How reliable is Duluth International Airport?
Flights from DLH departed within 15 minutes of schedule in 83% of 14,447 flights in official BTS history — and weather is calmest in Jul. 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 DLH looks like
On-time departures
across 14,447 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 Duluth
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 · 90/100 favorability
Roughest month
Most disruptive — low visibility & fog, snow · 65/100 favorability
The read on DLH
What the numbers say about flying through Duluth International Airport
Across official performance history, flights from Duluth left within 15 minutes of schedule about 83% of the time over 14,447 flights. That's a solid, better-than-average operational record. Pair it with a moderate cancellation rate of 2.1%. When a departure does run late, the typical delay is around 15 minutes.
On weather, Duluth is a generally calm-weather airport, with a rougher stretch to watch. July is the calmest stretch for flying, scoring 90 out of 100 for favorable conditions, while December is the most disruptive at 65, driven mainly by low visibility & fog and snow. The seasonal swing is real but manageable; favor the calmer months when your dates are flexible.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Duluth, 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 DLH
- How reliable is Duluth International Airport (DLH)?
- Flights from Duluth left within 15 minutes of schedule roughly 83% of the time across 14,447 flights of official history — a solid, better-than-average operational record. The cancellation rate runs about 2.1%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from DLH for good weather?
- July has the calmest flying weather at Duluth International Airport. December is the most disruptive, mainly from low visibility & fog and snow.
Planning a trip through Duluth?
Score real flights to and from DLH on reliability, weather, and connection safety — not just price.