The nor'easter upending travel plans along the East Coast will cost airlines about $10 million, according to an estimate issued Tuesday by masFlight, an aviation analysis firm that is part of Mark Systems Inc. of Bethesda, Md.

The firm attributed 7,800 flight cancellations to the storm, with more than 30% occurring at the three major New York airports. Philadelphia, Boston, Washington, D.C., and Chicago were the other top cities for cancellations, masFlight said.

Still, illustrating that January can generally be a rocky time for a plane trip, masFlight said the scope of the cancellations from the nor'easter--dubbed "Juno" by The Weather Channel--doesn't compare with flight snafus the same time last year.

"January 2015 winter weather conditions are running 66% below 2014 and are actually more typical of January winter weather cancellations," masFlight said.

The firm's analysis said airlines had accounted for most of the costs of the latest round of canceled flights in financial projections. "We do not expect that Juno will have a material impact on airline financial performance for 1Q," masFlight said.

Write to Jennifer Levitz at jennifer.levits@wsj.com

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