Cheap flights from Las Vegas to St. Louis from $91

In general, December is the cheapest month to fly from Las Vegas to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $193. The month of April is another great option to travel to St. Louis, with average flight prices from Las Vegas averaging around $263.

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $296. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $498. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

Flying to St. Louis from Las Vegas in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $205 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $398 per ticket.

Fly from Las Vegas Harry Reid Intl to Lambert-St Louis for the best Las Vegas Harry Reid Intl - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from Las Vegas when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $322 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Las Vegas for as low as $221 on momondo.

There are 3 cabin classes available to choose from on Las Vegas to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier and Southwest are the most popular carriers operating from Las Vegas Harry Reid Intl to Lambert-St Louis

Frontier, Southwest and American Airlines are the top three most popular airlines that fly to St. Louis from Las Vegas according to our data. Frontier is the first choice among our users, with 76% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

5 flights are operational daily from Las Vegas to St. Louis as of November 2026. The most popular departure time for this route is 11:00AM, with 59% of flights per day taking off at noon.

35 flights are operational weekly from Las Vegas to St. Louis as of November 2026. The most popular departure day for this route is Sun, with 26% of flights per week taking off on this day.