If you are travelling to Vegas during the peak season, then the average cost for two would cost around $3570. However, if you would opt for the off season trip during the months of January, February, April, and September, then the cost may drop down drastically for you and your companion traveler.
Besides, you can also opt for the round-trip while flights to Las Vegas to make your travel plans better. In addition, try to hit the nearest airport in the city to arrive as this also helps you to find the best fares.