San Francisco International Airport experienced substantial flight disruptions on June 21, 2026, with a total of 225 flights delayed and eight flights cancelled. The delays and cancellations affected departures and arrivals throughout the day.
Several airlines were impacted, notably United Airlines, Frontier, SkyWest, and Air Canada. Affected routes included major U.S. cities such as Chicago, New York City, and Las Vegas, as well as international destinations including Montreal, Rome, and Seville. Passengers flying to or from these locations encountered delays and cancellations that likely required adjustments to their travel plans and extended waiting times.
