Hundreds of flights at SFO were canceled or delayed Monday mostly due to weather, airport officials said.
As of about 6:30 p.m. Monday, 121 flights had been canceled and 551 had been delayed at San Francisco International Airport because of weather at the airport and across the country, SFO officials said.
The Federal Aviation Administration issued a ground delay program at SFO that was to remain in effect until midnight Tuesday. The delay program limits the number of planes that can land at the airport because of the runway configuration and the weather.
Arrivals to SFO also were being affected by departure delays at Logan International Airport in Boston and Newark International Airport in New Jersey because of the weather in those areas.
SFO officials urged travelers to check the flight's status with the individual airline.