How reliable is Santarém - Maestro Wilson Fonseca International Airport?
Flights from STM avoided significant airline-controlled delay in 91% of 12,867 flights in official ANAC history — and weather is calmest in Sep. 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 STM looks like
Avoided 15+ min controlled delay
across 12,867 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 Santarém
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 · 91/100 favorability
The read on STM
What the numbers say about flying through Santarém - Maestro Wilson Fonseca International Airport
Across official performance history, flights from Santarém avoided significant airline-controlled delay about 91% of the time over 12,867 flights. That's one of the more dependable operational records you'll see. Pair it with an elevated cancellation rate of 2.9% — worth weighing alongside the on-time figure. When a departure does run late, the typical delay is around -3 minutes.
On weather, Santarém is an unusually calm-weather airport year-round. September is the calmest stretch for flying, scoring 99 out of 100 for favorable conditions, while November is the most disruptive at 91, 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.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Santarém, 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 STM
- How reliable is Santarém - Maestro Wilson Fonseca International Airport (STM)?
- Flights from Santarém avoided significant airline-controlled delay roughly 91% of the time across 12,867 flights of official history — one of the more dependable operational records you'll see. The cancellation rate runs about 2.9%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from STM for good weather?
- September has the calmest flying weather at Santarém - Maestro Wilson Fonseca International Airport. November is the most disruptive, mainly from low visibility & fog and thunderstorms.
Planning a trip through Santarém?
Score real flights to and from STM on reliability, weather, and connection safety — not just price.