Delta Air Lines alone canceled at least 224 flights on Sunday. United Airlines canceled 71 flights and American Airlines canceled 66 flights.
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CNN has reached out to the three airlines for comment on flight cancellations.
"Delta teams continue to safely manage through compounding factors affecting our operation this weekend, including higher-than-planned unscheduled absences in some of our work groups, weather, and air traffic control constraints," a Delta Air Lines spokesperson said. "Canceling a flight is always our last resort, and we sincerely apologize to our customers for any disruption to their travel plans."
Atlanta's Hartsfield-Jackson International Airport was most impacted by Sunday's cancellations.
United Airlines canceled 56 flights on Saturday and 70 flights Sunday.
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United Airlines said on Thursday it would cut 12% of its daily domestic flights from its busy Newark hub. The cuts start in July and amount to about 50 daily flights.
According to FlightAware, there were 634 flight cancellations Saturday.