How to know if your flight will be delayed: the complete guide
You have a flight booked and you’re wondering if it will arrive on time? You’re not alone. Every day thousands of flights across Europe experience delays or cancellations, and the uncertainty can turn a trip into a stressful experience. The good news is that today tools like FlightGuard let you assess the risk of delay for your flight before you even get to the airport.
In this guide we’ll look at why flights get delayed, how FlightGuard’s risk analysis works, and what you can do to be better prepared.
Why flights get delayed
There are many causes of flight delays, and they often combine with each other. Here are the main ones:
Adverse weather
Fog, thunderstorms, snow and strong winds are among the most frequent causes of delay. The bad weather doesn’t even need to hit your airport: it’s enough for it to affect one of the airports along the route or a connected hub to trigger a domino effect across dozens of flights.
Air traffic congestion (ATC)
European airspace is among the busiest in the world. When traffic volume exceeds the capacity of air traffic controllers, EUROCONTROL imposes regulations (called ATFM delays) that can keep your flight grounded for minutes or hours.
Strikes
Strikes by flight crew, airport ground handlers or air traffic controllers are unfortunately frequent, especially in some European countries. They can cause mass cancellations with little warning.
Technical and operational problems
Aircraft malfunctions, boarding delays, crew changes or a late-arriving aircraft from a previous flight are common causes. Low-cost carriers, which operate with very tight turnaround times, are particularly vulnerable.
NOTAMs and airport restrictions
NOTAMs (Notice to Air Missions) flag temporary runway closures, ongoing works or operational restrictions that can reduce an airport’s capacity and cause delays.
How FlightGuard analyses the risk of your flight
FlightGuard doesn’t just show you real-time flight status. It does something more useful: it assesses the risk of delay or cancellation before it happens, analysing 10 different factors and assigning a score from 0 to 100.
The 10 risk factors
Here’s what FlightGuard analyses for each flight:
- Flight trend (weight 18%) — Recent pattern of flights with the same number
- Route history (weight 18%) — Historical performance of the same route in recent months
- Time of day & weekday (weight 15%) — Delays build through the day and cluster on Fridays and Sundays
- Airline punctuality (weight 14%) — The carrier’s delay and cancellation record
- ATC delays (weight 10%) — EUROCONTROL air traffic control data
- Strikes (weight 10%) — Pilot, ground-handler or controller strikes
- Weather (weight 9%) — Wind, precipitation and visibility at destination
- NOTAMs (weight 2%) — Runway and airspace notices
- Fuel (weight 2%) — Jet fuel price and supply
- Geopolitics (weight 2%) — Closed airspaces, conflicts, restrictions
All this data is continuously updated through an ETL system that collects information from public and institutional sources.
The risk score
The result is a risk score from 0 to 100 divided into three levels:
- Score < 15 — Low risk (green): the flight should proceed without problems
- Score 15-34 — Medium risk (yellow): there are some factors to watch, worth monitoring
- Score >= 35 — High risk (red): significant risk of delay or cancellation, be prepared for possible schedule changes
How to use FlightGuard in 3 steps
Checking the risk of your flight is very simple:
- Go to FlightGuard and enter your flight number (e.g. FR1234, AZ609, U28543)
- Choose the date of your trip
- Get the risk score with a detailed explanation of the factors that influence it
No account needed and the service is completely free.
Want to stay updated?
If your flight is a few days away, you can activate a free email alert. FlightGuard will periodically recalculate the risk and notify you by email if the situation changes significantly. So you don’t have to check manually every day.
When to worry (and when not to)
Not all risk factors have the same impact. Here are some practical rules:
- Weather: check the forecast 2-3 days before. A storm forecast a week away might not materialise
- Strikes: if a strike has been announced, the risk is real. Check if your airline has published a list of guaranteed flights
- ATC: air traffic delays are more frequent in summer and during peak hours (morning and late afternoon)
- Airline punctuality: some airlines consistently have lower punctuality rates
Also check the airport
The risk doesn’t depend only on the airline or the weather, but also on the airport. Some European airports are known for more frequent delays due to congestion or limited infrastructure. You can check the dedicated pages for individual airports for a complete picture.
Conclusion
Knowing in advance if your flight is at risk of delay allows you to make better decisions: leave earlier for the airport, book an alternative flight, let people at your destination know. FlightGuard gives you this information simply and for free.
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Check the risk of your flight now and travel with fewer surprises.
