$73 Cheap American Airlines flights St. Louis (STL) to Las Vegas (LAS)

You’ll find budget-friendly return American Airlines flights from $145 from STL to LAS by filtering your results from “Price (lowest to highest)” on Expedia. Or look for options from $73 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

American Airlines flights to Las Vegas are often cheaper in the off-peak months of January and June. Whether you’re after a one-way or round-trip ticket, you could score a better deal then.

Begin your search one to three months before your departure to find cheaper fares on American Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Harry Reid Intl. Airport (LAS). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Use our “Nonstop” filter when searching for direct American Airlines flights from STL to LAS. It’s also a great way to compare other airlines servicing the same nonstop trip.

Find American Airlines’s earliest flights from STL to LAS by selecting our “Morning” and “Early Morning” filters. Not only will you arrive at your destination sooner, early departures also have a 20% less chance of being canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

American Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Las Vegas arrive at Harry Reid Intl. Airport (LAS). This is the main entry point to this destination.

Changes are typically free within 24 hours of making a booking, but your airline may charge a fee after that time. For more information about altering your reservation, go to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to adjust your plans without additional costs, tick the “Changes included” and “No cancel fee” filters when planning your next trip.