How reliable is São Paulo/Guarulhos–Governor André Franco Montoro International Airport?
Flights from GRU avoided significant airline-controlled delay in 79% of 591,285 flights in official ANAC 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 GRU looks like
Avoided 15+ min controlled delay
across 591,285 flights
Source: ANAC VRA · data through 2026-06-25. 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 São Paulo
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 · 95/100 favorability
Roughest month
Most disruptive — low visibility & fog, thunderstorms · 90/100 favorability
Connecting through GRU
How much layover you really need
Allow at least this between domestic flights at GRU. Below it, one small delay risks a misconnect.
International transfers add immigration and bag recheck — give yourself this buffer at GRU or more.
PlaneSane connection-time estimate tuned for GRU's terminal layout. We score every connecting itinerary against conservative connection floors.
The read on GRU
What the numbers say about flying through São Paulo/Guarulhos–Governor André Franco Montoro International Airport
Across official performance history, flights from São Paulo avoided significant airline-controlled delay about 79% of the time over 591,285 flights. That's a respectable but unspectacular operational record. Pair it with a moderate cancellation rate of 1.3%. When a departure does run late, the typical delay is around 6 minutes.
On weather, São Paulo is an unusually calm-weather airport year-round. April is the calmest stretch for flying, scoring 95 out of 100 for favorable conditions, while October is the most disruptive at 90, 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 GRU, 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 São Paulo, 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 GRU
- How reliable is São Paulo/Guarulhos–Governor André Franco Montoro International Airport (GRU)?
- Flights from São Paulo avoided significant airline-controlled delay roughly 79% of the time across 591,285 flights of official history — a respectable but unspectacular operational record. The cancellation rate runs about 1.3%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from GRU for good weather?
- April has the calmest flying weather at São Paulo/Guarulhos–Governor André Franco Montoro International Airport. October is the most disruptive, mainly from low visibility & fog and thunderstorms.
- How much layover time do you need at GRU?
- 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 São Paulo?
Score real flights to and from GRU on reliability, weather, and connection safety — not just price.