The main reasons airlines cancel flights
Airlines cancel flights for three broad categories of reasons: weather, mechanical problems with the aircraft, and staffing shortages. Weather is the most common cause—thunderstorms, snow, fog, and high winds can make takeoff or landing unsafe, and these decisions come from the airline's operations team, not the pilots. Mechanical issues range from minor repairs that take a few hours to major problems that ground an aircraft for a day or more. Staffing shortages happen when pilots, flight attendants, or ground crew call in sick, don't show up, or are already assigned to other flights that ran late.
The difference between a cancellation and a delay matters: a delay means the flight will leave late but will leave. A cancellation means the flight will not operate at all that day. Airlines must rebook you on another flight, offer a refund, or both, depending on the reason and your airline's policy.
Key Takeaways
- Weather is the most common reason for cancellations, and airlines are not liable for weather-related cancellations under U.S. law.
- Mechanical problems and staffing shortages are within the airline's control and may may have access to you to compensation depending on your airline and ticket type.
- Cancellations spike during winter months, holiday travel periods, and after severe weather events that affect multiple airports.
- The airline must rebook you on the next available flight to your destination or refund your ticket if you choose not to travel.
- Checking your flight status the day before departure and arriving early on travel days reduces the chance you will be stranded if a cancellation occurs.
Weather and natural events
Severe weather is the leading cause of flight cancellations. Thunderstorms with heavy rain, hail, or lightning can make an airport unsafe for takeoffs and landings. Winter storms bring snow and ice that require runway de-icing and reduce visibility. High winds, fog, and volcanic ash (in regions near active volcanoes) also trigger cancellations. The airline's operations center monitors weather forecasts and radar constantly and will cancel flights hours in advance if conditions are expected to be unsafe.
Under U.S. law, airlines are not required to compensate passengers for weather-related cancellations because weather is considered an "act of God" outside the airline's control. However, the airline must still rebook you on another flight or refund your ticket. Winter months—December through February—see the highest number of weather-related cancellations. Holiday travel periods (Thanksgiving week, Christmas, New Year's) amplify the problem because more flights are operating, so a single weather event affects more passengers.
Mechanical failures and maintenance issues
Aircraft are inspected before every flight, and mechanics check engines, hydraulics, electrical systems, and safety equipment. If an inspection finds a problem—a cracked windshield, a faulty landing gear indicator, a fuel leak, or an engine that does not meet performance standards—the airline must repair it before the plane can fly. Some repairs take 30 minutes; others take hours or require parts that must be shipped in.
Unlike weather, mechanical cancellations are within the airline's control. The airline chose the maintenance schedule, the spare parts inventory, and whether to have enough mechanics on staff. In the European Union, passengers can claim compensation for mechanical cancellations. In the United States, compensation depends on your airline's policy and your ticket type—some airlines offer vouchers or rebooking on a competitor's flight, while others offer nothing. Check your airline's website or your ticket confirmation for its cancellation policy before you book.
Crew shortages and scheduling problems
A flight needs a captain, a first officer, and flight attendants. If a pilot calls in sick, oversleeps, or is stuck on a delayed flight from an earlier leg, the airline may not have a replacement ready. Flight attendants face the same problem. Ground crews—the people who load baggage, fuel the plane, and push it back from the gate—also call in sick or fail to show up. When the airline cannot find a replacement quickly, it cancels the flight rather than delay it further.
Staffing shortages have worsened since 2020. Airlines reduced their workforce during the pandemic and have struggled to rehire and train enough people to match the return of passenger demand. Regional airlines, which operate smaller planes for major carriers, are especially affected because they pay less and have higher turnover. A single sick pilot or flight attendant can cascade into multiple cancellations if that person was scheduled for several flights that day. Staffing issues are within the airline's control and can trigger compensation in some cases, though U.S. law is less clear on this than European law.
Cascading delays and the domino effect
A single cancellation or long delay early in the day can trigger a chain reaction. An aircraft that was supposed to fly from New York to Boston and then to Miami may arrive so late in Boston that it misses its Miami slot. The crew assigned to that Miami flight is now out of position. The plane itself is in the wrong city. The airline must either cancel the Miami flight, delay it while the aircraft repositions, or find a replacement aircraft and crew. During busy travel periods, there may be no replacement available.
This domino effect is worst during peak travel times—summer vacation, Thanksgiving week, Christmas, and spring break—when airlines are running most of their fleet and have little slack. A weather event that closes an airport for a few hours can take days to fully recover from because every flight that was supposed to use that airport must be rescheduled. The airline's scheduling software tries to minimize cancellations, but it cannot always prevent them once the cascade starts.
Staffing at airports and air traffic control
Cancellations also happen because of problems outside the airline itself. Air traffic control facilities manage the flow of planes in and out of airports. If an air traffic control facility is understaffed or a controller calls in sick, the facility may reduce the number of planes it can handle per hour. This creates a bottleneck, and airlines must cancel flights to stay within the reduced capacity. The Federal Aviation Administration (FAA) controls air traffic, not the airlines, so the airline cannot fix this problem on its own.
Airport ground services—baggage handling, cleaning, catering, and wheelchair information—are often contracted to third-party companies. If a contractor is short-staffed, planes may sit at the gate longer than planned, pushing back the next flight's departure. These delays can accumulate into cancellations if the aircraft falls too far behind its schedule.
How to reduce your risk of being caught in a cancellation
Check your flight status the evening before you travel and again on the morning of your flight. Most airlines send email or text alerts when a flight is cancelled, but checking yourself ensures you know as soon as the airline does. If your flight is cancelled, you will have time to rebook on another airline or adjust your plans.
Arrive at the airport early—at least two hours before a domestic flight and three hours before an international flight. If your flight is cancelled after you arrive, you will be at the front of the rebooking line. Book flights during off-peak times (early morning, late evening, weekdays) rather than peak times (afternoon, weekends, holidays) to increase the chance that a replacement flight will be available if yours is cancelled. Avoid connecting flights during bad weather season if you can, because a cancellation at your first stop will cascade to your connection.
If you are flying during winter or a holiday period, consider buying trip insurance that covers cancellations. Standard airline tickets do not refund money for weather-related cancellations, but trip insurance will. Check the policy details—some policies exclude cancellations that were foreseeable at the time you bought the insurance.
Frequently Asked Questions
Can I get money back if my flight is cancelled?
U.S. law requires the airline to rebook you on the next available flight to your destination or refund your ticket price. You cannot get additional compensation for weather-related cancellations. For cancellations caused by mechanical problems or crew shortages, compensation depends on your airline's policy—some offer hotel and meal vouchers, others offer nothing. Check your ticket confirmation or the airline's website for its specific policy.
What is the difference between a cancellation and a delay?
A delay means your flight will leave late but will operate. A cancellation means the flight will not operate at all that day. With a cancellation, the airline must rebook you or refund you. With a delay, you stay on the same flight unless you choose to rebook yourself.
Why do airlines cancel flights instead of just delaying them?
Cancelling a flight that is already several hours late allows the airline to use the aircraft and crew for other flights later in the day. If the airline delayed the flight indefinitely, the plane would sit idle and miss its next scheduled flight, causing more cancellations. Cancelling also frees up gate space for other airlines and reduces the chance of a crew exceeding their legal flight-hour limits.
Are cancellations worse in winter?
Yes. Winter months (December through February) have more weather-related cancellations because of snow, ice, and storms. Holiday travel periods amplify the problem because more flights are operating, so a single weather event affects more passengers. Spring and fall have fewer cancellations overall.
What should I do if my flight is cancelled?
Contact your airline when ready by phone, app, or website to rebook on the next available flight. If no flights are available that day, ask about hotels and meals if you must stay overnight. Keep all receipts for expenses the airline causes you to incur. If you choose not to travel, request a refund of your ticket price.