Sunday evening turned troublesome for Alaska Airlines and thousands of its passengers when the carrier experienced an IT outage and issued a system-wide ground stop for Alaska Airlines and Horizons Air flights to address the issue.
— Alaska Airlines (@AlaskaAir) July 21, 2025
The ground stop lasted just a few hours, but it may take days to get all affected passengers to their destinations.
“As we reposition our aircraft and crews, there will most likely be residual impacts to our flights. It will take some time to get our overall operations back to normal,” the airline said in a statement.
As of 4 am EST, Alaska Airlines had not posted a travel advisory on its site for affected travelers, but if you’ve got a flight booked on Alaska Airlines or Horizon Air this week, be sure to check on the flight status before leaving home.
Alaska Airlines has resolved its earlier IT outage and has resumed operations. We sincerely apologize for the inconvenience, and encourage guests to check your flight status before heading to the airport.
— Alaska Airlines (@AlaskaAir) July 21, 2025

In June, Hawaiian Airlines, which became part of Alaska Airlines last September, reported a cybersecurity event that affected some of its IT systems, but no word yet if these incidents are related.
Hawaiian Airlines is addressing a cybersecurity event that has affected some of our IT systems. Our highest priority is the safety and security of our guests and employees. Flights are operating safely. We will share updates as available.
— Hawaiian Airlines (@HawaiianAir) June 26, 2025