How reliable is McCarran International Airport?
Flights from LAS departed within 15 minutes of schedule in 77% of 1,056,739 flights in official BTS history — and weather is calmest in Dec. 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 LAS looks like
On-time departures
across 1,056,739 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 Las Vegas
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 · 100/100 favorability
Roughest month
Most disruptive — thunderstorms, high winds · 98/100 favorability
The read on LAS
What the numbers say about flying through McCarran International Airport
Across official performance history, flights from Las Vegas left within 15 minutes of schedule about 77% of the time over 1,056,739 flights. That's a respectable but unspectacular operational record. Pair it with a low cancellation rate of 1.1%, so flights here rarely vanish outright. When a departure does run late, the typical delay is around 13 minutes.
On weather, Las Vegas is an unusually calm-weather airport year-round. December is the calmest stretch for flying, scoring 100 out of 100 for favorable conditions, while July is the most disruptive at 98, driven mainly by thunderstorms and high winds. 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 Las Vegas, 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 LAS
- How reliable is McCarran International Airport (LAS)?
- Flights from Las Vegas left within 15 minutes of schedule roughly 77% of the time across 1,056,739 flights of official history — a respectable but unspectacular operational record. The cancellation rate runs about 1.1%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from LAS for good weather?
- December has the calmest flying weather at McCarran International Airport. July is the most disruptive, mainly from thunderstorms and high winds.
Planning a trip through Las Vegas?
Score real flights to and from LAS on reliability, weather, and connection safety — not just price.