Use the scheduled departure horizon to interpret the DOT timing guidance: within seven days, updates follow the airline’s awareness by 30 minutes or sooner; more than a week ahead, notice is as soon as practical, without a specific legal timeframe or method.
Check the departure horizon
First check the scheduled departure date. If the flight is scheduled to depart within seven days, including the seven-day window, the DOT says the airline must provide a status update 30 minutes or sooner after becoming aware of a status change. The rule described here concerns timing after the airline learns of the change, not a promise that the flight will operate on time.
Know which channels the source names
For flights departing within seven days, the DOT says status information must be available at a minimum on the airline’s website and telephone reservation system. U.S. airport flight-status displays and other information sources under the airline’s control must also be updated within 30 minutes after the airline becomes aware of the problem.
For a flight more than a week away
For itinerary changes involving a flight scheduled more than a week in the future, the DOT says notification should be provided as soon as practical. The source says no specific timeframe or method for that notice has been set forth in law. Keep that distinction in mind when comparing an early schedule change with a near-term disruption.
Record what happened
For a useful follow-up, note the scheduled departure date, when you learned of the change, and which airline status channel you checked. These details help describe the timing question; they do not establish why the disruption occurred or decide any separate refund or amenity question.
Sources & scope
An AI-assisted explainer checked against the linked primary sources. Source review dates are not necessarily announcement dates.