How reliable is Great Falls International Airport?
Flights from GTF departed within 15 minutes of schedule in 89% of 16,538 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 GTF looks like
On-time departures
across 16,538 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 Great Falls
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 · 97/100 favorability
Roughest month
Most disruptive — low visibility & fog, snow · 79/100 favorability
The read on GTF
What the numbers say about flying through Great Falls International Airport
Across official performance history, flights from Great Falls left within 15 minutes of schedule about 89% of the time over 16,538 flights. That's one of the more dependable operational records you'll see. Pair it with a low cancellation rate of 0.7%, so flights here rarely vanish outright. When a departure does run late, the typical delay is around 5 minutes.
On weather, Great Falls is an unusually calm-weather airport year-round. July is the calmest stretch for flying, scoring 97 out of 100 for favorable conditions, while February is the most disruptive at 79, 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 Great Falls, 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 GTF
- How reliable is Great Falls International Airport (GTF)?
- Flights from Great Falls left within 15 minutes of schedule roughly 89% of the time across 16,538 flights of official history — one of the more dependable operational records you'll see. The cancellation rate runs about 0.7%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from GTF for good weather?
- July has the calmest flying weather at Great Falls International Airport. February is the most disruptive, mainly from low visibility & fog and snow.
Planning a trip through Great Falls?
Score real flights to and from GTF on reliability, weather, and connection safety — not just price.