Hare, Denver International and Detroit Metro Airport, according to FlightAware data. In Canada, Toronto topped flight cancellations.

In addition to the cancellations, there had been more than 9,100 delays as of 7:40 p.m. ET among the flights still going out.

For Saturday, more than 570 flights have already been canceled. But for Christmas Day, just 10 flights have been canceled so far.

Slammed by wind-whipped snow, Buffalo Niagara International Airport in New York had to shut down flights entirely.

At airports in Cleveland and Grand Rapids, Michigan, more than 70% of the flights have been canceled.

Ground stops

The Federal Aviation Administration posted ground stops Friday morning for flights bound for Charlotte Douglas International Airport in North Carolina, American Airlines’ second largest hub, and Reagan National Airport near Washington, DC, because of deicing.

In the Pacific Northwest, FAA notices showed flights bound to Seattle-Tacoma International Airport and Portland International Airport were also under ground stops Friday morning because of snow and ice.

The FAA says the major air pressure changes associated with this storm will trigger high winds at airports from Boston down to Atlanta.

Airports in Chicago and Denver saw the bulk of cancellations and delays on Thursday. Chicago O’Hare International Airport was logging average delays Thursday of almost three hours due to snow and ice.

Storm has bad timing

The growing cancellations make it harder for passengers racing against the clock and weather to rebook and arrive in time for Christmas. Flights this year were already more crowded than they’ve been previously — even before the storm disrupted travel schedules.

“The planes that are actually flying are more full today than they were pre-pandemic. That’s why there’s not as many empty seats to switch onto if you do find your flight gets canceled or delayed,” Keyes said.

Train and bus service hit, too

Amtrak has also been forced to delay or cancel passenger service for some lines in the Midwest and Northeast.

In its notice, Amtrak said “customers with reservations on trains that are being modified will typically be accommodated on trains with similar departure times or another day.

“Amtrak will waive additional charges for customers looking to change their reservation during the modified schedule by calling our reservation center at 1-800-USA-RAIL.”

Meanwhile Greyhound, the largest provider of intercity bus service, issued a service alert Thursday evening indicating that trips in the Midwest or upper Northeast may be canceled or disrupted.

Greyhound said riders can call 1-833-233-8507 to reschedule.

Winter weather is also impacting the services of regional intercity bus company Jefferson Lines, which operates in 14 states.

One traveler’s story

Shane Phillips told CNN he was set to fly from Los Angeles to Seattle to visit family, but when he woke up Friday morning, his Alaska Airlines flight had been canceled.

This would have been Phillips’ first time back to Washington State since before the Covid-19 pandemic.

“I would say they’re (his family) upset, but they’re the ones experiencing the crazy weather, so they understand,” he said.

Phillips says he feels mostly disappointment but not a lot of surprise. “I knew the weather was supposed to be bad, but I was hoping I’d get in before the freezing rain hit,” he added.

Phillips’ family lives about two hours north of Seattle, so if he did make it to the airport, he says he could’ve been stranded. “They totally shut down transit, so I’m not sure how I would’ve left the airport,” Phillips said.

Other airlines had flights available for Saturday, but Phillips said they were priced at $1,000 one-way, “which is just too much.”

Phillips says he will make the best of things — as he’s now planning to attend a friend’s holiday party he would have missed if he’d made it to Seattle.

Pete Muntean, Gregory Wallace, Rebekah Riess, Danielle Sills, Marnie Hunter, Ross Levitt, Dave Hennen, Paul P. Murphy, Carol Alvarado and Sara Smart contributed to this report.