How reliable is Miami International Airport?
Flights from MIA departed within 15 minutes of schedule in 75% of 619,861 flights in official BTS history — and weather is calmest in Dec. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the departure punctuality at MIA looks like
On-time departures
across 619,861 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
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Weather by month
When the weather works for you at Miami
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 — thunderstorms, low visibility & fog · 93/100 favorability
Connecting through MIA
How much layover you really need
Allow at least this between domestic flights at MIA. Below it, one small delay risks a misconnect.
International transfers add immigration and bag recheck — give yourself this buffer at MIA or more.
PlaneSane connection-time estimate tuned for MIA's terminal layout. We score every connecting itinerary against conservative connection floors.
The read on MIA
What the numbers say about flying through Miami International Airport
Across official performance history, flights from Miami left within 15 minutes of schedule about 75% of the time over 619,861 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 17 minutes.
On weather, Miami is an unusually calm-weather airport year-round. December is the calmest stretch for flying, scoring 99 out of 100 for favorable conditions, while September is the most disruptive at 93, driven mainly by thunderstorms and low visibility & fog. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
If you're connecting through MIA, give yourself room. A domestic connection wants at least about 45 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 Miami, 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 MIA
- How reliable is Miami International Airport (MIA)?
- Flights from Miami left within 15 minutes of schedule roughly 75% of the time across 619,861 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 MIA for good weather?
- December has the calmest flying weather at Miami International Airport. September is the most disruptive, mainly from thunderstorms and low visibility & fog.
- How much layover time do you need at MIA?
- Allow at least about 45 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 Miami?
Score real flights to and from MIA on reliability, weather, and connection safety — not just price.