How reliable is Missoula International Airport?
Flights from MSO departed within 15 minutes of schedule in 85% of 33,135 flights in official BTS history — and weather is calmest in May. 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 MSO looks like
On-time departures
across 33,135 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
Advertisement
Weather by month
When the weather works for you at Missoula
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 · 67/100 favorability
The read on MSO
What the numbers say about flying through Missoula International Airport
Across official performance history, flights from Missoula left within 15 minutes of schedule about 85% of the time over 33,135 flights. That's one of the more dependable operational records you'll see. Pair it with a low cancellation rate of 1.0%, so flights here rarely vanish outright. When a departure does run late, the typical delay is around 11 minutes.
On weather, Missoula is an unusually calm-weather airport year-round. May is the calmest stretch for flying, scoring 97 out of 100 for favorable conditions, while January is the most disruptive at 67, 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 Missoula, 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 MSO
- How reliable is Missoula International Airport (MSO)?
- Flights from Missoula left within 15 minutes of schedule roughly 85% of the time across 33,135 flights of official history — one of the more dependable operational records you'll see. The cancellation rate runs about 1.0%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from MSO for good weather?
- May has the calmest flying weather at Missoula International Airport. January is the most disruptive, mainly from low visibility & fog and snow.
Planning a trip through Missoula?
Score real flights to and from MSO on reliability, weather, and connection safety — not just price.