Cancelled vs. Delayed Flight: What's the Difference?

A delayed flight still operates — it just arrives 15 minutes or more late. A cancelled flight does not operate at all. The two are counted and handled differently, and mixing them up leads to a lot of confusion about airline reliability.

Delayed: it still flies

A delay means the flight completes, only later than scheduled. Under the 15-minute rule, any arrival 15+ minutes behind schedule is a delay. The flight number, the aircraft, and your seat all still exist.

Cancelled: it doesn't fly

A cancellation means the scheduled flight is called off entirely and you must be rebooked. Nationally about 1.6% of flights are cancelled, though that spikes in winter storms and summer thunderstorms.

How the statistics treat each

Because a cancelled flight has no arrival time, it can't have an arrival delay — so cancellations are excluded from delay averages and reported separately. Diversions (landing somewhere other than the destination) are handled the same way. Our methodology page spells this out.

Frequently asked questions

Which is more common, delays or cancellations?

Delays, by far. About one flight in five is delayed; only about 1–2% are cancelled.

Does a long delay become a cancellation?

Not automatically. A flight can be hours late and still count as a (very) delayed completed flight. It's a cancellation only if the airline formally cancels it.