How reliable is John Glenn Columbus International Airport?
Flights from CMH departed within 15 minutes of schedule in 83% of 257,263 flights in official BTS 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 departure punctuality at CMH looks like
On-time departures
across 257,263 flights
Source: BTS Airport Operations · data through 2026-09-08. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
Weather by month
When the weather works for you at Columbus
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 · 96/100 favorability
Roughest month
Most disruptive — low visibility & fog, snow · 84/100 favorability
The read on CMH
What the numbers say about flying through John Glenn Columbus International Airport
Across official performance history, flights from Columbus left within 15 minutes of schedule about 83% of the time over 257,263 flights. That's a solid, better-than-average operational record. Pair it with a moderate cancellation rate of 1.9%. When a departure does run late, the typical delay is around 10 minutes.
On weather, Columbus is an unusually calm-weather airport year-round. September is the calmest stretch for flying, scoring 96 out of 100 for favorable conditions, while January is the most disruptive at 84, 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 Columbus, read how we weigh it all in how the Peace of Mind Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about CMH
- How reliable is John Glenn Columbus International Airport (CMH)?
- Flights from Columbus left within 15 minutes of schedule roughly 83% of the time across 257,263 flights of official history — a solid, better-than-average operational record. The cancellation rate runs about 1.9%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from CMH for good weather?
- September has the calmest flying weather at John Glenn Columbus International Airport. January is the most disruptive, mainly from low visibility & fog and snow.
Peace of Mind
Where to stay in Columbus
Hotels scored on cleanliness, location, price fairness, and trust — not just stars.
Reliability guides
Planning a trip through Columbus?
Score real flights to and from CMH on reliability, weather, and connection safety — not just price.
Opens a partner site; we may earn a commission if you book there. It's a general fare search — nothing on it is scored.