How reliable is Glasgow?
Flights from GLA avoided significant airline-controlled delay in 75% of 208,446 flights in official UK CAA history — and weather is calmest in Jun. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the airline-controlled delay record at GLA looks like
Avoided 15+ min controlled delay
across 208,446 flights
Source: UK CAA. Origin-grouped, cause-attributed operational history; it is not a direct departure-punctuality measure or a guarantee for any flight.
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Weather by month
When the weather works for you at Glasgow
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 98/100 favorability
Roughest month
Most disruptive — low visibility & fog, freezing conditions · 89/100 favorability
The read on GLA
What the numbers say about flying through Glasgow
Across official performance history, flights from Glasgow avoided significant airline-controlled delay about 75% of the time over 208,446 flights. That's a respectable but unspectacular operational record. Pair it with a moderate cancellation rate of 1.8%. When a departure does run late, the typical delay is around 14 minutes.
On weather, Glasgow is an unusually calm-weather airport year-round. June is the calmest stretch for flying, scoring 98 out of 100 for favorable conditions, while December is the most disruptive at 89, driven mainly by low visibility & fog and freezing conditions. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Glasgow, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about GLA
- How reliable is Glasgow (GLA)?
- Flights from Glasgow avoided significant airline-controlled delay roughly 75% of the time across 208,446 flights of official history — a respectable but unspectacular operational record. The cancellation rate runs about 1.8%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from GLA for good weather?
- June has the calmest flying weather at Glasgow. December is the most disruptive, mainly from low visibility & fog and freezing conditions.
Planning a trip through Glasgow?
Score real flights to and from GLA on reliability, weather, and connection safety — not just price.