How reliable is London International Airport?
Month-by-month weather risk and connection guidance for London International Airport. We don’t yet have on-time performance history here — see why below.
Weather favorability
year-round climate
On-time performance data isn’t available for YXU yet
Our historical on-time and cancellation record currently covers the US, UK, Brazil, and Australia, so we don’t score departure reliability at London International Airport yet. Weather climatology below comes from global airport observations and still applies.
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Weather by month
When the weather works for you at London
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 · 92/100 favorability
Roughest month
Most disruptive — snow, low visibility & fog · 69/100 favorability
The read on YXU
What the numbers say about flying through London International Airport
PlaneSane doesn't yet have on-time and cancellation history for London International Airport, so it isn't scored for departure reliability here — that record currently covers the US, UK, Brazil, and Australia. The weather and connection context below comes from separate global sources and still applies.
On weather, London is an unusually calm-weather airport year-round. June is the calmest stretch for flying, scoring 92 out of 100 for favorable conditions, while January is the most disruptive at 69, driven mainly by snow and low visibility & fog. The seasonal swing is real but manageable; favor the calmer months when your dates are flexible.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to London, 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 YXU
- What is the best month to fly from YXU for good weather?
- June has the calmest flying weather at London International Airport. January is the most disruptive, mainly from snow and low visibility & fog.
Planning a trip through London?
Score real flights to and from YXU on reliability, weather, and connection safety — not just price.