Not usually required for citizens of Canada or the 37 Visa Waiver Program countries with ESTA pre-authorization.
Despite being in the middle of a desert, Las Vegas is a surprisingly easy city to reach, with the majority of visitors arriving by road or air.
Las Vegas is a great road-trip destination, but in the desert, vehicles may overheat when outside temperatures top 90°F. If you're driving here on a hot day, watch your air-con usage to avoid overheating the engine. By car it's about a four-hour drive (265 miles) from Los Angeles, five hours (330 miles) from San Diego and 8½ hours (570 miles) from San Francisco. Expect long delays on weekends and holidays.
Landing in Las Vegas by plane is often easier, not to mention more scenic if you happen to have a window seat as you descend into the city past the neon-lit Strip. Vegas is served by McCarran International Airport, near the south end of the Strip, and a couple of smaller general aviation facilities around the city.
Flights, cars and tours can be booked online at www.lonelyplanet.com/bookings.