How reliable is McCarran International Airport?
Flights from LAS departed within 15 minutes of schedule in 76% of 1,071,463 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 1,071,463 flights
Source: BTS Airport Operations · data through 2026-08-08. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
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 · 99/100 favorability
Connecting through LAS
How much layover you really need
Based on 102 sellable domestic itineraries seen through Google Flights. Median observed layover: 90 min.
Observed windows come from normalized SearchAPI / Google Flights itineraries. They are not official airport MCTs. We score every connecting itinerary against conservative connection floors.
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 76% of the time over 1,071,463 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 99, 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.
If you're connecting through LAS, give yourself room. Real itineraries sold through LAS bottom out around 45 minutes for a domestic connection. Those are floors, not comfortable buffers — one inbound delay can erase them, so add margin when the connection matters.
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 76% of the time across 1,071,463 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.
- How much layover time do you need at LAS?
- Allow at least about 45 minutes for a domestic connection as a floor. These are minimums, not comfortable buffers — a single inbound delay can wipe them out, so add margin when you can.
Reliability guides
Planning a trip through Las Vegas?
Score real flights to and from LAS on reliability, weather, and connection safety — not just price.