How to find out what caused your flight delay or cancellation
Your airline's website or app is the fastest place to check. Log in with your confirmation number or ticket number, and most carriers show a reason code — weather, mechanical issue, crew scheduling, air traffic control, or staffing. The reason matters because it determines whether you're owed money under U.S. Department of Transportation rules.
If the website doesn't explain it clearly, call the airline's customer service line. Have your confirmation number ready. Ask specifically whether the delay was within the airline's control (mechanical failure, crew shortage, overbooking) or outside it (weather, military airspace closure, air traffic delays). The agent should tell you which category applies to your flight.
For cancelled flights, the airline must tell you the reason before rebooking you. If they don't volunteer it, ask. Write down what they say — you may need it later if you file a complaint or pursue compensation.
Key Takeaways
- Check your airline's website or app first using your confirmation number to see the reason code for your delay or cancellation.
- Delays caused by weather, military airspace, or air traffic control do not trigger airline compensation, but mechanical failures and crew issues do.
- Call the airline's customer service line and ask the agent to state the reason category — within the airline's control or outside it — and request they note it in your record.
- The U.S. Department of Transportation requires airlines to rebook you on the next available flight at no extra cost, regardless of the reason.
- Keep your confirmation number, boarding pass, and any written communication from the airline in case you need to file a complaint later.
Delays caused by weather and natural events
Weather delays are the most common reason flights are held on the ground or cancelled. This includes thunderstorms, heavy snow, fog, high winds, or volcanic ash. The Federal Aviation Administration (FAA) may also issue ground stops that affect entire airports or regions when conditions are unsafe for takeoff or landing.
Because weather is outside the airline's control, you are not owed compensation money under DOT rules. However, the airline must still rebook you on the next available flight at no extra charge. If the delay is long enough that you need food or lodging, check your airline's policy — some cover these costs for weather delays, and some do not. Ask the gate agent or call customer service to find out what your airline will pay for.
Military airspace closures and volcanic ash events fall into this same category. They are rare but do happen, and they are treated the same way as weather.
Mechanical failures and maintenance issues
If your flight was delayed or cancelled because of a mechanical problem with the aircraft, a broken seat, a faulty engine, or a maintenance issue discovered before takeoff, that is within the airline's control. Under DOT rules, you are owed compensation: $250 for delays of one to two hours, $400 for two to three hours, and $600 for delays over three hours (domestic flights). The airline must pay this even if they rebook you on another flight.
The airline may try to tell you the delay was for "safety reasons" or "maintenance." That is true, but it does not exempt them from paying you. Maintenance issues are still the airline's responsibility. Write down the specific problem if the agent mentions it — a cracked windshield, a hydraulic leak, a faulty landing gear sensor — because this helps if you need to file a complaint with the DOT later.
If the airline cancels the flight due to mechanical failure, you have the same compensation rights, plus the right to a refund of your ticket price if you choose not to rebook.
Crew scheduling and staffing shortages
When a flight is delayed or cancelled because the airline does not have a pilot or flight attendant available, that is within the airline's control. Crew members call in sick, miss connections, or hit legal limits on how many hours they can work in a day. The airline is responsible for scheduling enough crew to cover flights, so these delays trigger compensation.
You are owed the same amounts as mechanical delays: $250 to $600 depending on how long you were delayed. If the flight is cancelled, you can ask for a refund or rebook on another flight. The airline must pay compensation either way.
Staffing shortages have become more common since 2021, and many passengers have successfully filed DOT complaints for these delays. Keep records of what the airline told you — even if they said "crew unavailable" or "crew scheduling issue," that language is enough to support a compensation claim.
Overbooking and airline operational decisions
Overbooking happens when an airline sells more seats than the plane has, expecting some passengers to miss the flight. When everyone shows up, the airline asks for volunteers to take a later flight in exchange for compensation (usually a travel voucher or cash). If not enough people volunteer, the airline can involuntarily bump passengers.
If you are bumped involuntarily, you are owed compensation: $400 for delays of one to two hours and $800 for delays over two hours (domestic flights). The airline must also rebook you on the next available flight at no cost. This is separate from any ticket refund you may be owed.
Other operational decisions — like the airline deciding to cancel a flight to consolidate passengers onto another flight, or cancelling a flight because it was not full enough to be profitable — are also within the airline's control and trigger compensation rights.
Air traffic control delays and FAA decisions
Sometimes the FAA or air traffic control issues a ground stop or flow control program that delays all flights in a region. This might happen because of congestion at a major airport, a radar outage, or staffing issues at an air traffic control facility. These delays are outside the airline's control, so you are not owed compensation.
However, the airline must still rebook you on the next available flight at no extra cost. If the delay is several hours, ask whether the airline will cover meals or hotel. Some do and some do not, depending on their policy.
The difference between an air traffic delay and an airline operational delay can be hard to spot. If the airline says "air traffic control delay" or "FAA ground stop," that is outside their control. If they say "crew scheduling" or "mechanical," that is within their control. Ask the agent to be specific.
How to file a complaint if you disagree with the reason
If the airline gave you a reason you think is wrong, or if you believe they owe you compensation and refused to pay, you can file a complaint with the U.S. Department of Transportation. Go to the DOT Aviation Consumer Protection Division website and use their online complaint form. You will need your confirmation number, ticket number, the date of the flight, and a description of what happened.
Include any written communication from the airline — emails, text messages, or notes from what the agent told you. If you have a photo of a gate sign showing the reason for the delay, include that too. The DOT investigates complaints and can order airlines to pay compensation if they find the airline was wrong.
You do not need a lawyer to file a DOT complaint, and it does not cost anything. The process usually takes several weeks to several months. Keep copies of everything you send.
Frequently Asked Questions
Do I get money back if my flight was delayed but not cancelled?
You do not get a refund of your ticket price for a delay. However, if the delay was caused by something within the airline's control (mechanical failure, crew shortage, overbooking), you are owed compensation: $250 to $600 depending on how long you were delayed. This is separate from your ticket price.
What if the airline says it was weather but I saw clear skies?
Weather delays can happen at your destination airport, not just where you took off. They can also happen at a connecting airport. Ask the agent for the specific location and type of weather. If you still think they are wrong, file a DOT complaint and include what you observed. The DOT can request the airline's records and weather data to investigate.
Can I get a refund instead of being rebooked?
For a cancelled flight, yes — you can ask for a refund of your ticket price instead of rebooking. For a delay, the airline is only required to rebook you, not refund you. However, if the delay is very long (usually over 3 hours for domestic flights), some airlines will offer a refund as a courtesy. Ask the agent.
How long do I have to file a complaint with the DOT?
There is no strict important date, but the sooner you file the better. File within a few months of the flight while details are fresh and the airline's records are recent. The DOT can investigate complaints filed years later, but it is harder to gather evidence.
What if the airline refuses to tell me why the flight was delayed?
Ask to speak to a supervisor or call customer service the next day. Write down the date, time, and name of the agent who refused to tell you. If they still will not explain, file a DOT complaint and describe what happened. The DOT can request the airline's records and find out the real reason.