How reliable is Harrisburg International Airport?
Flights from MDT departed within 15 minutes of schedule in 83% of 57,172 flights in official BTS history — and weather is calmest in Aug. 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 MDT looks like
On-time departures
across 57,172 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 Harrisburg
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, snow · 79/100 favorability
The read on MDT
What the numbers say about flying through Harrisburg International Airport
Across official performance history, flights from Harrisburg left within 15 minutes of schedule about 83% of the time over 57,172 flights. That's a solid, better-than-average operational record. Pair it with a moderate cancellation rate of 1.6%. When a departure does run late, the typical delay is around 11 minutes.
On weather, Harrisburg is an unusually calm-weather airport year-round. August is the calmest stretch for flying, scoring 95 out of 100 for favorable conditions, while December is the most disruptive at 79, driven mainly by low visibility & fog and snow. 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 Harrisburg, 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 MDT
- How reliable is Harrisburg International Airport (MDT)?
- Flights from Harrisburg left within 15 minutes of schedule roughly 83% of the time across 57,172 flights of official history — a solid, better-than-average operational record. The cancellation rate runs about 1.6%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from MDT for good weather?
- August has the calmest flying weather at Harrisburg International Airport. December is the most disruptive, mainly from low visibility & fog and snow.
Planning a trip through Harrisburg?
Score real flights to and from MDT on reliability, weather, and connection safety — not just price.