How reliable is Sydney Kingsford Smith International Airport?
Flights from SYD avoided significant airline-controlled delay in 74% of 434,097 flights in official BITRE history — and weather is calmest in Apr. 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 SYD looks like
Avoided 15+ min controlled delay
across 434,097 flights
Source: BITRE. 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 Sydney (Mascot)
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 · 99/100 favorability
Roughest month
Most disruptive — low visibility & fog, thunderstorms · 96/100 favorability
Connecting through SYD
How much layover you really need
Allow at least this between domestic flights at SYD. Below it, one small delay risks a misconnect.
International transfers add immigration and bag recheck — give yourself this buffer at SYD or more.
PlaneSane connection-time estimate tuned for SYD's terminal layout. We score every connecting itinerary against conservative connection floors.
The read on SYD
What the numbers say about flying through Sydney Kingsford Smith International Airport
Across official performance history, flights from Sydney (Mascot) avoided significant airline-controlled delay about 74% of the time over 434,097 flights. That's a middling record — neither a strength nor a red flag on its own. Pair it with an elevated cancellation rate of 4.0% — worth weighing alongside the on-time figure. When a departure does run late, the typical delay is around 0 minutes.
On weather, Sydney (Mascot) is an unusually calm-weather airport year-round. April is the calmest stretch for flying, scoring 99 out of 100 for favorable conditions, while January is the most disruptive at 96, driven mainly by low visibility & fog and thunderstorms. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
If you're connecting through SYD, give yourself room. A domestic connection wants at least about 60 minutes, and international transfer wants roughly 90 minutes once immigration and a bag recheck are in the mix. Those are floors, not comfortable buffers — one inbound delay can erase them, so add margin when the connection matters.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Sydney (Mascot), 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 SYD
- How reliable is Sydney Kingsford Smith International Airport (SYD)?
- Flights from Sydney (Mascot) avoided significant airline-controlled delay roughly 74% of the time across 434,097 flights of official history — a middling record — neither a strength nor a red flag on its own. The cancellation rate runs about 4.0%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from SYD for good weather?
- April has the calmest flying weather at Sydney Kingsford Smith International Airport. January is the most disruptive, mainly from low visibility & fog and thunderstorms.
- How much layover time do you need at SYD?
- Allow at least about 60 minutes for a domestic connection and about 90 minutes for an international one as a floor. These are minimums, not comfortable buffers — a single inbound delay can wipe them out, so add margin when you can.
Planning a trip through Sydney (Mascot)?
Score real flights to and from SYD on reliability, weather, and connection safety — not just price.