Cheap flights from Illinois to Las Vegas from $71

The month of January is, on average, the cheapest month to fly to Las Vegas from Illinois, with most prices found around $251. The month of November is another great option to travel to Las Vegas, with average flight prices from Illinois averaging around $289.

Our data shows that Sunday is the least expensive day to fly to Las Vegas. Tickets to fly out on this day can be as low as $291. Flights from Illinois to Las Vegas on a Friday will generally be more expensive and average around $377. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

The cheapest time of day to fly to Las Vegas is in the evening when flights can be purchased for as low as $272. Flights to Las Vegas are more costly in the afternoon, with an average ticket price of $364. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Belleville to Las Vegas Harry Reid Intl for the best Illinois - Las Vegas Harry Reid Intl flight prices

You are more likely to see cheaper flights to Las Vegas from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Las Vegas for around $330 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Las Vegas from Illinois for as low as $288 on momondo.

There are 4 cabin classes available to choose from on Illinois to Las Vegas flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Allegiant Air, Alaska Airlines, and Frontier are the most popular carriers operating from Illinois to Las Vegas Harry Reid Intl

United Airlines, Allegiant Air and American Airlines are the top three most popular airlines that fly to Las Vegas from Illinois according to our data. United Airlines is the first choice among our users, with 30% of people opting to fly with this airline when traveling to Las Vegas. Keep in mind that there are 8 different airlines that fly to Las Vegas on a routine basis, so you have a few additional options to choose from.

As of September 2026, there are 45 flights per day flying from Illinois to Las Vegas. The most common time of day flights depart is 9:00PM, with 45% of flights taking off in the evening.

321 flights are operational weekly from Illinois to Las Vegas as of September 2026. The most popular departure day for this route is Thu, with 19% of flights per week taking off on this day.