How to find out why your flight was cancelled

Amy Lancelotte

By:  Amy Lancelotte

20 minutes read

Last Updated:  July 17, 2026

Reviewed by:  Joanna Teljeur

To find out why your flight was cancelled, check the airline's app, website, and any text or email notice first, then confirm the cause with independent flight-status trackers (AirAdvisor, FlightAware, FlightRadar24) and your airport's website. Widespread cancellations are usually caused by weather, air traffic control (ATC) restrictions, or strikes, which often reach news and social media before the airline confirms them. Always cross-check the reason against at least two sources.

The cause is not just a detail. It decides whether you can claim up to £520 (€600) in compensation, so it is worth pinning down.

Whether you want to claim compensation for a cancelled flight or simply understand what happened, finding the reason behind a flight cancellation matters. Airlines are not always forthcoming with that information, particularly when the cause would entitle every affected passenger to compensation.

Below are the most reliable sources to check, in the order you should check them. We recommend verifying any reason against at least two sources, since the stated cause determines whether or not you have a valid compensation claim.

Ask your airline

Your airline should be the first to know that a flight is not going to take off, and why. Check at least one of the following right away.

Airline staff

If you are already at the airport and get word of a cancellation, speak to the gate agent and ask for the specific reason. Note it down and get the name of the person you spoke to. You may need this later to file a claim for the cancelled flight.

Airline website

Airlines often post about flight disruptions on their websites. The reason may be stated there, and if not, you can contact the airline directly by phone or live chat to confirm.

You can also use an airline's online system to check for cancellations and associated causes. If you have a login, use it to look up your flight. Downloading the airline's app for push notifications is also worth doing before you travel.

Airline communication

Most airlines have a system in place to notify customers of a flight cancellation. When you book, specify a preferred contact method you can check easily. A cancellation notification can include the reason and may arrive by text, email, or phone.

Check your airport

When an airport is experiencing an unusually high number of flight disruptions, it will often post about it on its official website. The reason will be clearly stated and is most commonly due to weather or staffing issues, including strikes and air traffic control (ATC) restrictions.

Try flight-tracking websites

Independent flight tracking sites can tell you whether your flight has been cancelled, though rarely why. If you're not using an app with push notifications, check your status before you leave for the airport.

AirAdvisor's flight disruption tracker pulls flight data from multiple reliable sources and updates it every 1–2 hours, making it one of the more current sources available. Flightstats, FlightRadar24, and FlightAware are also reliable. Google works if you have your flight number and need a quick confirmation, but it won't tell you what caused the disruption.

Flight-tracking sites are most useful for seeing what planes are in the air at any given time. Look for planes circling your departure airport, which can indicate air traffic control issues that ripple through and cause cancellations further down the schedule. A plane sitting for an extended time at a previous destination can indicate a security issue, a mechanical problem, or a crew shortage.

You may not always be able to confirm the exact reason from a tracker, but you can make reasonable assumptions. These are useful when an airline is being vague about why a cancellation occurred. Partnering with AirAdvisor to make a claim can then help establish the cause formally, putting your passenger rights into action.

Social media and news outlets

When flights are cancelled because of large-scale events such as airport staff or air traffic control strikes, severe weather, or widespread technical issues, the story often breaks on news and social media before the airline notifies affected passengers.

Following your frequently-used airlines and major news channels (BBC, Reuters, Bloomberg) means that when a story about large-scale cancellations is reported, the airline will have difficulty denying or obscuring the cause.

Check official ATC and weather sources

When a cancellation is blamed on air traffic control or weather, you can confirm it independently from the authorities that actually manage the airspace. These sources are neutral, timestamped, and hard for an airline to contradict later.

• US airspace: the FAA's National Airspace System Status shows live ground stops, ground delay programs, and the airports affected, refreshed every few minutes.
• European airspace: Eurocontrol's public Network Operations Portal publishes the current network situation and the flow restrictions (ATC capacity, staffing, weather) causing delays across Europe.
• Weather: aviation weather reports (METARs and TAFs) and your national weather service show whether conditions at the airport were genuinely severe at the time, or mild enough to question a "weather" excuse.

If none of these show a restriction or severe weather at your departure airport when your flight was cancelled, a "weather" or "ATC" explanation is worth challenging.

Find the airline's official reason with delay codes

Airlines log a standardised reason for every disrupted flight using IATA delay codes, a numbered system that assigns the cause. You rarely see the code on your booking, but knowing the categories helps you read a vague explanation, and each family points towards whether compensation is likely.

Code 9x is the one to watch: a knock-on cancellation is only extraordinary if the delay that started the chain was extraordinary. If your flight was cancelled because the aircraft arrived late after a crew shortage on its previous rotation, that root cause is the airline's responsibility.

How to see the code or official remark

Some airlines show the reason directly. United, for example, states it at the top of the flight details in its app. For other carriers, a paid ExpertFlyer subscription (around $10 a month) can reveal the airline's operational remarks: log in, open Flight Status, enter your flight, and select View additional comments. Coverage varies by airline and the data is usually only available for flights within about a week, so check soon after the disruption.

If you cannot find the code, ask the airline in writing for the specific reason. A refusal, or a vague "operational reasons" reply, is itself useful evidence when you claim.

How to get ahead of a cancelled flight

Knowing the reason as early as possible gives you more options, including the chance to re-book before other passengers do. Two tools are worth having set up before you fly.

Google Flights

Since 2018, Google Flights in conjunction with Google Assistant has been able to alert users to flight disruptions, sometimes hours before the official communication from the airline. When multiple flights from the same airport are cancelled simultaneously, acting quickly on that lead time can make a real difference to how long you end up stranded.

Airline apps

Download your airline's app before you travel and enable push notifications. Many airlines use their apps as the first point of contact for customers, which means you may receive word of a cancellation before other passengers who have not downloaded it.

Common reasons why flights get cancelled

The reasons for flight cancellations are varied. The most common include:

• Extreme weather. Conditions that make it unsafe to operate.
• Air traffic control restrictions. ATC can limit how many flights can take off or land within a given period.
• Industrial action. Strikes by airline staff, ATC workers, baggage handlers, or ground crews can cancel flights quickly and at scale.
• Economics. Some airlines will cancel a flight if not enough seats have been sold to make the route viable.
• Aircraft issues. Mechanical problems, manufacturing defects, damage from a previous flight (including bird or lightning strikes), or a plane stranded at another airport.

Why the cancellation reason matters for your claim

Under EU261 and UK261, airlines are required to compensate passengers for cancellations that were within their control. If the reason falls into the category of extraordinary circumstances such as genuine extreme weather, political instability, or third-party ATC strikes, compensation may not be owed. But for the majority of cancellations caused by operational issues, staffing problems, or aircraft faults, passengers are entitled to up to £520 (€600) per person.

This is why establishing the real cause matters. Airlines sometimes state a reason that sounds like an extraordinary circumstance when the underlying cause is actually operational. If a reason seems vague or inconsistent with what you observed, it is worth investigating further and submitting a claim regardless.

Outside the EU and UK the same principle applies under different rules. In the US, the Department of Transportation splits cancellations into "controllable" (maintenance, crew scheduling, cabin cleaning, fuelling and baggage loading) and "uncontrollable" (weather, air traffic control, security). There is no automatic cash compensation, but if your flight is cancelled you are entitled to a full refund when you choose not to travel, and airlines must rebook you and cover meals or hotels for cancellations within their control.

What to do once you know the reason

Knowing why your flight was cancelled is the starting point, not the end point. If the reason was within the airline's control, you may be entitled to compensation. Here is what to do next:

1. Save your boarding pass and booking confirmation.
2. Note your actual arrival time at your final destination.
3. Get the cancellation reason in writing if you can.
4. Check your eligibility using AirAdvisor's cancelled flight compensation guide.
5. Submit your claim, either directly to the airline or through AirAdvisor on a no win, no fee basis.

For UK-departing flights, you have up to 6 years to submit a claim. For EU departures, the window is typically 2–3 years.

Frequently asked questions

What if the airline refuses to tell me why my flight was cancelled?

You are legally entitled to a reason. Ask in writing and keep a record of the response, or lack of one. If the airline withholds the reason or gives a vague explanation like "operational reasons," AirAdvisor can investigate on your behalf as part of the claims process. A pattern of vague responses is itself a useful indicator that the cause may be one the airline would rather not disclose.

Does the reason for cancellation affect whether I can claim?

Yes. Compensation under EU261 and UK261 is not owed if the cancellation was caused by extraordinary circumstances that the airline could not have avoided, such as genuine extreme weather or a third-party ATC strike. If the cause was operational (crew shortage, aircraft fault, scheduling issue), compensation is generally owed. This is why establishing the actual reason is so important.

How long do I have to claim compensation for a cancelled flight?

For flights departing from the UK, you have up to 6 years to submit a compensation claim. For EU-departing flights, the window is typically 2–3 years, depending on the country of departure. If you are unsure, submit your details to AirAdvisor and we will confirm whether you are still within the claim window.

Can I see the IATA delay code for my flight?

Not usually on your booking. Airlines record a delay code internally, and some, such as United, display the reason in their app. Otherwise a paid tool like ExpertFlyer can show the airline's operational remarks, or you can request the specific reason in writing. The code family tells you whether the cause was within the airline's control.

Do these rules apply to flights in the US?

US flights are covered by Department of Transportation rules rather than EU261 or UK261. There is no fixed cash compensation, but if your flight is cancelled you are entitled to a full refund when you choose not to travel, and airlines must rebook you and cover meals or hotels for cancellations within their control.

Can I claim if I was not told about the cancellation until I arrived at the airport?

Yes. Being told about a cancellation at the airport, rather than in advance, can actually strengthen your claim. Under EU261 and UK261, if an airline cancels with fewer than 14 days' notice and cannot offer a suitable alternative flight, you may be entitled to both compensation and a full refund.

Disclaimer: The screenshots and user interface designs featured in this article are illustrative mockups created for educational and demonstration purposes. Brand names, logos, flight numbers, and interfaces (including SkyTrack, Skyscanner, Google Flights, and British Airways) are used conceptually to simulate real-world scenarios and do not represent actual real-time flight data, live system notifications, or official endorsements by the respective companies.

Author:

Amy Lancelotte

Job/Position: Senior Writer & Content Strategist

Amy Lancelotte is a Senior Content Writer and editorial contributor at AirAdvisor with over seven years of experience producing research-based articles for international audiences. Her work focuses on travel, aviation, and air passenger rights, with an emphasis on factual accuracy, verified data, and clear, reader-first explanations.

• 

No feedback