Will My Flight Be Delayed? How to Gauge the Risk

Will My Flight Be Delayed? How to Gauge the Risk Before You Travel

There is no way to know for certain whether a flight will be delayed, but you can estimate the risk in advance: enter your flight number in the flight delay predictor and you’ll get an indicator built from real factors — air traffic control congestion, weather, route history, airline punctuality and strikes. FlightGuard does not promise an exact prediction for your individual flight, but it flags when conditions point to elevated risk, so you can plan ahead.

This guide explains how to read that risk before you travel. If your flight is already in the air and you want live status instead, the predictor still works — but this article is about awareness before you leave for the airport.

How Often Do Flights Depart Late?

To give a concrete benchmark, we tracked the real outcome of 10,970 flights (data through 26/06/2026). Here’s the overall picture:

In short: the vast majority of flights leave broadly on time, cancellations are rare (fewer than 6 flights in 1,000), and the “typical” delay is a matter of minutes. But the risk is not uniform — it depends heavily on the airline, the airport and the route. That’s why an indicator that weighs several factors together is more useful than a blanket average.

The Factors That Raise Delay Risk

When you enter a flight number, FlightGuard combines several real-world signals. None of them, on its own, “predicts” a delay — together they indicate whether conditions look benign or strained.

Air Traffic Control (ATC) Congestion

European airspace is among the busiest in the world. When traffic exceeds the capacity controllers can handle, EUROCONTROL imposes flow regulations (ATFM delays) that hold aircraft on the ground. As of 25/06/2026, the most congested European hubs include Rome Fiumicino, Lisbon, Athens, Zurich and Brussels. Departing from or arriving at one of these hubs raises the risk, especially in summer and at peak times. You can check a specific gateway such as Rome Fiumicino (FCO) or Milan Malpensa (MXP) on its dedicated page.

Weather

Fog, thunderstorms, snow and strong winds are frequent causes of delay. The bad weather doesn’t even need to hit your airport: it only has to affect a stop along the route or a connected hub to trigger a knock-on effect. FlightGuard uses OpenMeteo forecasts for both departure and arrival.

Route and Flight History

How this flight behaved over the preceding days, and how the route performs historically, are important signals. Some feeder legs into the big hubs accumulate higher average delays than others — in our sample, for example, Dublin–Amsterdam (DUB–AMS) shows roughly 19 minutes of average delay. Aircraft rotation matters too: a low-cost carrier running tight turnarounds can inherit a delay from an earlier leg.

Airline Punctuality

The carrier matters. The numbers below, derived from real tracked flights, show clear — sometimes counter-intuitive — differences.

One result that surprises people: in our sample, Ryanair (FR) cancels less (0.35%) than flag-carrier Lufthansa (0.94%), even though it runs slightly later than British Airways. And ITA Airways (AZ) cancelled none of its 263 sampled flights yet posted the highest share of flights delayed over 15 minutes (29.3%). Mind the small samples: for AZ the sample is around 260 flights, so read it as a signal, not a final verdict. For more detail, see the Ryanair (FR) page.

Strikes and Disruption

Strikes by cabin crew, ground handlers or air traffic controllers can cause mass cancellations at short notice — a recurring feature of European travel, particularly in France and Italy. FlightGuard monitors announced strikes and geopolitical tensions and folds them into the risk.

How to Read the Risk Indicator

The result is a score from 0 to 100 across three levels. It is not a probability that your specific flight will be late — it’s a summary of how benign or strained the conditions are:

• Low (green): no obvious critical factor; the flight should proceed normally.
• Medium (amber): a few things worth watching; keep an eye on it.
• High (red): several factors converge on meaningful risk; be ready for possible changes to your plans.

To give a sense of scale: we’ve computed over 1.67 million risk evaluations across 16,866 routes, with an average score of 13.7/100. Around 13.9% of evaluated flights fall into the high-risk band.

How to Use the Predictor in 3 Steps

1. Open the flight delay predictor and enter your flight number (e.g. BA590, FR79, AZ609).
2. Choose your travel date.
3. Read the risk indicator with the breakdown of the factors driving it.

There’s no sign-up and it’s free. If your flight is a few days away, you can set up an email alert: FlightGuard periodically recalculates the risk and lets you know if the situation changes significantly. Worried specifically about a cancellation? Use the flight cancellation risk checker, which focuses on the same factors through a cancellation lens.

If the Flight Really Is Delayed: Your Rights

If your flight arrives at its destination at least 3 hours late, Regulation (EC) No 261/2004 provides for cash compensation based on distance:

The right also applies to a cancellation with less than 14 days’ notice and to denied boarding through overbooking, unless extraordinary circumstances apply (extreme weather, airspace closure, an ATC strike, political instability). A strike by the airline’s own staff is generally not treated as extraordinary. Where rerouting limits the arrival delay, compensation may be reduced by 50% (Sturgeon/Nelson case law). The rules cover all departures from an EU airport on any airline, plus arrivals into the EU on an EU carrier. Claim deadlines vary by country — the UK allows 6 years, Ireland and most EU states less (Italy 2 years, Germany 3, Spain 5). For the full picture, read the guide to passenger rights under EU261.

In Summary

Knowing in advance whether your flight is at risk of delay lets you make better decisions: leave earlier, book an alternative, warn whoever is waiting for you. FlightGuard doesn’t offer a crystal ball — it turns real factors (ATC, weather, route history, punctuality, strikes) into one clear indicator.

Check your flight’s risk now and travel with fewer surprises.