If you are leaving the bright lights of Vegas from the strip area you don't need to worry about a long journey as the airport is very close. One of the main factors determining how long the wait at security will be is what day you are flying out of Harry Reid Airport. There is an awful lot of people leaving Las Vegas on a Sunday and that will often be the busiest day at the airport. Vegas often scores badly in surveys about TSA wait times though those results can be skewed by day of the week and seasonality.
Check above for the current estimated Las Vegas TSA wait times and PreCheck locations and lane openings. TSA PreCheck membership can lead to much shorter wait times at LAS. To find out more about joining or renewing TSA PreCheck membership visit https://www.tsa.gov/precheck. Please note that CLEAR is also available at Harry Reid Airport.
The feedback we have received about immigration at Las Vegas Airport is that people have been processed relatively quickly, however as with departures, once again day of the week can make a big difference. Mid week arrivals will be smoother. The biggest factor affecting security wait times for international arrivals is whether your flight landing at Vegas is direct or if you have connected elsewhere in the US and already passed customs inspection.
To find out more about the Harry Reid Airport wait times, TSA security checks, carry on bag screening, useful apps and more visit https://www.mccarran.com/