A number of airlines canceled more than 40 flights into the capital when the Popocatepetl volcano, which has been has been rumbling all year, began spewing ash and steam this week, the BBC reported.
US Airways, Delta, United, American and Alaska Airlines canceled flights Thursday before returning to normal schedules Friday.
Flights to Mexico City from Houston, Dallas, Denver, Phoenix, Chicago and Los Angeles were affected by the cancellations.
"We are closely monitoring the situation in Mexico City as volcanic ash continues to be emitted from Popocatepetl," American Airlines spokesman Matt Miller said.
Mexican authorities have established a 7-mile no-fly zone around the volcano, 40 miles southeast of the Mexico City airport.
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